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Year : 2001
Tome : 152
Volume : 7
Pages : 555-560
Title : Fungal contamination of rice from south Vietnam, mycotoxinogenesis of selected strains and residues in rice
Authors : TRAN SY TRUNG, J.D. BAILLY, A. QUERIN, P. LE BARS and P. GUERRE
Summary : 25 samples of Vietnamese rice coming from the Mekong delta were analysed for fungal contamination. Ergosterol content measurement and total fungal load determination revealed that moulds contamination was quite weak. Identification of fungal species revealed that Aspergillus genus was the most important (43.75 % of isolates) followed by Fusarium (21.8 %) and Penicillium (10.9 %). This analysis also revealed the presence of toxigenic strains such as Aspergillus flavus, A. ochraceus and Penicillium citrinum. These strains were tested for their toxinogenic potential on either YES liquid medium or on autoclaved rice. 80 % of A. flavus strains were able to produce cyclopiazonic acid (levels up to 32.3 ppm), all strains of A. ochraceus synthesised ochratoxin A (one at 178 ppm) and the tested strain of P. citrinum was moderately toxigenic for citrinin. Moreover two rice samples were found contaminated with high level of ochratoxin A (21.3 and 26.2 ppb). Such contamination can probably be linked to unfavourable post harvest storage and climatic conditions.
Keywords : fungal contamination - rice - toxinogenesis - cyclopiazonic acid - ochratoxin A.
Correspondence : J.D. BAILLY
Adress : jd.bailly@envt.fr
Link : pdf

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