Volatile profiles and aflatoxin production by toxigenic and non-toxigenic isolates of Aspergillus flavus grown on sterile and non-sterile cracked corn

Anthony J. De Lucca 1, Stephen M. Boue 1, Carol Carter-Wientjes 1, Deepak Bhatnagar 1
1 - Southern Regional Research Center, USDA, New Orleans, USA
Ann Agric Environ Med
2012; 19 (1):
ICID: 988589
Article type: Original article
Aspergillus flavus is a saprophytic fungus which can grow on corn and produce aflatoxins which render it unsafe for consumption as food and feed. In this study, aflatoxin and non-aflatoxin producing isolates of A. flavus were grown separately on wet (20% water added), sterile or non-sterile cracked corn. Wet and dry cracked corn controls were included as needed. Secondary metabolic volatiles were identified and aflatoxin concentrations determined over a 12-day period. Volatiles unique to the toxigenic A. flavus isolates were determined by comparison with volatiles produced by the respective corn controls and the non-toxigenic A. flavus isolate. The number and identity of the volatiles produced by these A. flavus isolates varied by isolate, whether sterile or non-sterile corn was the substrate, and the sampling day. Overall, most of the volatiles were produced before day 8 after inoculation. Aflatoxin production was 10-fold lower on the sterile corn, compared to the non- sterile corn. Volatiles unique to the aflatoxin producing isolates were identified on both substrates after comparison with those produced by the non-aflatoxin producing isolate, as well as the corn control samples. Results indicate that several factors (substrate, fungal isolate, culture age) affect volatile and aflatoxin production by A. flavus.
PMID 22462452 - click here to show this article in PubMed

Recommend this article to:


Related articles in IndexCopernicus™
     Aspergillus flavus [36 related records]
     aflatoxin [28 related records]
     metabolic volatiles [0 related records]
     toxigenic [0 related records]
     atoxigenic [0 related records]
     corn [40 related records]


Related articles

P Chaudhary, P Singh,
K Abd El-Rheem, S Zaghloul,
M Houshyarfard , H Rouhani,
Characterization of Iranian Nonaflatoxigenic Strai...
Out of fifty-two Iranian nonaflatoxigenic strains of Aspergillus flavus, which were collected from various substrates (soil and kernel) and sources (peanut, corn and pistachio), fifteen representatives were selected according to their different geogr...