Ion exchange resin

Ion exchange resins are insoluble, cross-linked synthetic polymers—most commonly based on styrene-divinylbenzene or acrylic matrices—functionalized with specific charged groups (e.g., sulfonic acid, carboxylic acid, or quaternary ammonium) that act as stationary phases capable of reversibly exchanging ions from an environmental or diagnostic solution[1][2][3][7]. They are widely used for water purification, softening, biochemical separations (e.g., ion exchange chromatography), and, in some cases, as orally administered drugs for binding ions in the gastrointestinal tract (e.g., sodium polystyrene sulfonate for hyperkalemia, cholestyramine for bile acid sequestration)[3][7]. While critical to chemical, clinical, and industrial applications, ion exchange resins are not biological receptors, enzymes, or 'targets' in the pharmacological sense[2][3][4][7]. If you require information about a specific drug that interacts with ion exchange resins, such as sodium polystyrene sulfonate (often called "kayexalate"), or a specific type of resin used in medical or analytical practice, please clarify the request.

Other names

Ion-exchange polymerionexIX resinion-exchangerion exchange polymer

Ion exchange (resins exchange their fixed counter-ions for ions in solution, e.g., sodium ions for potassium in the gut in the case of polystyrene sulfonate)