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Ion-exchange resin beads. An ion-exchange resin or ion-exchange polymer is a resin or polymer that acts as a medium for ion exchange, that is also known as an ionex. [1] It is an insoluble matrix (or support structure) normally in the form of small (0.25–1.43 mm radius) microbeads, usually white or yellowish, fabricated from an organic polymer substrate.
These resins are prepared preswollen [3] although cellulose exchangers swell in a strong basic environment to increase access to binding sites. [4] DE52 has a pKa of 11.5. [citation needed] The buffering range for diethanolamine is 8.4-8.8, though the range for DEAE-C varies between manufacturers. [5]
Anion-exchange chromatography is a process that separates substances based on their charges using an ion-exchange resin containing positively charged groups, such as diethyl-aminoethyl groups (DEAE). [2] In solution, the resin is coated with positively charged counter-ions . Anion exchange resins will bind to negatively charged molecules ...
Some examples of functional groups of strong ion exchange resins are quaternary ammonium cation (Q), which is an anion exchanger, and sulfonic acid (S, -SO 2 OH), which is a cation exchanger. [34] These types of exchangers can maintain their charge density over a pH range of 0–14.
Ion-exchange resin beads Ion-exchange column used for protein purification. Ion exchange is a reversible interchange of one species of ion present in an insoluble solid with another of like charge present in a solution surrounding the solid. Ion exchange is used in softening or demineralizing of water, purification of chemicals, and separation ...
The resin has a higher affinity for highly charged countercations, for example by Ca 2+ (calcium) in the case of water softening. Correspondingly, anion-exchange resins are typically provided in the form of chloride Cl −, which is a highly mobile counteranion. Counterions are used in phase-transfer catalysis.