A number of non-chemical products are increasing because customers are more aware
of the sources and production processes of the products. One such product is rice, which is the
main food source of Thai people. It can be seen that a variety of rice products are from nonchemical
processes i.e. without chemical fertilizers and pesticides. However, these products
could have naturally occurring toxins produced by fungi. Thus, the contamination of toxins
naturally produced was investigated the fungi to ensure the trust of consumers that the products
are safe to eat. Thirty-one rice products were randomly collected from retail stores in Muang
District, Khon Kaen, Thailand and isolated fungi for molecular identification. The fungi found
among the products were Aspergillus syndowii, A. amstelodamii, A. tamari, A. niger, A.
aculeatus, A. flavus, A. fumigatus, Fusarium equiseti, Rhizopus oryzae, R. microspores,
Trichoderma asperellum, Dendryphiella sp. and Phoma multirostrata. The toxins related to the
fungi were quantified using a highly accurate method, High Performance Liquid
Chromatography with Fluorescence Detector (HPLC/FLD) in comparison with toxin standards
(aflatoxin B1, aflatoxin B2, aflatoxin G1, aflatoxin G2, ochratoxin A, and zearalenone). The
result suggested that among 31 samples with undetectable amounts, only one rice sample was
contaminated with aflatoxin B1 (<1.5 ug/kg), total aflatoxin (0.66 ug/kg) and zearalenone (0.7
ug/kg).
Keywords
mycotoxins; organic; brown rice; food safety; local products
INTERNATIONAL JOURNAL OF AGRICULTURAL TECHNOLOGY
Published by : Association of Agricultural Technology in Southeast Asia (AATSEA) Contributions welcome at : http://www.ijat-aatsea.com
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