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Interactions of cephalosporins and penicillins with nonpolar octadecylsilyl stationary phase

✍ Scribed by Francisco Salto; Julio G. Prieto; Mary Teresa Alemany

Publisher: John Wiley and Sons
Year: 1980
Tongue: English
Weight: 560 KB
Volume: 69
Category: Article
ISSN: 0022-3549
DOI: 10.1002/jps.2600690506

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✦ Synopsis

The capacity factors of several penicillins and cephalosporins, as well as those of 7-aminocephalosporanic acid, 6-aminopenicillanic acid, and 7-aminodeacetoxycephalosporanic acid, were determined at pH 2.5-7.5 with different methanol concentrations in the mobile phase. The influence of ionic strength on activity factors also was studied. Some theoretical equations providing a quantitative description of the influence of the mobile phase pH on the retention of penicillins and cephalosporins by an octadecylsilyl stationary phase were established. The analysis of experimental data by a nonlinear least-squares fit to theoretically deduced equations permitted determination of the capacity factors of anionic, cationic, zwitterion, and undissociated forms of the substances studied.

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