Specificity of Mouse Monoclonal Anti-Okadaic Acid Antibodies to Okadaic Acid and Its Analogs among Diarrhetic Shellfish Toxins.

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The specificity of five mouse monoclonal antibodies to okadaic acid was studied for use in an enzyme-linked immunosorbent assay of okadaic acid and its analogs. OA8-2 and OA22-22 antibodies (IgG-<2a>-K), which bind more strongly to dinophysistoxin-1 and 7-O-palmitoyl-dinophysistoxin-1 than to okaic acid or 7-O-palmitoyl-okadaic acid in 50% aqueous methanol, were useful in the detection of dinophysistoxins-1 and -3. OA10-8 (IgG1-K), which binds more strongly to 7-O-palmitoyl-okadaic acid and 7-O-palmitoyl-dinophysistoxin-1 than to okadaic or dinophysistoxin-1 in 50% aqueous methanol, was useful in the detection of dinophysistoxin-3. OA423-3 (IgG1-K), which binds weakly to dinophysistoxin-1 and 7-O-palmitoyl-dinophysistoxin-1 in 20% aqueous methanol, was useful in the selective detection of okadaic acid. OA958-2(IgG1-K), which binds with equal strength to each of the four toxins in methanol, was useful in the detection of all okadaic acid analogs, and the minimum detectable concentration was 30ng/ml. OA423-3 and OA958-2 retained their binding ability in 50% acetone, ethyl ether, or benzene in methanol.

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