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Abstract
The effect of various soft acid cation acetate salts on the retention of the peptides Phe-(Gly)n, where n=1–4, and on phenylalanine, indicates a correlation between the softness character of the cation of the acetate salt used in the mobile phase and retention in reversed-phase high performance liquid chromatography. Inorganic soft acid cation salts did not exhibit the same increased retention properties. By using silver(I) valerate or silver(I) octanoate as ion-pairing reagents in the mobile phase for RP-HPLC, static retention of peptides was achieved.