Axichrom 1400
Low-pressure chromatography columns, in sizes 300 to 1600 mm internal diameter (i.d.), offer automated column packing for process development or manufacturing. Preprogrammed packing methods improve accuracy and ease of use.
FAQ
There are several ways of arranging flow paths to by-pass the column. One is described below.
Fit the columns with one 4-port, 4-way valve at the column inlet and two 4-port, 4-way valves at the column outlet.
AxiChrom 50, 70 and 100 columns
AxiChrom 50, 70 and 100 columns User Manual
AxiChrom 50, 70 and 100 columns Unpacking instructions
General specifications
Assembly drawings
Production records
Certificate of conformance
Material certificates
AxiChrom 140 and 200 columns
AxiChrom 140 and 200 columns User Manual
AxiChrom 140 and 200 columns Unpacking instructions
General specifications
Assembly drawings
Production records
Certificate of conformance
Spare part list
Material certificates
AxiChrom 300-1000 columns
The following documentation is provided with AxiChrom 300, 400, 450, 600, 800 and 1000 columns:
General specification
Assembly drawings
Spare part list
Production records
Material conformity
Material certificates
AxiChrom columns Site Preparation Guide—guidelines and requirements regarding the installation site and how to place the column.
Product documentation—delivered on a CD. Can be ordered as printed material in binders on request. Contains spare part lists, diagrams, USP Class VI and material certificates, etc.
Packing recommendations, applications and Sanitization-In-Place studies, and other supporting documentation.
Release of product
EC Declaration of conformity in conformity with the following normative harmonized standards;
EN 61326-1 Electrical equipment for measurement, control, and laboratory use- EMC requirements
EN ISO 12100 Safety of machinery. General principles for design. Risk assessment and risk reduction
Technical principles following the provisions of EC Directive(s);
2004/108/EC Electromagnetic Compatibility (EMC-Directive)
2006/95/EC Low Voltage Directive (LVD)
2006/42/EC Machinery Directive (MD)
97/23/EC Pressure Equipment Directive (PED)
Instructions and User manuals delivered with the products:
AxiChrom columns User Manual (document no. 28-9562-89).
AxiChrom columns Safety Instructions (document no. 28-9203-60)—safety information and instructions.
AxiChrom Operating instruction (document no. 28-9562-91)
AxiChrom columns Read Me First (document no. 28-9562-91), enclosed with the column—instructions on how to unpack the column from its crate.
AxiChrom 50 - 200
Two standard exchangeable tube lengths are available. One short tube bed heights 10-30 cm and one long tube for bed heights 30-50 cm.
Note that you must also replace the tube rods when changing the column tube.
AxiChrom 300 - 1000
Not recommended.
Performing a column leakage test (AxiChrom 50, 70, 100, 140 and 200 columns)
Note: Read the hole procedure before starting the test.
WARNING! Only liquid should be used in the column during the leakage test, that is, no media!
| 1. Leakage test with liquid in the hydraulic chamber |
| 1. Close the hydraulic chamber inlet with a stop plug. 2. Fill the column with liquid. 3. Assemble the adapter and top plate assembly onto the column (see the User Manual). 4. Ensure that one of the mobile phase inlet/outlet is open and the other closed. 5. Insert a syringe into the vent valve and open the valve. 6. Pump liquid into the hydraulic chamber through the hydraulic chamber outlet. Note: Observe that liquid shall be pumped in through the hydraulic chamber outlet when performing a leakage text for the hydraulic chamber. This is because the correct pressure is not registered during measurement by the check valve at the hydraulic chamber inlet. 7. Close the hydraulic chamber vent valve when only liquid escapes the valve. 8. The adapter moves down. Stop the pump when the adapter is at a suitable height. Water should be seen emerging from the open mobile phase inlet/ outlet. 9. Close the open mobile phase inlet/ outlet. 10. Pump liquid into the hydraulic chamber at a low liquid flow rate monitoring the pressure. Stop the pump when pressure is equal to maximum packing pressure (see the User Manual). Note: In order for the pressure to continue to be registered on an ÄKTA explorer or ÄKTApilot when the pump has stopped, the flow must be set to zero (Flow = 0). If Pause or Stop are used to stop the flow, this will even cause the registration of pressure to cease. 11. Wait about 15 minutes until pressure is stable. 12. Monitor the pressure on the pressure gauge. The pressure drop should not exceed 0.1 bar g during 5 minutes. A recorder linked to a pressure controller gives more precise figures during this procedure. 13. If the pressure drop exceeds this limit check try to localize the source of the leakage. Begin with the valves and outlets for signs of leakage. If the leakage cannot be localized there, this means that the adapter sealing system is most likely the cause. Complete the test, empty the column, and take the necessary steps to rectify the suspected problem. Repeat the leakage test. |
| 2. Leakage test with liquid in the process chamber |
| 1. Fill the column with liquid and assemble the adapter and top plate assembly onto the column (see the User Manual). 2. Ensure that one mobile phase inlet/outlet is open and the other closed. 3. Insert a syringe into the vent valve and open the valve. 4. Pump liquid into the hydraulic chamber through the hydraulic chamber inlet. 5. Close the hydraulic chamber vent valve when only liquid escapes the valve. 6. The adapter moves down. Stop the pump when the adapter is at a suitable height. Water should emerge from the open mobile phase inlet/outlet. 7. Assemble the mechanical locking device (see the User Manual). 8. Pump liquid into the process chamber at a low liquid velocity while monitoring the pressure. Stop the pump when pressure is equal to maximum packing pressure (see the User Manual). Note: In order for the pressure to continue to be registered on an ÄKTA explorer or ÄKTApilot when the pump has stopped, the flow must be set to zero (Flow = 0). If Pause or Stop are used to stop the flow, this will even cause the registration of pressure to cease. 9. Monitor the pressure on the pressure gauge. The pressure drop should not exceed 0.1 bar g during 5 minutes. A recorder linked to a pressure controller gives more precise figures during this procedure. 10. If the pressure drop exceeds this limit check try to localize the source of the leakage. Begin with the valves and outlets for signs of leakage. If the leakage cannot be localized there, this means that the adapter sealing system is most likely the cause. Complete the test, empty the column, and take the necessary steps to rectify the suspected problem. Repeat the leakage test. |
Performing a column leakage test (AxiChrom 300 - 1000 columns)
Perform a leakage test when:
• the column is new,
• the column has been shipped,
• the o-rings have been replaced, or
• other parts that may cause leakage have been replaced.
Note: Read the hole procedure before starting the test.
