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首页> 外文期刊>Journal of Agricultural and Food Chemistry >Ultraviolet Light Stimulates Flavonol Accumulation in Peeled Onions and Controls Microorganisms on Their Surface
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Ultraviolet Light Stimulates Flavonol Accumulation in Peeled Onions and Controls Microorganisms on Their Surface

机译:紫外线会刺激去皮洋葱中的黄酮醇积累,并控制其表面上的微生物。

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The effects of ultraviolet (UV) light on flavonol content in peeled onions (Allium cepa L.) and on microbial survival on their surface were investigated. The content of phenolic compounds showed a gradient within the onion bulb, with the highest level in the external dry "skin" (tunic) and the lowest level in the center. Peeled bulbs were treated with UV light comprising the bands of UV-C (more than half of the total UV output), UV-A, and UV-B. The response to UV depended upon the position of the scales within the bulb. In the outer fleshy scales, the UV doses of 1.2-6 kj m~(-2) approximately doubled the accumulation of flavonols and the total antioxidant capacity. When mid-depth (5th from the outside) scales were exposed to UV, the lowest dose tested (1.2 kj m~(-2)) had no significant effect on flavonols accumulation, whereas the higher doses decreased their levels. The low-dose UV treatment reduced the count of Escherichia coli on artificially contaminated peeled onions by 1.5-3 logs and alleviated the decay of Penicillium-inoculated bulbs. The present study has demonstrated a potential of UV light for simultaneous decontamination of peeled onions and their enrichment in health-enhancing phytonutrients.
机译:研究了紫外线(UV)对去皮洋葱(Allium cepa L.)中黄酮醇含量及其表面微生物存活率的影响。洋葱鳞茎中酚类化合物的含量呈梯度变化,外部干燥的“皮肤”(外衣)中含量最高,而中部含量最低。剥皮的灯泡用包含UV-C(超过总UV输出量的一半),UV-A和UV-B波段的UV光处理。对紫外线的响应取决于鳞片在灯泡内的位置。在外部肉质鳞片中,紫外线剂量为1.2-6 kj m〜(-2)时,黄酮醇的积累量和总抗氧化能力大约增加了一倍。当中深度(外部第5个)水垢暴露在紫外线下时,测试的最低剂量(1.2 kj m〜(-2))对黄酮醇的积累没有显着影响,而较高的剂量则降低其含量。低剂量紫外线处理使人工污染的去皮洋葱上的大肠杆菌数量减少了1.5-3个原木,并减轻了接种青霉的鳞茎的腐烂。本研究表明,紫外线可以同时对去皮的洋葱进行净化,并富集健康的植物营养素。

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