Purification & Detection

Focurose 200PG

Catalog # Size Price Quantity
V2006 100 mL $528.00
V2007 250 mL $990.00
V2008 1 L $3,300.00
V2005 25 mL $198.00

Product Introduction

Focurose 200PG is a size exclusion resin suitable for fine purification of biomolecules and buffer exchange in laboratory and industrial-scale production.


  • High pressure resistance, fast flow rate.
  • Small particle size, high resolution.
  • Excellent compatibility, can withstand more stringent cleaning conditions.

Focurose 200PG Performance Parameters


Highly cross-linked agarose and dextran

Particle size range 

25-45 µm

Average particle size (D50)

35±5 µm

Separation Range (Globular Proteins)

10-600 kDa

pH stability

3-12 (long-term), 1-14 (short-term)

Chemical stability

Compatible with commonly used solutions such as 8M urea, 6M guanidine hydrochloride, 70% ethanol, 1M sodium hydroxide

Storage solution

20% ethanol

Storage conditions


Frequently Asked Questions and Solutions


Possible Causes


Target protein does not bind or has low binding capacity during purification

Overloading of sample

Reduce the sample load

Sample flow rate is too fast

Reduce the sample flow rate and load the sample according to a retention time of 4-6 minutes

Protein or lipids aggregate in the resin, affecting binding

Efficiently clean the resin or replace with a new resin

Weak binding between target molecule and resin

Confirm the source and subtype of IgG and select the appropriate resin

Inappropriate choice of buffer during purification

Confirm the pH of the sample, and for weakly binding target molecules, increase the pH (8-9) and salt concentration (1-3M NaCl) to enhance the binding between the sample and resin

Not collecting the target protein during elution or collecting only a small amount of the target protein.

Target protein does not bind to the resin or has low binding capacity

First, confirm if the target protein binds to the resin

Unsuitable elution conditions

Optimize elution conditions to increase elution strength

Insufficient elution time

Lower the flow rate and extend the retention time of the elution buffer

Elution volume is too small

Increase elution volume, generally recommended 3CV

Target protein purity is low

Unreasonable sample pre-processing

Based on the sample source, it is recommended to perform filtering or dilution before column loading

The sample has high viscosity

Dilute the sample appropriately with a balancing solution to reduce sample viscosity and concentration

Incomplete removal of impurities

Optimize the washing conditions to remove impurities

Impurities such as proteins or lipids aggregate and precipitate in the resin

Clean the resin promptly and effectively

Degradation of the target substance

Determine the possibility of degradation of the target substance in process conditions or components. Pay attention to the storage conditions of the sample before and after purification

Poor column packing

Reload or use new packing material

Microbial growth in the resin

After using the resin, clean and disinfect it promptly, and store the resin properly


Decrease in resin loading

Too fast sample flow rate

Reduce the sample flow rate

Aggregation of proteins or lipids in the resin resulting in decreased loading


Clean the resin promptly

Gradual detachment of ligands

Optimize process conditions and replace with new resin

Peak fronting

Resin is packed too tightly or the solid-to-liquid ratio is high

Adjust column parameters and repack the column

Peak tailing

Resin is packed too loosely or the solid-to-liquid ratio is low

Adjust column parameters and repack the column

Cracks or dryness in the column bed

Leakage or introduction of large air bubbles

Check for leaks or bubbles in the tubing and repack the column if necessary

Slow liquid flow

Aggregation of proteins or lipids

Clean the resin or membrane promptly

Microbial growth in the separation column

All reagents used must be filtered and degassed. The sample must be centrifuged or filtered before applying it to the column