WARNING! Only liquid should be used in the column during the leakage test, that is, no media!
| Material |
| • Reference pressure gauge (calibrated, range: 0-10 bar) • External pump with control unit (ex. P-900 and CU-950) • Three valves (and a Check valve if not included in the pump outlet) • Water tank • Support block with dimensions 100 × 150 × 200 mm • Pipes and bows to connect the pump, water tank, valves and pressure gauge • End caps |
| Procedure |
| 1. Fill the water tank with water and let it adjust to the ambient temperature before continuing. Note: To be able to perform the test correctly both the AxiChrom column and test media have to have the same ambient room temperature during the whole test. 2. Connect the column and the Master to the water tank. 3. Start the Master. 4. Open the bottom valve using the Master MANUAL CONTROL wizard. 5. Set up the test with the AxiChrom column as in figure below:  Fig. Connections for performing a leakage test. a) Connect the water tank to the Pump inlet. b) Connect Valve 1 to the Bottom mobile phase inlet/outlet on the AxiChrom column and seal the other two connections with end caps. c) Connect a t-connection to: • Valve 1 • the Pump outlet, and • a Valve 2 with a hose leading to waste Note: Put a plastic block underneath the tubing to relieve the Bottom mobile phase inlet/outlet. d) Connect the AxiChrom Pressure gauge for the Master, a Reference pressure gauge and shut-off Valve 3 to the Top mobile phase. e) Connect a hose to Valve 3 that leads the water back to the tank. f) Open Valve 3 fully. 6. Move the adapter so that the lower adapter scraper seal is positioned in the middle of the priming groove, creating a clear passage to the flushing channels so that the filling water can pass out through the flushing connector in later steps. 7. Fill the column gently by starting the pump in a low flow (below 400 cm/h) and opening Valve 1 completely (Valve 2 should be closed). 8. Continue filling water until its seeps out from the flushing connectors, and then move the adapter below the priming groove. 9. Press out the remaining air in the column and hoses with the pump at a speed of below 400 cm/h. 10. Stop the pump when there is no air left. 11. Move the adapter to its maximum bed height (30 cm for a short column tube, or 50 cm for a long column tube) and make sure that all air is evacuated from the column. Note: The process chamber under the adaptor must be completely filled with liquid. 12. Close shut-off Valve 3 completely. 13. By using the pump, gently pressurize the column to the intended test pressure allowing the pressure to stabilize. (Test pressure = design pressure for the AxiChrom column.) Note: It might take several minutes to adjust the pressure until it is stable. 14. When a stabile pressure has been achieved, close the shut-off Valve 1 and note the pressure and start time. 15. Monitor the pressure and let the column be pressurized for 30 ±5 minutes. 16. When the test period is reached, record the pressure and evaluate the result. The pressure drop should not exceed 0.20 bar during the test period (30 minutes). If the pressure has dropped more and continues to drop when the 30 minutes have passed, there is a substantial risk that the column is leaking. Note: If no leak is found and there is a doubt about if the AxiChrom column is really leaking, redo the test before releasing the pressure. (There might be a test valve that leaks). 17. Before releasing the pressure, check for liquid leakage, especially around the o-rings. 18. Release the pressure slowly, by slowly opening the valve no 1 and then slowly opening Valve 3. Note: If the pressure is released too fast, there is a slight risk that any remaining air will expand and damage the column when depressurized. 19. Empty the column by opening Valve 2 and moving the adapter downward. |
| AxiChrom columns | 50 | 70 | 100 | 140 | 200 | |||||
| Inner column diameter (mm) | 50 | 70 | 100 | 140 | 200 | |||||
| Column type | 50/300 | 50/500 | 70/300 | 70/500 | 100/300 | 100/500 | 140/300 | 140/500 | 200/300 | 200/500 |
| Bed height (cm) | 10–30 | 30–50 | 10–30 | 30–50 | 10–30 | 30–50 | 10–30 | 30–50 | 10–30 | 30–50 |
| Weight, empty column (kg) | 6.5 | 7.5 | 10 | 11.5 | 16.3 | 19.3 | 28.5 | 31.5 | 41.5 | 45.5 |
| Weight, column stand (kg) | 7 | 7.5 | 7 | 7.5 | 7 | 7.5 | 23.5 | 25 | 23.5 | 25 |
| Max. operating work height (mm) | 1400 | 1700 | 1650 | 1800 | 1650 | 1800 | 2000 | 2100 | 2000 | 2100 |
| Max. operating pressure (bar g) | 10 | 8 | 8 | 8 | 6 | 5 | ||||
| Max. packing pressure (bar g) | 20 | 15 | 10 | 10 | 8 | 6 | ||||
| Footprint ,foot (mm × mm) | 352 × 352 | |||||||||
| Footprint, stand (mm × mm) | 350 × 360 | 350 × 360 | 615 × 550 | |||||||
| Operating temperature (°C) | 2–30 | 2–30 | 2–30 | |||||||
|
AxiChrom columns |
300 | 400 | 450 | 600 | 800 | 1000 | ||||||
| Inner column diameter (mm) | 300 | 400 | 450 | 600 | 800 | 1000 | ||||||
| Column type |
300/ 300 |
300/ 500 |
400/ 300 |
400/ 500 |
450/ 300 |
450/ 500 |
600/ 300 |
600/ 500 |
800/ 300 |
800/ 500 |
1000 /300 |
1000 /500 |
| Bed height (cm) |
10– 30 |
10– 50 |
10– 30 |
10– 50 |
10– 30 |
10– 50 |
10– 30 |
10– 50 |
10– 30 |
10– 50 |
10– 30 |
10– 50 |
|
Weight, empty column (kg) |
420 | 440 | 460 | 480 | 710 | 760 | 835 | 900 | 2150 | 2240 | 2560 | 2680 |
| Max. operating work height (mm) | 2060 | 2580 | 2060 | 2580 | 2080 | 2600 | 2190 | 2710 | 2480 | 3000 | 2490 | 3010 |
|
Max. operating pressure (bar g) |
4 | |||||||||||
| Footprint,foot(mm×mm) |
520× 1110 |
600× 1110 |
620× 1110 |
780× 1180 |
1080× 1470 |
1300× 1720 |
||||||
|
Operating temperature (°C) |
2–30 | |||||||||||
Surface finish of wetted Acrylic parts: Ra 0.8 µm.
Surface finish of wetted Glass parts: Ra 0.4 µm.
Surface finish of wetted PEEK parts: Ra 1.0 µm.
Surface finish of wetted PP parts: Ra 2.4 µm.
Surface finish of wetted Steel parts: Ra 0.5 µm (electropolished).
How shall I clean my empty column?
First make sure that the equipment is completely leakage-free.
After cleaning, rinse the equipment with suitable liquid until it is completely free from the cleaning solution.
