A chemiluminescent immunoassay for zeranol and its metabolites

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Abstract
A sensitive immunoassay is presented for the detection of the xenobiotic oestrogenic growth promotor zeranol (Ralgro®) and the mycotoxin zearalanone. The detection is based on cheniiluminescence using a zeranol–isoluminol conjugate. A lowest detectable amount of 2–5 pg zeranol per tube was achieved. The bovine zeranol metabolites zearalanone and taleranol can also be determined, and this has been shown in a metabolic pilot study of zeranol in veal calves. This study indicates that taleranol is a major metabolite in male veal calves, in contrast to zearalanone which is known to be the major metabolite in adult cattle.