Pronunciation: an′ī-on eks-chānj′ĕr
Definition: An insoluble solid, usually a polystyrene or a polysaccharide, with cation groups (—NR3+ or —NR2H+), which can attract and hold anions that pass by in a moving solution in exchange for anions previously held.
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Examples: glitazone, GI cocktail, etc.
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