AxiChrom columns
All column parts can be cleaned with the most commonly used agents, such as detergents, ethanol, weak acids, sodium hydroxide and high salt concentration. For special cleaning agents, please refer to chemical resistance information in User Manual supplied with the column.
AxiChrom 50 - 70
Stainless steel 20 µm nets.
AxiChrom 100 - 200
Stainless steel 10 µm and 20 µm nets.
AxiChrom 300 - 1000
Stainless steel 10 µm and 20 µm nets.
What relief pressure should I choose for the column safety valve?
|
Column |
Release pressure (bar g) |
| AxiChrom 50 | Not applicable |
| AxiChrom 70 | Not applicable |
| AxiChrom 100 | Not applicable |
| AxiChrom 140 | Not applicable when running the column with ÄKTAprocess The column has a maximum operating pressure of 6 bar. |
| AxiChrom 200 | Not applicable when running the column with ÄKTAprocess The column has a maximum operating pressure of 5 bar. |
| AxiChrom 300 | 4 |
| AxiChrom 400 | 4 |
| AxiChrom 450 | 4 |
| AxiChrom 600 | 4 |
| AxiChrom 800 | 4 |
| AxiChrom 1000 | 4 |
|
Column |
Inner diameter of tubing |
| AxiChrom 50 | 1.2 - 1.7 mm |
| AxiChrom 70 and AxiChrom 100 | 2.9 mm |
| AxiChrom 140 | 3.2 mm (for media with bead size <50 µm) and 4.8 mm (for media with a bead size >50 µm) |
| AxiChrom 200 | 6.4 mm |
| AxiChrom 300 | 12.7 mm |
| AxiChrom 400 | 19.1 mm |
| AxiChrom 450 | 19.1 mm |
| AxiChrom 600 | 19.1 mm |
| AxiChrom 800 | 25.4 mm |
| AxiChrom 1000 | 25.4 mm |
Column evaluation
The efficiency of a column depends on how well it is packed. A poorly packed column gives rise to uneven flow, resulting in zone broadening and reduced resolution. It is thus important to have a method by which the column can be tested before it is put into operation. Such a method should be simple, quantitative and should not introduce contaminating materials. It is also an advantage if the same method can be used to monitor column performance over its working life, so that it is easy to determine when the medium should be re-packed or replaced.
Avoid methods that use colored compounds such as Blue Dextran. They do not meet the above criteria and cannot be used with ion exchange and affinity chromatography media.
Experience has shown that the best method of expressing the efficiency of a column is in terms of the height equivalent to a theoretical plate, HETP, reduced plate number, h, and the peak asymmetry factor, As. These values can be determined easily by applying a NaCl or acetone solution, to the column (see below).
It is important that the column is properly equilibrated ( >2 column volumes) before evaluating the packing. Ideally, run three test runs to see whether the values are stable. If an initially poor result improves during a later test, the reason can be that the column was not properly equilibrated. To check that the bed is stable, run the column at 70% packing pressure for 20 hours and test it again.
Note that pressure spikes may cause poor packing (cracking). If this happens, fit an air trap and a pressure relief valve between the pump and column. Locate the pressure relief valve between the air trap and the column.
Choice of test sample for columns
The most appropriate material for column testing is, of course, the sample that is to be run in the application, but this is not always practical or economical. As an alternative, a solution of either NaCl or acetone will give a good indication of the column packing quality. The eluate is monitored by measuring conductivity or UV absorption, and the resulting elution profile is used to calculate the HETP value.
The advantages of using NaCl are that it is readily available and can be used safely to test all columns. One disadvantage is that NaCl may interact with the medium matrix, especially ion exchanger matrices, and thus give erroneous results.
Acetone, in contrast, does not interact with the matrix and is detected by UV absorption at 280 nm. Alternatively, you can increase the running buffer concentration 10-fold and use it as test solution.
The figure below shows a UV trace for acetone in a typical BPG column application and gives calculated HETP and As values.
HETP calculation
The sample volume should be approximately 1% of the total bed volume and the concentration 1.0% v/v NaCl, or equivalent when using stronger buffer. Alternatively, use 1.0% v/v acetone. The flow velocity should be between 10 and 30 cm/h depending on the bead size of the chromatography medium. The high flow velocity could be used for small beads whereas large beads only allow low flow velocity. To avoid diluting the sample, apply it as close to the column inlet as possible. If an airtrap is included in the system, by-pass it during sample application to avoid back-mixing. Calculate the HETP value from the conductivity (or UV) curve as follows:
HETP, in its simplest terms, is expressed as:
HETP = L/N
where,
L = Bed height (cm)
N = Number of theoretical plates.
N is defined by the equation:
N = 5.54 (Ve /Wh)2
where,
Ve = Elution volume (ml)
Wh = Peak width at half height (ml)
Ve is measured as the volume passed through the column to the peak maximum.
Wh is measured as the peak width at half-peak height.
From the example in the figure, the HETP value can be calculated from the chromatogram as follows:
 |
Ve (ml) | Wh (ml) | N | N/m | HETP cm |
| Acetone | 18800 | 900 | 2417 | 4203 | 0.024 |
Well-packed columns have low HETP values. However, it is only possible to compare columns that have been packed with the same type of media and that have been tested under identical conditions.
As a general rule-of-thumb, a good HETP value is approximately two to four times the mean bead diameter of the medium in question, provided that the sample does not interact with the medium.
In practice, the correlation between HETP and column performance can only be assessed by the column operator. Once this has been established, a standard can be set to judge the acceptability of a column packing.
For example, the column operator may know from experience that a column packed with Sephadex G-25 gel filtration medium with HETP values above 0.05 cm does not give the required separation. Consequently, the operator will set this value as the maximum permissible i.e. the minimum acceptable quality.
Reduced plate number
Definition of reduced plate number: h = HETP/dp
h = reduced plate number
HETP = above described height equivalent to a theoretical plate
dp = mean particle diameter of the chromatography medium beads
The reduced plate number should be in the range of 2-4 times the mean particle diameter of the chromatography medium beads.
Peak asymmetry factor calculation
The peak asymmetry factor should be as close as possible to 1, and the shape of the peak should be as symmetrical as possible. This is usually the case for gel filtration media, but for certain ion exchange and affinity media, the shape may be asymmetrical due to interaction with the media. A change in peak shape is usually the first indication of column deterioration.
The peak asymmetry factor, As, is calculated from the graph above:
As = b/a
where,
a = distance from peak apex to 10% of the peak height on the ascending side of the peak
b = distance from peak apex to 10% of the peak height on the descending part of the peak
Note: Measuring HETP, h and As values is the best way to judge the condition of the packed column. A packed column can look good, but still need repacking for optimal performance. Always check the column after packing and regularly between runs to ensure best performance.
