The ion-exchange behavior of three kinds of neutral amino acids was examined and the following results were obtained. 1) The ion-exchange behavior of amino acids can be explained when the dissociation equilibrium of amino acids in the solution was taken into account. 2) The maximum adsorption of neutral amino acids on the ion-exchange resins takes place in a rather broad pH range at the iso-electric point. 3) The neutral amino acids are adsorbed more extensively on cation-exchangers than on anion-exchangers. Glycine is adsorbed most extensively and leucine is more adsorbed than alanine.
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o et al. (1960) studied this question.
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