Abstract
Rice (Oryza sativa) production ranks fifth in Uruguay’s agricultural exports. Inadequate temperature and humidity conditions increase grain respiration and favor the action of insects and fungi. This process contributes to mass grain losses and stored rice biodeterioration. The objective of this work was to evaluate paddy rice sanitary conditions during storage in commercial silos through two years. The study was carried out using the “El Paso 144” long grain variety for 8,5 and 7 months in 2017 and 2018, respectively. Main biodeterioration agents were detected and identifed. Germination capacity, microbial population and toxin content in rice extracted from the upper and lower areas of the silo were determined at differentstorage times. The microbial population decreased after storage time and in both silos sampling positions. Two mycotoxigenic genera, Fusarium sp and Aspergillus sp. were detected. Mycotoxins, Zearalenone and Ocratoxin-A were not detected, while Deoxinivalenol reached a maximum level of 120 ppb (2017). Aflatoxins B1, B2, G1 and G2 were not detected. The coleopteran Sitophilus sp and Rhizopertha sp. were identifed and quantifed with a maximum incidence of 0,1%. These results demonstrate that storage conditions did not affect grain safety.
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