AxiChrom
All wetted parts of plastics/elastomers have been approved according to biological reactivity testing in vivo, USP class VI.
Packed bed columns
Packing and running packed bed columns requires a pump that gives a pulse-free flow. Installing a pulse reducer may also be necessary. For high flow velocities and low pressures up to approximately 3 bar, we recommend lobrotor pumps. For higher pressures, use membrane pumps with three pump heads (pump heads reduce pulsations) or screw pumps, although both these have limited flow capacity
Expanded bed adsorption
Use peristaltic pumps for STREAMLINE and STREAMLINE Direct columns
Packed columns
Equilibrate and store packed columns according to the instructions for the medium.
Systems
Systems must be cleaned and sanitized prior to storage. During storage, keep the system filled with 0.01 M sodium hydroxide or 20% ethanol solution.
Please note that acrylic column tubes can withstand 20% ethanol up to 12 months with maximum pressure of 0.5 bar.
Cracks are mainly due to pump pulsation or a too densely or too loosely packed bed.
Possible cause: Pump pulsation
Remedy: Repack the column with a pulse-free pump or add an air trap and a pressure relief valve to the assembly.
Possible cause: Too densely packed bed
Remedy: Repack the column with reduced packing flow rate or pressure.
Possible cause: Too loosely packed bed
Remedy: It may be possible to only adjust the adaptor. Otherwise repack the column with increased packing flow rate or pressure.
How do I correct a gap between the packed bed and lid/adaptor?
It may be possible to only adjust the adaptor. If not, you have to repack the column.
AxiChrom
| Column | Bed height (cm) | Bed volume* (l) |
| AxiChrom 50 (short column tube) |
10-30 | 0.20-0.59 |
| AxiChrom 50 (long column tube) |
30-50 | 0.59-0.98 |
| AxiChrom 70 (short column tube) |
10-30 | 0.39-1.15 |
| AxiChrom 70 (long column tube) |
30-50 | 1.15-1.92 |
| AxiChrom 100 (short column tube) |
10-30 | 0.79-2.36 |
| AxiChrom 100 (long column tube) |
30-50 | 2.36-3.93 |
| AxiChrom 140 (short column tube) |
10-30 | 1.54-4.62 |
| AxiChrom 140 (long column tube) |
30-50 | 4.62-7.70 |
| AxiChrom 200 (short column tube) |
10-30 | 3.14-9.42 |
| AxiChrom 200 (long column tube) |
30-50 | 9.42-15.71 |
| AxiChrom 400 (short column tube) |
10-30 | 13-38 |
| AxiChrom 400 (long column tube) |
10-50 | 13-63 |
| AxiChrom 450 (short column tube) |
10-30 | 16-48 |
| AxiChrom 450 (long column tube) |
10-50 | 16-80 |
| AxiChrom 600 (short column tube) |
10-30 | 28-85 |
| AxiChrom 600 (long column tube) |
10-50 | 28-141 |
| AxiChrom 800 (short column tube) |
10-30 | 50-151 |
| AxiChrom 800 (long column tube) |
10-50 | 50-251 |
| AxiChrom 1000 (short column tube) |
10-30 | 79-236 |
| AxiChrom 1000 (long column tube) |
10-50 | 79-393 |
* Column volumes do not take medium compression into consideration.
Cleaning-in-place
Cleaning-in-place (CIP) removes precipitated material, strongly bound substances and other contaminants from the column bed without dismantling the column.
Regular CIP of the packed column between production batches ensures proper product quality and maintains expected medium and equipment life. An efficient CIP protocol depends on medium in use and the characteristics of the contaminants. Refer to the instructions for each medium.
Sanitization
Sanitization is the reduction of microbial contamination in the column and related equipment to an acceptable minimum. A specific sanitization protocol should be designed for each process according to the type of contaminants present.
Note: Always ensure that columns, systems and auxiliary components are compatible with the chemicals used.
Sodium hydroxide is widely accepted for cleaning empty equipment, cleaning packed chromatography columns (cleaning-in-place , CIP), sanitizing and storing chromatography media and systems.
For CIP, sodium hydroxide has been extensively used to remove proteins and nucleic acids from ion exchange, hydrophobic interaction and gel filtration media. Its use with affinity media is restricted due to the limited stability of affinity ligands. If lipids are bound to a protein, an increased concentration of sodium hydroxide may be required for effective cleaning.
Sodium hydroxide is also effective for inactivating most viruses, bacteria, yeasts and endotoxins. It is common practice in industrial manufacturing to save time by adding salt, e.g. sodium chloride, to the sodium hydroxide solution to combine cleaning with sanitization as well. Since sodium hydroxide is a bacteriostat, it is also useful for storage.
The benefits of using sodium hydroxide include efficacy and low cost, plus ease of detection, removal and disposal.
Precautions
Always ensure that chromatography media, columns, systems and auxiliary components are compatible with sodium hydroxide at the concentration, time and temperatures used. Also keep in mind that sodium hydroxide may be corrosive to both metal and skin.
Compatibility with chromatography media
The concentration of sodium hydroxide used for CIP and/or sanitization will often depend on the level of contamination. For chromatography media, the ability to withstand stringent sanitizing conditions depends on the functional groups, attachment chemistries and the stability of the base matrices to alkaline conditions.
Table 4 in Application Note “Use of sodium hydroxide for cleaning and sanitizing chromatography media and systems” lists the general stability of a wide range of media as a function of pH. See more on Application notes: Use of sodium hydroxide for cleaning and sanitizing chromatography media and systems
Spare parts
Important: Some of the spare parts must be installed by a Cytiva service engineer. Please see the Spare part list in your Product documentation binder for more details or contact your local Cytiva service representative.
