Microbial populations in white rice (Oryza sativa L.) samples stored for 6 months in open or closed conditions were studied and their metabolite profiles analyzed using GC/MS to elucidate the relationship between storage and rice quality. Rice samples stored in open conditions at 25 °C were contaminated by Aspergillus tritici, Cladosporium cladosporioides, and Penicillium sp., whereas the control stored in closed conditions at 5 °C was mainly contaminated by Hyphopichia burtonii and A. tritici. These differences resulted in significantly different metabolite profiles. Increased mold population decreased the levels of fresh rice flavor-associated volatile metabolites and primary energy sources, but increased the levels of metabolites associated with lipid oxidation, polyols, and energy production. Thus, rice quality, especially flavor, could be significantly influenced by the increased mold population caused by open storage at 25 °C; volatile metabolites and polyols are potential indicators of rice quality.

中文翻译：

---

不同贮藏条件对白米（Oryza sativa L.）代谢产物和微生物谱的影响。

研究了在开放或封闭条件下储存6个月的白米样品中的微生物种群，并使用GC / MS分析了它们的代谢产物，从而阐明了储存与稻米质量之间的关系。在25°C的露天条件下储存的水稻样品受到了黑曲霉，克拉多孢菌和青霉菌的污染，而在5°C的封闭条件下储存的对照则主要受到了Burphoiiii和Tritici的污染。这些差异导致代谢物谱显着不同。霉菌数量的增加减少了与新鲜大米风味相关的挥发性代谢物和主要能源的含量，但增加了与脂质氧化，多元醇和能源生产相关的代谢物的含量。因此，米的品质，尤其是风味，可能会受到25°C下露天存放引起的霉菌数量增加的显着影响; 挥发性代谢物和多元醇是大米质量的潜在指标。