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Headspace volatiles from eight strains ofAspergillus flavus (four aflatoxigenic strains and four nonaflatoxigenic strains), grown for 1, 2, 3, 4, 8, and 10 days in submerged cultures, were collected in Tenax GC traps. The traps were desorbed onto a 50-m gas-liquid chromatography capillary column by heat and gas purge from an external direct injector device. The column was interfaced with a mass spectrometer data acquisition system. Peaks were identified by comparing retention times and mass spectra with those obtained from authentic compounds and by using a computer-assisted mass spectral data base. Aflatoxigenic strains ofA. flavus produced several C15 H24 compounds (e.g., alpha-gurjunene,trans -caryophyllene, and cadinene) which peaked in 3-day cultures and were not present in earlier (1- and 2-day) or later (8- and 10-day) cultures. None of these volatiles were detected in nonaflatoxigenic strains ofA. flavus . There was an apparent correlation between the release of C15 H24 volatile compounds and the initiation of aflatoxin biosynthesis, and a correlation between decline of aflatoxin synthesis and the disappearance of the C15 H24 compounds unique to aflatoxigenicA. flavus also existed.

C 15 H 24 Volatile Compounds Unique to Aflatoxigenic Strains of Aspergillus flavus

C ₁₅ H ₂₄ Volatile Compounds Unique to Aflatoxigenic Strains of Aspergillus flavus