Ion exchange packingIt is a key material used for separating and purifying charged molecules, widely used in fields such as biopharmaceuticals, food, chemical analysis, etc. It achieves selective adsorption and separation of target molecules through reversible exchange between functional groups and ions in solution.

Basic composition: It mainly consists of a packing base frame and a matching base. The base frame is an inert support structure, commonly including styrene divinylbenzene copolymer, acrylic ester polymer, cross-linked agarose, etc; The ligand is a charged group attached to the base frame, which determines the ion exchange performance of the filler.

Working principle: Separation is carried out based on the difference in charge carried by the sample in a buffer solution with a specific pH value. When the pH value of the buffer solution in which the sample is located is lower than its isoelectric point, the sample is positively charged and can bind with negatively charged ligands on cation exchange fillers; On the contrary, the sample is negatively charged and binds to the positively charged ligands on the anion exchange filler. By adjusting the pH and conductivity of the buffer system, the separation of target molecules from impurities can be achieved.

　　Ion exchange packingKey performance parameters:

1. Loading capacity: The amount of target molecules adsorbed by a unit volume of filler, and high loading capacity can improve purification efficiency.

2. Resolution: The ability to separate similar molecules, influenced by the particle size, pore size, and functional group density of the filler.

3. Pressure resistance: Polymer matrix fillers have better pressure resistance than polysaccharide matrix and are suitable for high-pressure preparation.

4. Chemical stability: Resistant to acid, alkali, and organic solvent cleaning, extending the lifespan of fillers.

5. Biocompatibility: Reduce non-specific adsorption and improve the recovery rate of target molecules.