Distribution and aflatoxin contamination by Aspergillus flavus in peanut from the southwest China

ZHANG Xing，YUE Xiao-feng*，DING Xiao-xia*，LI Pei-wu*，YU Qiu-yu，XIE Hua-li， ZHANG Qi，ZHANG Zhao-wei，ZHANG Wen

CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2019, Vol. 41 ›› Issue (5) : 773.

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CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2019, Vol. 41 ›› Issue (5) : 773. DOI: 10.19802/j.issn.1007-9084.2018242

Distribution and aflatoxin contamination by Aspergillus flavus in peanut from the southwest China

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Abstract

To investigate the distribution, toxigenicity of Aspergillus flavus and aflatoxin contamination in pea?nut at post-harvest in southwest region in China, a total of 206 A. flavus strains were isolated from 177 peanut and soil samples from Guangnan in Yunnan Province (YNGN), Chayu in Tibet (XZCY), Peng’an in Sichuan Province (SCPA). Among them, 71 post-harvest peanut samples in these regions were evaluated on their aflatoxin levels. Re? sults showed that detection rate (50%) and colony number (212.0 CFU/g) in SCPA samples were both the highest, while those in XZCY (18.1%, 52.8 CFU/g respectively) were the lowest. Among the strains, 88.6% were toxigenic.They mainly produced B group aflatoxins, especially AFB1 which was in 0-8500 μg/L. Their capability order was in
YNGN > XZCY > SCPA. The 11.4% A. flavus strains were atoxigenic, which were all from XZCY. The level of afla? toxin contamination in peanut at post-harvest in southwest region was low, only 5 of 71 (7.0%) samples were posi?tive with AFB1 content of 0-7.2 μg/kg (0-7.2 μg/kg from SCPA samples, 0-2.1 μg/kg from YNGN samples, and ze?ro from XZCY samples. Threfore, aflatoxin contamination of peanut in southwest China might had close relation? ships with the detection rate, colony number of A. flavus. Thus the higher the detection rate and the colony number, the more serious of the aflatoxin contamination in peanuts.

Key words

southwest region / peanut / Aspergillus flavus / distribution / toxigenicity / aflatoxin contamination

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ZHANG Xing，YUE Xiao-feng*，DING Xiao-xia*，LI Pei-wu*，YU Qiu-yu，XIE Hua-li， ZHANG Qi，ZHANG Zhao-wei，ZHANG Wen. Distribution and aflatoxin contamination by Aspergillus flavus in peanut from the southwest China[J]. CHINESE JOURNAL OF OIL CROP SCIENCES, 2019, 41(5): 773 https://doi.org/10.19802/j.issn.1007-9084.2018242

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