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Protein A Resins

Protein A Captarose HL is prepared by coupling a robust alkaline-resistant Protein A ligand to a high-rigidity agarose matrix. This resin exhibits excellent ligand stability, minimal ligand leaching during purification, and facilitates easy removal of residual ligands in downstream processes. It can be efficiently cleaned in place (CIP) with 0.1⁓0.5M NaOH, eliminating the need for expensive and corrosive CIP reagents, thereby providing cost savings. It also offers good flow rates, pressure tolerance, and scalability, making it an ideal choice for monoclonal antibody purification.

Features High loading capacity, strong alkali resistance, fast flow rate

Product Type Prepacked columns, Resins

Pack Size 1mL 5mL 10mL 25mL 100mL 500mL 1L 5L 10L

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DetailOrder InformationDocuments

Product	Protein A Captarose HL
Features	High loading capacity, strong alkali resistance, and fast flow rate
Application	Purification of Monoclonal Antibodies and Fc-Fusion Proteins
Matrix	High-rigidity agarose
Particle size	75 μm
Functional group	Recombinant alkali resistant protein A(E.coli)
Capacity	＞55mg human IgG/mL resin
Flow velocity	＜500 cm/h
Max. pressure	＜0.5 MPa
pH stability	3-12(operational), 2-14(CIP, short term）
Chemical stability	Good Stability at pH 2⁓9, 6M Guanidinehydrochloride tolerable, 8M Urea, 0.5M NaOH
Storage conditions	20% ethanol；2-8℃

Pack size	Cat. No.
Pack size	Protein A Captarose HL
1ml XTrap Prepacked columns	HC1010011
5ml XTrap Prepacked columns	HC1010012
5ml XScreen Prepacked columns	HC1010013
10ml	HC1010000
25ml	HC1010001
100ml	HC1010002
500ml	HC1010003
1L	HC1010004
5L	HC1010005
10L	HC1010006

Operation Guide

1. Column Packing

1.1 Preparation of PackingBuffer

Use purified water, degassed bysonication for 15 min.

1.2 Preparation ofChromatography Medium

Calculate the required amount ofmedium (compression factor approx. 1.15) and weigh it. Exchange the medium intothe packing buffer using a vacuum filtration flask. Add a sufficient volume ofpacking buffer to the exchanged medium to prepare an approximately 50% slurry.

1.3 Column Preparation

Inspect the column to ensure allcomponents are complete and clean. Install the bottom adapter, tighten theO-ring, and mount the column vertically on a laboratory stand. Use a level tocheck and adjust the column to ensure it is perfectly vertical. Using a syringefilled with packing buffer, connect it to the bottom outlet port and slowlyinject the buffer to remove air bubbles from the bottom net. Remove the syringeand close the port with a plug. Add packing buffer to the column to a height ofapproximately 2 cm.

1.4 Packing Procedure（Example using a 16 mm diameter column with a target bed height of 10cm）

Mix the medium slurry well and pour it slowly into the column usinga glass rod as a guide. If the liquid level is below the column top, add morepacking buffer to fill it. Connect the flow adapter to the chromatographysystem. Start the pump at a specific flow rate to remove air bubbles from thetubing and the adapter net, then pause the pump. Insert the adapter into thecolumn at a 45° angle, position it, secure it, and tighten the sealing ring,ensuring no air bubbles are trapped. Open the bottom plug of the column andplace the bottom tubing into a waste container. Set the flow rate to 750 cm/hand start the pump to pack the column until the bed volume stabilizes. Mark thebed level on the column with a marker. Pause the system. Close the bottom plug.Disconnect the column top from the pump. Slightly loosen the sealing ring onthe adapter and lower the adapter until it is 1-3 mm below the marked bedsurface. Tighten the sealing ring. Connect the column top and bottom to thechromatography system for column efficiency testing.

2. Column EfficiencyTest

Column efficiency should be testedimmediately after packing. Performance is typically assessed using parameterslike the number of theoretical plates per meter (N/m) and the peak asymmetryfactor (As). Higher efficiency indicates better separation capability of thecolumn. To accurately reflect column efficiency, the sample volume should be1.0% of the column volume (CV), and the linear flow rate should be maintainedat 15-30 cm/h during the test. To minimize sample dispersion, inject the sampleas close as possible to the column inlet.

Table2 Column Efficiency Test Methods

Project	Content
Methods	Acetone Method	NaCl Method
Sample	1.0%（v/v）acetone in water	0.8 M NaCl in water
Sample Volume	1.0%CV*	1.0%CV*
Mobile Phase	Water	0.4 M NaCl in water
Flow Rate	30 cm/h	30 cm/h
Detection	UV 280	Conductivity

Note*: CV (Column Volume), hereinafter referredto as CV.

Column Efficiency Calculation

Calculate N/m and As based on the UV(or conductivity) trace using the following formulas:

N/m = N/L

N = 5.54(VR/Wh)²

As=b/a

Note: In the formulas, VR: retentionvolume; Wh: peak width at half height; L: column height (in meters); N: numberof theoretical plates. VR and Wh must be in consistent units. 'a' is the widthof the first half of the peak at 10% peak height; 'b' is the width of thesecond half of the peak at 10% peak height, as shown in Figure 1.

Figure 1. Schematic Diagram for Column Efficiency Calculation

Column efficiency test chromatogram showing retention volume and peak widths

The peak should be symmetrical, with As as close to 1 as possible(typically acceptable values range from 0.8 to 1.8). N/m should be > 4,000.

