Seplife® LXMS 15QN Ion Exchange Resin (DVB)

Synthetic Chromatography Resins

Appearance: White to light yellow spherical beads
Type: Strong anion exchange resin
Matrix: Polystyrene/DVB
Ligand: Quaternary Amine
Ion exchange capacity (mmol/ml): 0.15-0.20
Particle size (μm): 15±2
Pore ​​size (nm): 55±10
pH stability: 2-12 (operation), 1-14 (CIP)
Chemical stability: All common ion exchange buffers. CIP: up to 1M NaOH
Pressure flow rate (cm/h)*: 100-600
Dynamic capacity (mg/ml, BSA)**: All common ion exchange buffers. CIP: up to 1M NaOH
Maximum Pressure resistance: 4.0 MPa / 40 Bar
Shipped as: 20% ethanol slurry

*Testing conditions: chromatography column 10mm×100mm; Column bed height 100mm
** Testing conditions: Column: ID 10mm×100mm, Binding buffer: 20mM Tris-HCl, pH7.0, Elution buffer: 20mM Tris-HCl, 1M NaCl, pH7.0, Sample: BSA 5mg/ml, 150cm/h

The Seplife® LXMS 15QN resin is supplied as a 50-60 % (v/v) slurry in 20% ethanol solution. The use of a high ionic strength mobile phase for resin packing into the chromatographic column (including cleaning and disinfection) is preferred ; it is recommended to use 0.5 M NaCl; 0-20% ethanol solution can also be suitable. The recommended slurry concentration for column packing is 50-60% (v/v).
• Gently mix the resins to form a homogeneous slurry and transfer the desired mass or volume to the buffer exchange vessel. A volume of resin of approx. 1.2 times more than the desired column packed volume should be used.
• Before loading the column, adjust the homogenate concentration to 50-60 % with 0.5 M NaCl or 0-20% ethanol solution; pour the entire homogenate volume into the chromatography column at one time.
• Load the distribution plate and adjust the height, then start the pump and stabilize the column bed with 1.5 to 2 times the working flow rate or gradually increase the flow rate to reach a final pressure of 7-25 bar.
• Mark the bed height after the column bed is stabilized and adjust the height so that the compression coefficient is 1.05-1.10.

Column Efficiency Evaluation
Equilibrate the chromatographic column with mobile phase of 0.5M NaCl solution at a flow rate of 100-120cm/h for 5-10CV. Test the column efficiency using a mobile phase of 0.5M NaCl solution and injecting 0.5-1% column volume of 2M NaCl solution at 100-120cm/h flow rate. Using the conductivity detector, record the chromatogram and calculate the peak asymmetry and the theoretical plate number. Typically, the number of plates is ≥9000/m, and the asymmetry factor is 0.8-1.5.

Rinsing
The packed columns should be rinsed with a minimum 5 CV of buffer.
EquilibrationAfter packing the column, equilibrate with the mobile phase first, with 5-10 column volumes, and control the flow rate at 120-300cm/h until the conductivity and pH of the flow-through remain unchanged before feeding the sample.

Sample loading
If the sample is in solid form, it can be prepared by dissolving in the equilibration buffer; a low-concentration sample solution should be concentrated in advance as much as possible; a high concentration sample solutions should be diluted with equilibration buffer. To avoid clogging of the column, samples should be processed by centrifugation or membrane filtration. The feed amount is calculated according to the capacity of the resin and the content of the target molecule in the feed solution. Before loading, make sure that the sample buffer should be as consistent as possible with the equilibration buffer.

Elution
After loading the sample, continue rinsing with equilibration buffer until the baseline is stable. According to the actual situation, elute the samples adsorbed on the resin sequentially by increasing the salt concentration or changing the pH of the mobile phase.

Regeneration and CIP
Regular Cleaning-In-Place (CIP) can prevent column fouling, and help to maintain the capacity and resolution of the chromatographic media. Specific CIP methods and the frequency of CIP need to be designed for each process according to the type of contamination. The recommended regeneration and CIP method is as follows: Rinse the column up-flow with 5 CV of 1-2 M NaCl followed by 5 CV of 0.5-1 M NaOH.

Storage
Chromatography resins in bulk that are not for immediate use should be stored in 20% ethanol at 2-30°C. The column packed with Seplife® LXMS 15QN, after regeneration, CIP and sanitization should be stored in a buffer solution containing 20% ethanol preferable at neutral pH.