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2. Ion-exchange resin - Wikipedia

   en.wikipedia.org/wiki/Ion-exchange_resin

   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.

3. Ion exchange - Wikipedia

   en.wikipedia.org/wiki/Ion_exchange

   Strong acid cation (SAC) resins: Composed of a polystyrene matrix with a sulphonate (SO 3 −) functional group. Used in softening or demineralization processes. Weak acid cation (WAC) resins: Composed of an acrylic polymer and carboxylic acid functional groups. Used to selectively remove cations associated with alkalinity.

4. Diethylaminoethyl cellulose - Wikipedia

   en.wikipedia.org/wiki/Diethylaminoethyl_cellulose

   DEAE-C is a weak anion exchanger. This exchange is utilized to separate proteins that have faintly differing charges. Like all anion exchangers, the resin carries a positive charge that interacts favorably with negative charges. The positive charge of DEAE cellulose is due to a protonated amine group.

5. Multicolumn countercurrent solvent gradient purification

   en.wikipedia.org/wiki/Multicolumn_countercurrent...

   The second application example for the MCSGP prototype is the separation of three MAb variants using a preparative weak cation-exchange resin. Although the intermediately eluting MAb variant can only be obtained with 80% purity at recoveries close to zero in a batch chromatographic process, the MCSGP process can provide 90% purity at 93% yield.

6. Chelating resin - Wikipedia

   en.wikipedia.org/wiki/Chelating_resin

   Chelating resins have the same bead form and polymer matrix as usual ion exchangers. Their main use is for pre-concentration of metal ions in a dilute solution. Chelating ion-exchange resins are used for brine decalcification in the chlor-alkali industry, the removal of boron from potable water, and the recovery of precious metals in solutions.

7. Mixed-mode chromatography - Wikipedia

   en.wikipedia.org/wiki/Mixed-mode_chromatography

   [11] In 2009, Geng’s group first achieved online two-dimensional (2D) separation of intact proteins using a single column possessing separation features of weak-cation exchange chromatography (WCX) and HIC (termed as two-dimensional liquid chromatography using a single column, (2D-LC-1C). [12]

8. Counterion - Wikipedia

   en.wikipedia.org/wiki/Counterion

   Ion-exchange resins are polymers with a net negative or positive charge. Cation-exchange resins consist of an anionic polymer with countercations, typically Na + (sodium). The resin has a higher affinity for highly charged countercations, for example by Ca 2+ (calcium) in the case of water softening.

9. Conductivity (electrolytic) - Wikipedia

   en.wikipedia.org/wiki/Conductivity_(electrolytic)

   For example, in the boiler water technology, the boiler blowdown is continuously monitored for "cation conductivity", which is the conductivity of the water after it has been passed through a cation exchange resin. This is a sensitive method of monitoring anion impurities in the boiler water in the presence of excess cations (those of the ...