ISSN: 2577-4328
Natural Co-Occurrence of Aflatoxins, Cyclopiazonic Acid, and their Production by Aspergillus Flavus Isolates from Corn Grown in Egypt
Mycotoxins are metabolites of fungi that can adversely affect animal and human health. Mycotoxins can be produced incorn during storage or processing, but are most frequently associated with fungal infection that occur before harvest.Sixty corn samples were purchased from retail markets from Cairo and Giza Governorates in summer and winter seasonsfrom Egypt. The samples were examined for dominants fungi and mycotoxins Aflatoxins (AFS) and cyclopiazonic acid(CPA) and their Aspergillus flavus production. AFS and CPA were determined by high performance liquid chromatography(HPLC). The results indicated that, the dominants fungi genra were Aspergillus, Fusarium, Penicillium and Alternaria inall corn samples in summer and winter seasons. From 239 of Aspergillus genus isolates 63.7% was identified as A. flavus,they were tested for AFS and CPA production. The results were showed that only 96 out from 151 A. flavus isolates(63.6%) were positive to AFS and CPA toxins production. The results indicated that 64.6 % from A. flavus isolates wereproduced both of AFS and CPA. The averages of AFS and CPA production were 9.4 and 12.56 mg /L in YES mediumrespectively. For natural co-occurrence of AFS and CPA in corn samples, the results indicated that 9 samples out from 30(30.0%) and 7/30 (23.3%) from corn grain samples collected from Cairo Governorate in winter season werecontaminated with both of AFS (B1, B2 ,G1 and G2 ) and CPA , respectively. On the other hand, in summer season 11samples out from 30 (36.3%) and 8/30 (26.6%) were contaminated with both of AFS (B1, B2 ,G1 and G2 ) and CPA,respectively. The results also indicated that 7 out from 30 (23.3%) and 6/30(20 %) of corn samples collected from GizaGovernorate were contaminated with AFs and CPA respectively in winter season. While, 10 samples out from 30 (33.3 %)and 10/30 (33.3 %) samples were contaminated with AFS and CPA in Giza Governorate in summer season respectively.These represent 23.3% and 33.3 % AFS positive samples for corn grain samples collected from Giza Governorate in bothseason. The concentration of both AFS (B1, B2, G1 and G2) and CPA were ranged from (0.93 -45.5, 0.10- 19.0, 0.20-23.0 and0.22-18.0) and 1.2-56.0μg/kg in the corn samples were collected from Cairo and Giza Governorates in summer andwinter seasons respectively. Our study try to resolve this problem by modification a novel incubating the CPA spotsdetection with indirect apparel color reagent which giving stable spots color on TLC an obvious detection and an accuratequantitative determination by using the densitometric procedure .This is the first report of natural co-occurrence of AFsand CPA and there fungi production in Egypt.
Keywords:
Aflatoxins; Cyclopiazonic Acid; Fungi; Aspergillus Flavus; HPLC; TLC