| # | Product Name | Product Code | Price | |
|---|---|---|---|---|
| 104 | Wheel gasket | 28926850 | 377.00 USD |
Add to cart
|
| 105 | Castor with brake | 28931377 | 442.00 USD |
Add to cart
|
| 106 | Castor without brake | 29056995 | 86.15 USD |
Add to cart
|
| 109 | Tank cable, AxiChrom Master 300-1600 | 29091265 | 497.00 USD |
Add to cart
|
| 110 | Encoder cable, AxiChrom Master 300-1600 | 29091262 | 569.00 USD |
Add to cart
|
| 111 | Motor cable, AxiChrom Master 300-1600 | 29091777 | 2,055.00 USD |
Add to cart
|
| 112 | Hose kit, air, media valve | 29103258 | 987.00 USD |
Add to cart
|
| 113 | Quick change socket, KK3S | 29091832 | 50.20 USD |
Add to cart
|
| 114 | Quick change socket, KK4S | 29091833 | 54.88 USD |
Add to cart
|
| 115 | Hose kit, air, rinse nozzle | 29091289 | 1,020.00 USD |
Add to cart
|
| 116 | Profibus cable, AxiChrom Master 300-1600 | 29091263 | 219.00 USD |
Add to cart
|
| 117 | Pressure cable, AxiChrom Master 300-1600 | 29091264 | 223.00 USD |
Add to cart
|
| 118 | Air filter/Regulator | 28926830 | 305.00 USD |
Add to cart
|
| 123 | Safety relay | 28926842 | 1,465.00 USD |
Add to cart
|
| 124 | Ethernet switch, Stratix 2000 | 29091836 | 503.00 USD |
Add to cart
|
| 125 | Circuit breaker 4A 1-pole | 28407190 | 199.00 USD |
Add to cart
|
| 127 | Power supply 400VAC-24VDC | 28926848 | 854.00 USD |
Add to cart
|
| 128 | Circuit breaker 3A 2-pole | 29112520 | 295.00 USD |
Add to cart
|
| 131 | Control unit, AxiChrom Master 300-1600 | 29091274 | 13,900.00 USD |
Add to cart
|
Note:
See system documentation, bill of material, for the number of units and materials of components installed on your column.
Item numbers in gray illustrates parts in contact with process stream/or that are pressure retaining.
All items are not available as standard spare parts, for ordering non-standard parts contact your local Cytiva service representative.
Item numbers are not necessarily in sequential order.
| # | Product Name | Product Code | Price | |
|---|---|---|---|---|
| 412 | Pressure transmitter | 28936809 | 1,731.00 USD |
Add to cart
|
Please note:
Please see system documentation, bill of material, for the number of units and materials of components installed on your column.
Item numbers in gray illustrates parts in contact with process stream/or that are pressure retaining.
All items are not available as standard spare parts, for ordering non-standard parts contact your local Cytiva service representative.
Item numbers are not necessarily in sequential order.
| # | Product Name | Product Code | Price | |
|---|---|---|---|---|
| 514 | Nozzle Pipe Seal, PTFE | 28902478 | 272.00 USD |
Add to cart
|
| 541 | O-ring 200x5 EPDM | 29088049 | 114.53 USD |
Add to cart
|
| 608 | O-Ring 28.25x2.62 FEP encap. Silicone | 29043777 | 167.67 USD |
Add to cart
|
| 609 | O-ring 21.95x1.78 EPDM | 29043775 | 100.98 USD |
Add to cart
|
| 615 | O-ring 15.2x3.5 EPDM | 29088048 | 216.00 USD |
Add to cart
|
Please note:
Please see system documentation, bill of material, for the number of units and materials of components installed on your column.
Item numbers in gray illustrates parts in contact with process stream/or that are pressure retaining.
All items are not available as standard spare parts, for ordering non-standard parts contact your local Cytiva service representative.
Item numbers are not necessarily in sequential order.
| # | Product Name | Product Code | Price | |
|---|---|---|---|---|
| 117 | Flushing connection nut | 28926901 | 324.00 USD |
Add to cart
|
| 137 | Flushing inlet tubing | 28936817 | 1,380.00 USD |
Add to cart
|
| 197 | O-ring 6.02x2.62 mm | 28926895 | 175.14 USD |
Add to cart
|
| 198 | O-ring 26.64x2.62 mm | 28926897 | 212.00 USD |
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|
| 413 | O-ring 61x2 FFKM/FFPM | 29087986 | 769.00 USD |
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|
Please note:
Please see system documentation, bill of material, for the number of units and materials of components installed on your column.
Item numbers in gray illustrates parts in contact with process stream/or that are pressure retaining.
All items are not available as standard spare parts, for ordering non-standard parts contact your local Cytiva service representative.
Item numbers are not necessarily in sequential order.
| # | Product Name | Product Code | Price | |
|---|---|---|---|---|
| 211 | O-ring 1565x9.525 FEP-encap. FPM/FKM | 29087915 | 1,303.00 USD |
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|
| 233 | Hex head bolt M12x60 mm | 28923843 | 195.20 USD |
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|
Please note:
Please see system documentation, bill of material, for the number of units and materials of components installed on your column.
Item numbers in gray illustrates parts in contact with process stream/or that are pressure retaining.
All items are not available as standard spare parts, for ordering non-standard parts contact your local Cytiva service representative.
Item numbers are not necessarily in sequential order.
| # | Product Name | Product Code | Price | |
|---|---|---|---|---|
| 413 | O-ring 61x2 FFKM/FFPM | 29087986 | 769.00 USD |
Add to cart
|
| 414 | O-Ring 1376x10 EPDM | 29088045 | 1,668.00 USD |
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|
| 415 | O-ring 1337x15 EPDM | 29089545 | 1,762.00 USD |
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|
| 624 | O-ring 34.2x3 FFPM/FFKM | 29087988 | 288.00 USD |
Add to cart
|
Please note:
Please see system documentation, bill of material, for the number of units and materials of components installed on your column.
Item numbers in gray illustrates parts in contact with process stream/or that are pressure retaining.
All items are not available as standard spare parts, for ordering non-standard parts contact your local Cytiva service representative.
Item numbers are not necessarily in sequential order.
| # | Product Name | Product Code | Price | |
|---|---|---|---|---|
| 601 | O-ring 34.2x3 FFPM/FFKM | 29087988 | 288.00 USD |
Add to cart
|
| 602 | O-Ring 94.84x3.5 EPDM | 29088051 | 155.08 USD |
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|
| 616 | O-Ring 33x1.78 EPDM | 29088052 | 320.00 USD |
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|
| 618 | O-ring 24x3.5 EPDM | 29088180 | 525.00 USD |
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|
Accessories
In the figure below the column is connected to a system with the same inlet dimensions.
The use of reducers may be necessary depending on the dimensions of the system.
| # | Product Name | Product Code | Price | |
|---|---|---|---|---|
| 1 | Tubing, 2 m, i.d. 19.1 mm, 25 mm TC | 28938127 | 3,082.00 USD |
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|
| 5 | Gasket, 25 mm TC, i.d. 15.8 mm | 28938188 | 289.00 USD |
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|
| 6 | Gasket, 50 mm TC, i.d. 34.9 mm | 28938189 | 271.00 USD |
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|
| 7 | Clamp, 25 mm TC | 28938190 | 143.86 USD |
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|
| 8 | Clamp, 50 mm TC | 28938191 | 265.00 USD |
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|
In the figure below the column is connected to a system with the same inlet dimensions.
