Blue Agarose Resin is an affinity chromatography medium used for the purification of albumin, interferon, nucleotide-dependent enzymes, α2-macroglobulin, coagulation factors, etc. Blue Affinity Chromatography Medium is based on a highly cross-linked 6% agarose matrix, which can withstand relatively high flow rates, offers higher chemical stability, and is suitable for large-scale purification.
Aladdin Blue Agarose Resin is stored in 0.1 M K₃PO₄, 20% ethanol, pH 8.0, with a settled gel to storage solution ratio of 1:1. The product specification refers to the actual volume of the settled gel.
Specification
| Indicator
|
Matrix
| Highly cross-linked 6% agarose microspheres
|
Ligand
| Cibacron Blue 3G, approx. 7 µmol/mL medium
|
| Particle Size Range | 45 - 165 µm |
Binding Capacity
| >18 mg Bovine Serum Albumin / mL medium
|
| Maximum Pressure Tolerance | 0.3 MPa, 3 bar
|
pH Stability Range
| 4-12 |
Storage
| 0.1 M K₃PO₄, 20% ethanol, pH 8.0, 2~8°C
|
Shelf Life
| 2 years |
Instructions for Use
1. Buffer Preparation
It is recommended to filter all water and buffers using a 0.22 µm or 0.45 µm filter membrane before use.
Using Human Serum Albumin (HSA) purification as an example:
Equilibration/Wash Buffer: 50 mM Na₂HPO₄, 50 mM Sodium Citrate, pH 7.0
Elution Buffer: 50 mM Na₂HPO₄, 50 mM Sodium Citrate, 1-2 M NaCl, pH 7.0
Note: The binding and elution buffers can be adjusted appropriately based on the sample properties. The general principle is low salt concentration for binding and high salt concentration for elution.
2. Sample Preparation
It is recommended to centrifuge the sample or filter it through a 0.22 µm or 0.45 µm filter membrane before loading to reduce impurities, improve purification efficiency, and prevent column clogging.
3. Packing the Blue Affinity Chromatography Medium
3.1 Gravity Column Packing
(1) Take a gravity column of appropriate size, insert the bottom frit, add an appropriate amount of pure water to rinse the column tube and frit, and close the bottom outlet.
(2) Mix the Blue Agarose Resin uniformly. Using a pipette tip, aspirate an appropriate amount of the slurry and add it to the gravity column (the settled medium volume constitutes half of the suspension volume). Open the bottom outlet to drain the storage solution.
(3) Add an appropriate amount of pure water to rinse the medium. After the liquid in the column has drained by gravity, close the bottom outlet.
(4) Insert the rinsed top frit, ensuring no gap between the frit and the medium and that it remains level.
(5) The packed gravity column can be equilibrated directly by adding equilibration buffer. When not in use immediately, add storage solution and store at 2-8°C.
3.2 Medium-Pressure Chromatography Column Packing
Blue Agarose Resin is widely used in industrial purification, thus involving the packing of various medium-pressure chromatography columns. The method for packing a chromatography column is described below.
Before packing, calculate the cross-sectional area of the column based on its diameter, and calculate the required medium volume based on the desired bed height using the formula:
V = 1.15 × π × r² × h
V: Required medium volume (mL)
1.15: Compression factor
r: Column inner radius (cm)
h: Packed bed height (cm)
Note: The volume of suspension taken should be twice the calculated medium volume (V), because the settled medium volume constitutes only half of the total suspension volume; the other half is storage solution.
(1) Rinse the column bottom sieve plate and adaptor with deionized water. Ensure no bubbles are trapped under the bottom sieve plate. Close the column outlet, leaving 1-2 cm of deionized water in the bottom of the column.
(2) Resuspend the medium. Carefully pour the slurry continuously into the column. Pouring the slurry along the column wall using a glass rod can help reduce bubble formation.
(3) If using a reservoir, immediately fill both the column and the reservoir with water. Place the inlet adaptor on the slurry surface and connect it to the pump, avoiding air bubbles in the adaptor or inlet tubing.
(4) Open the column outlet and start the pump at the set flow rate. Initially, allow the buffer to flow through the column slowly, then gradually increase to the final packing flow rate. This avoids hydraulic on the forming bed and prevents uneven packing. If the recommended pressure or flow rate cannot be achieved, using the maximum flow rate of your pump can also yield a good packing result. (Note: In subsequent chromatography runs, do not exceed 75% of the maximum packing flow rate.) When the bed height stabilizes, continue pumping at least 3 bed volumes (BV) of deionized water at the final packing flow rate. Mark the final bed height.
(5) Turn off the pump and close the column outlet.
