Liquid Chromatographic Determination of Cyclopiazonic Acid in Corn and Peanuts

Abstract

Abstract A liquid chromatographic (LC) method Is described for the determination of cyclopiazonic acid (CPA) in corn and peanuts. CPA was extracted from the test portion with methanol-2% NaHC03 solution (7 + 3); the extract was defatted with hexane and then acidified. CPA was partitioned into chloroform and applied to a Sep-Pak silica cartridge. CPA was eluted with chloroform-methanol (3 + 1), the solvent was evaporated, and the residue was dissolved In methanol- water (60 + 40). CPA was quantitated by reversed- phase LC with a linear gradient of 0-4mM ZnS04 In methanol-water (85 + 15) and UV measurement at 279 nm. Recoveries of CPA from corn spiked over the range of 50-500 ng/g and peanuts spiked over the range of 100-500 ng/g were 72-84% and 74-80%, respectively. The limits of quantitation for CPA in corn and peanuts were about 50 and 100 ng/g, respectively. CPA (820 ng/g) was found In corn naturally contaminated with anatoxin Bi, and CPA Identity was confirmed by tandem mass spectrometry.