Abstract
The heats of adsorption from aqueous solutions of cephalosporin-C, d,l-trytophan, d,l-phenylalanine and d,l-tyrosine on XAD-2 resin have been investigated using high pressure liquid chromatography (HPLC). The amino acids were adsorbed from phosphate-buffered aqueous solutions. The pH range studied was 3.3 – 7.5, the temperature range was 291.15 – 313.15 K and the ionic strength was maintained at 0.1 M. Over the range of variables investigated the adsorption isotherms are linear and can be characterized by temperature and pH dependent apparent adsorption equilibrium constants, characteristic of the adsorbent-adsorbate system. By studying the dependence on temperature of this adsorption constant, heats of adsorption at small surface coverages have been estimated. In terms of the heat liberated on adsorption, the amino acids can be ranked thus: cephalosporin-C > d,l-tryptophan > d,l-tyrosine > d,l-phenylalanine.
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