The use of reducers may be necessary depending on the dimensions of the system.
| # | Product Name | Product Code | Price | |
|---|---|---|---|---|
| 2 | Tubing, 2 m, i.d. 38.1 mm, 51 mm TC | 28938138 | 4,858.00 USD |
Add to cart
|
| 6 | Gasket, 50 mm TC, i.d. 34.9 mm | 28938189 | 271.00 USD |
Add to cart
|
| 8 | Clamp, 50 mm TC | 28938191 | 265.00 USD |
Add to cart
|
In the figure below the column is connected to a system with the same inlet dimensions.
The use of reducers may be necessary depending on the dimensions of the system.
Clamps and seals for the column inlets are included with the column. Tubing, clamps and seals used for connection in the system end are not included.
| # | Product Name | Product Code | Price | |
|---|---|---|---|---|
| 2 | Tubing, 2 m, i.d. 38.1 mm, 51 mm TC | 28938138 | 4,858.00 USD |
Add to cart
|
| 6 | Gasket, 50 mm TC, i.d. 34.9 mm | 28938189 | 271.00 USD |
Add to cart
|
| 8 | Clamp, 50 mm TC | 28938191 | 265.00 USD |
Add to cart
|
| 10 | Rupture Disc 4.2 bar, TC 50, i.d. 1.5” | 29092181 | 2,100.00 USD |
Add to cart
|
| 12 | T-Junction, 1 1/2", 3 × 50 mm TC | 28938171 | 449.00 USD |
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|
| 13 | Pressure transmitter | 28936809 | 1,731.00 USD |
Add to cart
|
| 13 | Pressure transmitter, TC50 Hastelloy | 28985264 | 1,399.00 USD |
Add to cart
|
| 14 | Pressure cable, AxiChrom Master 300-1600 | 29091264 | 223.00 USD |
Add to cart
|
In the figure below the column is connected to a system with the same inlet dimensions.
The use of reducers may be necessary depending on the dimensions of the system.
Clamps and seals for the column inlets are included with the column. Tubing, clamps and seals used for connection in the system end are not included.
| # | Product Name | Product Code | Price | |
|---|---|---|---|---|
| 6 | Gasket, 50 mm TC, i.d. 34.9 mm | 28938189 | 271.00 USD |
Add to cart
|
| 8 | Clamp, 50 mm TC | 28938191 | 265.00 USD |
Add to cart
|
Troubleshooting
Find solutions to product related issues. For unlisted issues please contact local Cytiva service representation.
Back pressure increases during operation
| Possible cause | Suggested remedy |
|---|---|
Air trapped in the bed supports |
Get rid of the air by wetting and washing the bed supports with 20% ethanol. If necessary disassemble the column according to the instructions. |
Pre-filter blocked |
Check the pre-filter and remove the blockage. |
Protein precipitated on the column |
Clean and regenerate the column and chromatography medium according to instructions. |
Sample and collection vessels at different levels |
Adjust the vessels to approximately the same level. |
Valve flow-paths too narrow |
Check all valves. Replace if necessary with valves that have a correct (wider) inner diameter. |
Valve not fully open |
Check all valves. Open any that is not fully open. |
Auxiliary equipment such as manometers and pumps not working properly |
Check the function of all auxiliary equipment. Repair/replace if necessary. |
Bed packed too densely |
Evaluate the packing using recommended methods. If the results are poor, refer to the symptom ‘Poor packing evaluation’. |
Bent tubing |
Check that the flow path is not restricted. |
Buffer viscosity too high |
Check the viscosity of all buffers. Viscosity is a function of temperature. (Lower temperature gives higher viscosity.) Let low-temperature buffer reach operating temperature before starting the run. |
Column bed supports blocked by protein or medium |
To remove protein: To remove chromatography medium: Preventive action: |
Equipment in general (valves, flow cells, gaskets, etc.) has internal diameters too narrow for the flow rates used. |
Ensure that the internal diameter of all equipment before and after the column is the same as the column inlet and outlet. |
For hydrophobic interaction chromatography - Protein precipitated on the column due to incorrect ionic strength. |
Check and adjust conductivity to the correct value. Clean and regenerate the column and chromatography medium according to instructions. |
Microbial growth in buffers |
Check buffers, especially those with phosphate, for microbial growth. Replace with fresh buffer if necessary. |
Poor packing evaluation result
On this troubleshooting site, we refer to leading and tailing peaks as defined according to the following figures.
 Leading peak |  Tailing peak |
Experience shows that the best method of expressing the efficiency of a packed column is in terms of its height equivalent to a theoretical plate (HETP), reduced plate number (h) and its peak asymmetry factor (As).
