Enzyme-linked immunosorbent assay for the phytotoxin cleistanthin A.

Enzyme-linked immunosorbent assay is reported for the estimation of cleistanthin A, a major constituent of the toxic plant Cleistanthus collinus. Rabbit antibodies were obtained by immunisation with cleistanthin A hemisuccinate-BSA conjugate and the ELISA developed thereupon could detect cleistanthin A at as low a concentration as 3 ng/ml. Cross-reactivity studies with structural analogs as well as with other phytotoxins and drugs of common occurrence established the suitability of the ELISA to specifically monitor the C. collinus marker molecules in emergency clinical and forensic cases. The simplicity and specificity make the ELISA superior to the other available techniques.