3. Purification Process

3.1 Column Equilibration

Connect the column to thepurification system. Wash with at least 2-3 CV of Binding Buffer until the pHand conductivity of the column effluent match those of the Binding Buffer.After equilibration, zero the UV monitor (UV 280 nm).

3.2 Sample Loading

Load the sample solution (containingIgG), pre-filtered through a 0.45 µm membrane, onto the column. The loadingvolume depends on the medium's binding capacity, the IgG concentration in thesample, and other chromatographic conditions.

3.3 Column Wash

Wash the column with 3-5 CV ofBinding Buffer to remove unbound impurities (until the UV 280 nm signal returnsto near baseline). Alternatively, use impurity wash conditions determined inprior experiments.

3.4 Elution

Wash the column with Elution Buffer.Begin collecting the eluted sample when the target UV peak starts to rise. Theeluted sample can be neutralized immediately by adding 1/10th volume of aneutralization buffer, such as 1 M Tris-HCl, pH 9.0.

3.5 Cleaning and Storage

Clean the column with 3-5 CV of0.1-0.5 M NaOH. Then wash with Binding Buffer until the effluent pH is neutral.Finally, flush with 2-3 CV of 20% ethanol. Store the column at 4-8°C.

Note: Binding Buffer (e.g., 20 mMPB, 0.15 M NaCl, pH 7.4), filter through 0.2 µm membrane. Elution Buffer (e.g.,pH 3.0-3.5 citrate, acetate, or glycine buffer, such as 40 mM citrate, pH 3.5),filter through 0.2 µm membrane.

4. Cleaning-In-Place (CIP)

Cleaning-In-Place(CIP) is used to remove strongly bound, precipitated, or denatured substancesfrom the chromatography medium. Residual contaminants can impair columnperformance. Severe accumulation can clog the column, increasing backpressureand reducing flow rate. Regular CIP prevents contaminant build-up in the bed,helping to maintain medium capacity, flow properties, etc. Common CIP methodsare as follows:

4.1Wash the column with 3-5 CV of Binding Buffer.

4.2Wash the column with ≥3 CV of 0.1-0.5 M NaOH, with a contact time of 10-15minutes.

4.3Wash the column with 3-5 CV of Binding Buffer.

5. Sanitization

Sanitizationaims to minimize microbial contamination within the column. Due to the highalkali resistance of Protein A Captarose HL, NaOH solution can be used as asanitizing agent. NaOH solutions effectively remove viruses, bacteria, yeast,and endotoxins with very low operating costs. The sanitization procedure is:

5.1Rinse the column with 3-5 CV of Binding Buffer.

5.2Flush the column with 2-5 CV of 0.1-0.5 M NaOH solution.

5.3Soak the column with 0.1 M NaOH solution for 30 minutes (or 0.5 M NaOH for 15minutes).

5.4Rinse the column with 5-10 CV of Binding Buffer (pH 7-8) to complete thesanitization process.

Precautions:

• For heavily contaminatedcolumns, consider cleaning with 0.5 M NaOH mixed with 30-40% isopropanol.

• High concentrations of NaOH orprolonged NaOH exposure can reduce the medium's binding capacity. Pay attentionto the concentration and contact time during sanitization.

6. Storage

Unusedmedium should be stored in a dry, well-ventilated, clean environment at 4-8°C,ensuring the container is tightly sealed. Do not freeze.

Packedcolumns should be stored sealed, submerged in 20% ethanol or 2% benzyl alcoholto prevent microbial growth. Perform a blank run followed by CIP before nextuse.

Toprevent microbial growth due to ethanol evaporation, it is recommended toreplace the storage solution with fresh solution every 3 months.

Note:Before using stored medium, perform CIP and equilibrate with at least 5 CV ofBinding Buffer.

7. Scale-up

Purificationprocesses optimized at laboratory scale can be linearly scaled up to pilot orproduction scale. The following points should be considered during scale-up:

• Maintain constant residencetime to ensure consistent dynamic binding capacity.

• Select column volume based onrequired binding capacity. If bed height is changed, assess the potentialimpact on the purification steps.

• Determine column diameter basedon flow rate requirements. Determine bed height based on known residence time;a bed height of 10-25 cm is generally recommended.

• Ensure uniform sampleconcentration and consistent elution conditions.

Troubleshooting

1. Removal of LeakedLigand

Ligandcoupling in Protein A Captarose HL is highly stable, resulting in minimalleakage during use. The concentration of leaked ligand in the eluate can bemeasured using available kits. Subsequent polishing steps like ion exchangechromatography are effective in removing any trace leaked ligand, ensuring thefinal product meets the specified standard for Protein A concentration.

2. Problem and SolutionSuggestions

Table 3 Problems and Solution Suggestions

Problem	Possible Causes and Suggested Solutions
High pressure during operation	Replace in-line filter.
High pressure during operation	Column clogged; perform CIP.
Unstable pressure profile	Remove air bubbles from the pump.
Unstable pressure profile	Use a bubble trap to remove air from the sample.
Elution peak broadening gradually	Column may be contaminated. Optimize elution conditions and perform strict CIP.
Reduced recovery	Overloading; reduce sample load.
	Precipitation during elution; optimize elution conditions.
	Elution strength insufficient; optimize elution conditions.
Increased CIP peak	CIP conditions insufficient; optimize CIP protocol.
Higher ligand leakage upon first use	Perform a blank run followed by CIP before first use.