| Possible cause | Suggested remedy |
|---|---|
Cracks in the bed or a gap between the chromatography medium and inlet. The column may have been packed too loosely |
It may be possible to only adjust the adaptor. Otherwise, repack the column with increased packing flow rate or pressure. Preventive action: |
Blocked bed support creates zones of different flow velocities |
To remove protein: |
| Possible cause | Suggested remedy |
|---|---|
Cracks in the bed due to pump pulsation or a too densely packed bed. The cracks are mainly vertical. |
Repack the column with a pulse-free pump or add an air trap and a pressure relief valve. Preventive action: |
A crack due to a torn bed support resulting in a jet stream. |
Replace the bed support according to instructions |
| Possible cause | Suggested remedy |
|---|---|
Test molecule is repelled by the chromatography medium under the conditions used, e.g. salt for ion exchange chromatography, or chromatography medium in water as running buffer |
Use appropriate test molecule and conditions, e.g. 800 mM salt as sample in 400 mM salt buffer for ion exchange media, or use acetone. |
| Possible cause | Suggested remedy |
|---|---|
Test molecule interacts with the chromatography medium under the conditions used, e.g. acetone interacts with SOURCE media |
Use appropriate test molecule and conditions, e.g. salt for SOURCE media. |
| Possible cause | Suggested remedy |
|---|---|
Too large sample volume (gives a broad peak) |
Use a sample volume that is maximum 2% of the column volume. |
Too great a distance between the sample injection and column inlet, or between the column outlet and analyzing instrument |
Shorten these distances (minimizes dilution). |
Large liquid volume in tubing, valves, connectors, etc |
Minimize dilution by reducing the liquid volume. For example, if the inner diameters of the tubing, valves, connectors, etc. are wider than the column inlet and outlet, change them to the same diameter. |
Flow velocity too high or too low |
Flow velocity should be in the range 15-60 cm/h depending on particle size. The smaller the particle, the higher the velocity. |
| Possible cause | Suggested remedy |
|---|---|
Bed packed too densely |
Repack the column with decreased packing flow rate or pressure (prepare a pressure/flow curve and use the data to define the correct packing flow rate, i.e. approx. 70% of maximum flow (plateau)). |
| Possible cause | Suggested remedy |
|---|---|
Bed settled too hard during the first step |
Repack the column with decreased packing flow rate for the sedimentation step. |
| Possible cause | Suggested remedy |
|---|---|
Extra volume in the system, e.g. new tubing (longer, shorter or different diameter) affects peak position and HETP |
Ensure the equipment is the same or identical to your test routine or SOP. |
| Possible cause | Suggested remedy |
|---|---|
Column not properly equilibrated before packing evaluation |
Re-equilibrate the column. Evaluate the packing again, using recommended methods. |
| Possible cause | Suggested remedy |
|---|---|
Column not properly equilibrated before packing evaluation |
Re-equilibrate the column. Evaluate the packing again, using recommended methods. |
| Possible cause | Suggested remedy |
|---|---|
Bed packed too densely or too loosely |
Repack the column. Evaluate the packing afterwards, using recommended methods. For a leading peak and one-step packing: For a leading peak and two-step packing: For a tailing peak and one-step packing: For a tailing peak and two-step packing: Preventive action: |
| Possible cause | Suggested remedy |
|---|---|
Bed packed too densely. Cracks present at the beginning get worse |
Repack the column. Evaluate the packing again, using recommended methods. One-step packing: Two-step packing: Preventive action: |
| Possible cause | Suggested remedy |
|---|---|
Bed too loosely packed causing space between chromatography medium and inlet |
Repack the column. Evaluate the packing again, using recommended methods. One-step packing: Two-step packing: Preventive action: |
| Possible cause | Suggested remedy |
|---|---|
Bed not packed densely enough |
Repack the column with increased packing flow rate or pressure (prepare a pressure/flow curve and use the data to define the correct packing flow rate, i.e. approx. 70% of maximum flow (plateau)). After re-packing the column evaluate the packing. Preventive action: |
| Possible cause | Suggested remedy |
|---|---|
Bed settled too loosely during the first step |
Repack the column with increased packing flow rate for the sedimentation step. Preventive action: |
Poor product recovery
| Possible cause | Suggested remedy |
|---|---|
Irreversible adsorption to matrix |
First try to modify the elution conditions. If this doesn’t help, clean and re-generate the column and chromatography medium according to instructions. |
| Possible cause | Suggested remedy |
|---|---|
Tertiary structure disrupted |
Shorten the residence time on the column. Use higher flow velocities to minimize exposure. |
| Possible cause | Suggested remedy |
|---|---|
Target molecules transferred from previous run due to poor cleaning between runs. |
Evaluate your cleaning procedure. |
Inhibiting component removed during purification |
Happens some times. Take into consideration and try to avoid. |
Different assay conditions used before and after chromatography |
Use the same conditions for all assays. |
| Possible cause | Suggested remedy |
|---|---|
A co-factor used to define recovery has been removed, thus causing lower activity |
Check the integrity of the enzyme or enzyme/co-factor complex. |
Column not equilibrated properly |
Check the pH and the conductivity of the effluent before applying the sample to make sure the column is properly equilibrated. Continue to equilibrate with start buffer if necessary. |
Column over-loaded |
Decrease the amount of sample or increase the amount of chromatography medium. I.e. increase the margin of safety. We recommend a margin of safety of approximately 10 %. |
For ion exchange chromatography - Ionic strength of the sample too high or pH incorrect |
Check and adjust the ionic strength and/or pH. Calibrate your conductivity and pH meters. |
Incorrect buffer pH |
Check and adjust the pH. Calibrate your pH meter. |
Oppositely-charged detergents or other additives adsorbed to the column |
Clean the column and chromatography medium according to instructions |
Protein precipitated on the column |
If the protein is initially solubilized with special additives, ensure that these are present during chromatography. Also check pH and ionic strength. |
Too low salt concentration in the elution buffer |
Check and adjust elution buffer composition. |
Strange peaks
| Possible cause | Suggested remedy |
|---|---|
Leakage of non-eluted protein due to poor cleaning-in-place |
Clean and regenerate the column and chromatography medium according to instructions. |
Unwashed buffer tanks |
Clean the tanks and prepare fresh solutions. |
| Possible cause | Suggested remedy |
|---|---|
Air inadvertently injected with the sample. |
Try to remove air bubbles by washing extensively with solution at high flow velocity. Run in upward flow direction. |
Column and/or solution subjected to sudden temperature changes |
Equilibrate the column and solutions to working temperature before use. |
Sample not completely dissolved in buffer |
Ensure that the sample is completely dissolved before applying it to the column. |
System effects, valve-switching, dead volumes, etc. cause uneven buffer velocity |
Minimize if possible. Accept the remaining effects. |
Unsatisfactory elution
| Possible cause | Suggested remedy |
|---|---|
Sample not properly equilibrated |
Equilibrate sample to correct operating conditions (pH, ionic strength, etc.) |
Column not properly equilibrated |
Re-equilibrate the column. |
| Possible cause | Suggested remedy |
|---|---|
Column poorly packed |
Evaluate the packing using recommended methods. If the results are poor, refer to the symptom ‘Poor packing evaluation’. |
Elution strength too low |
Check and adjust the elution strength. Also check gradient, gradient shape or isocratic step. |
| Possible cause | Suggested remedy |
|---|---|
Column is bleeding from the previous run |
Check and adjust your cleaning procedure. Clean the equipment and chromatography medium according to instructions |
Target protein not stable under the chosen conditions and partly degrades |
Find better ways to stabilize the protein, e.g. shorten the process time. |
The detergent has formed micelles with the protein, thereby increasing its size and changing its elution position. This effect is especially critical in gel filtration |
Reduce the concentration of detergent to below it´s critical micelle concentration (CMC ) value. |
