Abstract
A sensitive electrochemical enzyme-linked immunosorbent assay (ELISA) for the determination of cucumber mosaic virus (CMV) was proposed in this paper. The activity of labeled enzyme, horseradish peroxidase, was measured with electrochemical methods using o-phenylenediamine as substrate. The enzymatic reaction product is 2,3-diaminophenazine, which can be easily reduced on the dropping mercury electrode with improved sensitivity. Coupled with the plate trapped antigen indirect ELISA format using polyclonal rabbit antibody of CMV, the electrochemical detection was performed for CMV with the detection limit of 0.5 ng ml −1, which is ten times more sensitive than the colorimetric ELISA method. The conditions for enzymatic reaction and immunoassay were carefully optimized.
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