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A continuous frontal analysis chromatographic method was developed for studying the simultaneous binding of two drugs or ligands with an immobilized macromolecule. The usefulness of this method was demonstrated in the interactions of sulphamethizole and salicylic acid with human serum albumin (HSA). The mutual inhibitory effect on the binding of one drug of the presence of the other was directly shown to be due to displacement of the bound drug from HSA by the other. On the basis of a double-reciprocal plot analysis, these two drugs are interpreted as competing for the same primary binding sites.


N I Nakano, Y Shimamori, S Yamaguchi. Mutual displacement interactions in the binding of two drugs to human serum albumin by frontal affinity chromatography. Journal of chromatography. 1980 Feb 1;188(2):347-56

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PMID: 7380930

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