Abstract

An immunoelectrophoretic method is described for analyzing alkali parasporal crystal digests of Bacillus thuringiensis preparations (Dipel TM). There were two distinct immunoprecipitate peaks (A and B) in the direction of the anode. The higher A peak had no correlation with the bioactivity of B. thuringiensis samples, whereas, the height of the B peak was directly proportional to the bioactivity. There was excellent agreement between the immunoassay and the bioassay of insecticidal potency in terms of international units.

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