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An enzyme-linked immunosorbent assay was developed for the detection of macrolide antibiotics by using a polyclonal antibody generated in rabbits immunized with 23-amino-O-mycaminosyltylonolide (23-amino-OMT) covalently linked to keyhole limpet hemocyanin. The specificity and sensitivity of this antibody were characterized by using 23-amino-OMT coupled to alkaline phosphatase as an enzyme-linked label in a direct competitive enzyme-linked immunosorbent assay. The assay sensitivity was as low as 0.3 ng/ml for 23-amino-OMT, with a 50% inhibitory concentration of 8 ng/ml. This antibody exhibited good reactivity with 12-, 14- or 16-membered macrolides possessing amino-substituted sugar moieties, regardless of the presence of neutral sugar residues. Little or no cross-reactivity was observed with the macrocyclic lactone ring structure (tylactone) or macrolides containing only neutral sugars. No cross-reaction was observed with polyenes or nonmacrolide antibiotics. Known macrolide-producing cultures grown in fermentation broth also showed good reactivity, indicating that this assay is useful in detecting this class of metabolites in fermentation.

Enzyme immunoassay for macrolide antibiotics: characterization of an antibody to 23-amino-O-mycaminosyltylonolide