Abstract

Erythromycin forms association complexes with four sulfonic acid dyes that can be extracted into chloroform and quantified by spectrophotometry. Of the dyes studied, MO and O IV form 1:1 complexes with the conjugate acid of erythromycin. Solutions containing 20 to 100 μg/ml of erythromycin can be conveniently analyzed by use of MO and the method described.

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