(6) If a reservoir was used, remove it and position the inlet adaptor within the column tube.
(7) Carefully push the adaptor down to the marked bed height. Allow the packing buffer to enter the adaptor, then tighten the adaptor lock nut.
(8) Connect the packed column to the pump or chromatography system and begin equilibration. Readjust the adaptor if necessary.
4. Sample Purification
4.1 Batch/Binding Procedure
(1) According to the sample volume, transfer an appropriate amount of Blue Affinity Chromatography Medium to a centrifuge tube. Centrifuge at 1000 rpm for 1 min and aspirate the supernatant. Alternatively, add the medium to a gravity column and drain the storage solution.
(2) Add 5 volumes of equilibration buffer (relative to the medium volume) to wash the medium. Centrifuge at 1000 rpm for 1 min and aspirate the supernatant. If using a gravity column, wash directly in the column by draining the equilibration buffer. Repeat this wash step more than twice.
(3) Add the sample. Seal the centrifuge tube or gravity column. Incubate with shaking for 2-4 hours at 4°C or for 30 min - 2 hours at 37°C.
(4) After incubation, centrifuge at 1000 rpm for 1 min and aspirate the supernatant, or filter to collect the medium. Retain the supernatant as the flow-through for SDS-PAGE analysis.
(5) Wash the medium with 5 volumes of wash buffer. Centrifuge at 1000 rpm for 1 min or filter using the gravity column, and remove the supernatant (be careful not to aspirate the medium). Repeat this wash 3-5 times; it is advisable to change to a new centrifuge tube during the process.
(6) Add 3-5 volumes of elution buffer for elution. Incubate at room temperature for 5 min. Centrifuge at 1000 rpm for 1 min or collect the eluate from the gravity column. This elution step can be repeated 2-3 times.
4.2 Gravity Column Procedure
(1) Equilibrate the packed Blue Affinity Chromatography Medium gravity column with 5 column volumes (CV) of equilibration buffer. Repeat 2-3 times to ensure the medium is in the same buffer system as the target protein.
(2) Load the sample onto the equilibrated column. Allow the sample to remain in contact with the medium for at least 2 minutes to ensure sufficient binding. Collect the flow-through. Reloading the flow-through can increase binding efficiency.
(3) Wash the column with 10-15 CV of wash buffer to remove non-specifically bound impurities. Collect the wash fraction.
(4) Elute the bound protein using 5-10 CV of elution buffer. Collect the eluate in fractions (e.g., 1 CV per tube) and analyze them separately. This ensures complete elution of the bound target protein while obtaining high purity and concentration.
4.3 Medium-Pressure Column Procedure
After the Blue Affinity Chromatography Medium is packed, it can be used with conventional medium/low-pressure chromatography systems.
(1) Prime the pump tubing with deionized water. Remove the top cap, connect the column to the chromatography system, open the bottom outlet, and secure the connection.
(2) Flush out the storage buffer with 3-5 CV of deionized water.
(3) Equilibrate the column with at least 5 CV of equilibration buffer.
(4) Load the sample using a pump or a sample loop. Note: Increased sample viscosity can lead to high backpressure even with small sample volumes. Do not exceed the binding capacity of the column. Large sample volumes can also cause high backpressure, making injector use more difficult.
(5) Wash the column with wash buffer until the UV absorbance reaches a stable baseline (typically at least 10-15 CV).
(6) Elute with 5-10 CV of elution buffer. Collect the eluate, which contains the target protein. After elution, wash the column with 5-10 CV of equilibration buffer, followed by 5-10 CV of deionized water. Finally, wash with 2 CV of 20% ethanol for storage. Store at 2-8°C.
5. SDS-PAGE Analysis
Analyze the samples obtained from the purification process (including flow-through, wash, and elution fractions) as well as the original crude sample using SDS-PAGE to evaluate the purification effectiveness.
6. Medium Cleaning
Blue Affinity Chromatography Medium can be reused multiple times without mandatory regeneration. However, the accumulation of non-specifically bound proteins and protein aggregates can lead to decreased flow rates and binding capacity. The following cleaning procedures can be performed when necessary.
To remove precipitated or denatured substances, the following method is recommended:
Wash with 3-4 CV of 0.1 M NaOH, followed by 3-4 CV of 70% ethanol or 2 M potassium thiocyanate solution. Then, immediately equilibrate with 5 CV of binding buffer.
To remove non-specifically bound substances caused by hydrophobic adsorption:
Wash with 3-4 CV of 70% ethanol, or 30% isopropanol, or 1% Triton™ X-100. Then, immediately equilibrate with 5 CV of binding buffer.