| Possible cause | Suggested remedy |
|---|---|
Components in the sample displace the target molecule before elution starts |
Reduce the amount of sample or find more suitable binding conditions. |
Column not properly equilibrated |
Check the pH and conductivity of the effluent before applying the sample. Continue to equilibrate with start buffer if necessary. |
| Possible cause | Suggested remedy |
|---|---|
Column overloaded |
Decrease the amount of sample or increase the amount of chromatography medium. I.e. increase the margin of safety. We recommend a margin of safety approximately 10 %. |
Flow velocity too high |
Run the separation at a lower flow velocity. This is especially important for adsorbents that bind several substances and where selectivity is low. |
Microbial growth in the column |
Microbial growth rarely occurs in a column during use. However, always take steps to prevent infection of packed columns and solutions. Store the column according to instructions. |
Slope of gradient too steep |
Use a shallower gradient (larger gradient volume) |
| Possible cause | Suggested remedy |
|---|---|
Buffers have wrong pH, ionic strength or solvent concentration |
Check and adjust the buffer conditions. Calibrate your instruments. |
| Possible cause | Suggested remedy |
|---|---|
Column overloaded |
Decrease the amount of sample or increase the amount of chromatography medium. I.e. increase the margin of safety. We recommend a margin of safety of approximately 10 %. |
For ion exchange chromatography - Ionic strength of the sample too high or pH incorrect |
Check and adjust the ionic strength and/or pH. Calibrate your conductivity and pH meters. |
For ion exchange chromatography - Reduced net charge due to complex between the component in the sample and the target molecule. |
Check the composition of the sample. Remove any interfering compounds such as nucleic acids. |
Oppositely –charged detergents or other additives adsorbed on the column. |
Clean the column and chromatography medium according to instructions. |
pH of the sample incorrect |
Check and adjust the pH. Calibrate your pH meter. |
The column not properly equilibrated |
Check the pH and conductivity of the effluent before applying the sample. Continue to equilibrate with start buffer if necessary. |
Unusual column appearance
| Possible cause | Suggested remedy |
|---|---|
Column and chromatography medium not correctly cleaned |
Clean the column and chromatography medium according to instructions. Replace the bed supports with new ones if necessary. |
Column not stored under bacteriostatic conditions |
Include a bacteriostatic agent in the storage solution, e.g. 20% ethanol or 10 mM NaOH. |
Connectors not correctly tightened |
Check and tighten if necessary. |
Top adaptor sealing loose and/or supernatant above the seal no longer contains 20% ethanol. |
Always ensure that the seal is tight and that the supernatant above the seal contains 20% ethanol. |
| Possible cause | Suggested remedy |
|---|---|
Bed support damaged or incorrectly assembled allowing chromatography medium particles to leave the column |
|
Buffer conditions deviate with regard to temperature, conductivity, viscosity, content of organic solvent (reduces surface tension) or other factor |
Check the buffers and choose more suitable conditions. |
Increased resistance to flow due to blocked bed support compressing the packed bed |
Clean or change the bed support. Disassemble the column and replace the support according to instructions. Preventive action: |
Poorly packed bed (not sufficiently compressed during packing) |
Evaluate the packing using recommended methods. If the results are poor, refer to the symptom ‘Poor packing evaluation’. |
| Possible cause | Suggested remedy |
|---|---|
Buffer volume of the air trap inadequate |
The column must generally be repacked. However, you can remove a small amount of air trapped between the column top bed support and the top adaptor head by pumping a solution with a temperature a few degrees centigrade higher than the chromatography medium through the column. Use upward flow. If the flow has been reversed, re-evaluate the packing prior to use. Evaluate the packing using recommended methods. If the results are poor, refer to the symptom `Poor packing evaluation´ Preventive action: Check that the size of the air trap corresponds to the flow velocity. Also check that the buffer volume in the air trap is adequate. |
Buffers and column at different temperatures |
The column must generally be repacked. However, you can remove a small amount of air trapped between the column top bed support and the top adaptor head by pumping a solution with a temperature a few degrees centigrade higher than the chromatography medium through the column. Use upward flow. If the flow has been reversed, re-evaluate the packing prior to use. Evaluate the packing using recommended methods. If the results are poor, refer to the symptom ` Poor packing evaluation´ Preventive action: Equilibrate column and solutions to the working temperature before use. |
Connectors not correctly tightened or not compatible with each other |
The column must generally be repacked. However, you can remove a small amount of air trapped between the column top bed support and the top adaptor head by pumping a solution with a temperature a few degrees centigrade higher than the chromatography medium through the column. Use upward flow. If the flow has been reversed, re-evaluate the packing prior to use. Evaluate the packing using recommended methods. If the results are poor, refer to the symptom "Poor packing evaluation" Preventive action: Tighten connectors prior to use. Also check that they are compatible with each other. Please see the connector guides. |
The column operates at room temperature after having been stored in a cold room |
Allow thermal equilibration before use. |
Valves that should be closed are not shut tightly |
The column must generally be repacked. However, you can remove a small amount of air trapped between the column top bed support and the top adaptor head by pumping a solution with a temperature a few degrees centigrade higher than the chromatography medium through the column. Use upward flow. If the flow has been reversed, re-evaluate the packing prior to use. Evaluate the packing using recommended methods. If the results are poor, refer to the symptom ‘Poor packing evaluation’. Preventive action: |
Worrying peak shape
| Possible cause | Suggested remedy |
|---|---|
Column poorly packed |
Evaluate the packing using recommended methods. If the results are poor, refer to the symptom ‘Poor packing evaluation’. |
Protein precipitated on the bed supports and/or in the bed. |
Clean and regenerate the column and chromatography medium according to instructions. |
| Possible cause | Suggested remedy |
|---|---|
Column over-loaded |
Decrease the amount of sample or increase the amount of chromatography medium. I.e. increase the margin of safety. We recommend a margin of safety of approximately 10 %. |
| Possible cause | Suggested remedy |
|---|---|
Column poorly packed |
Evaluate the packing using recommended methods. If the results are poor, refer to the symptom ‘Poor packing evaluation’. |
Protein precipitated on the bed supports and/or in the bed |
Clean and regenerate the column and chromatography medium according to instructions. |
| Possible cause | Suggested remedy |
|---|---|
Column poorly packed |
Evaluate the packing using recommended methods. If the results are poor, refer to the symptom ‘Poor packing evaluation’. |
For reversed phase chromatography - Organic solvents have denatured the protein. |
Use a higher flow velocity and/or an adapted gradient to shorten residence time on the column and thus minimize exposure. |
Gradient slope or isocratic step too shallow |
Increase steepness of gradient or isocratic step. |
Protein precipitated on the bed supports and/or in the bed |
Clean and regenerate the column and chromatography medium according to instructions |
| Possible cause | Suggested remedy |
|---|---|
Column poorly packed |
Evaluate the packing using recommended methods. If the results are poor, refer to the symptom ‘Poor packing evaluation’. |
Protein precipitated on the bed supports and/or in the bed |
Clean and regenerate the column and chromatography medium according to instructions |
| Possible cause | Suggested remedy |
|---|---|
Column poorly packed |
Evaluate the packing using recommended methods. If the results are poor, refer to the symptom ‘Poor packing evaluation’. |
Protein precipitated on the bed supports and/or in the bed |
Clean and regenerate the column and chromatography medium according to instructions. |