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首页> 外文期刊>Journal of Stored Products Research >Evaluation of critical points of mould growth and mycotoxin production in the stored barley ecosystem with a hazardous initial microbiological state of grain
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Evaluation of critical points of mould growth and mycotoxin production in the stored barley ecosystem with a hazardous initial microbiological state of grain

机译：谷物危险初始微生物状态的储存大麦生态系统中霉菌生长和霉菌毒素产生的关键点评价

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The development of effective control systems for post-harvest preservation and storage processes seems to be one of the best ways to reduce the activity of fungi and thus the risk of mycotoxin contamination of grain during its storage. A crucial step towards developing such a system requires the understanding of ecological relationships between environmental factors, fungal development and mycotoxin production in bulk of grain treated as holistic systems. The aim of this study was to estimate the critical points associated with mould development and mycotoxin production in the ecosystem of malting barley grain with a hazardous initial microbiological state (provided by the inoculation of naturally contaminated grain with Aspergillus ochraceus and Penicillium verrucosum) stored in different temperature and water activity conditions (t = 12-30 degrees C and a(w) = 0.78-0.96, where a(w) corresponds to equilibrium relative air humidity in inter-grain spaces). The most intensive fungal growth occurred in the ecosystems of barley grain with a(w) = 0.91-0.93 stored at 24 and 30 degrees C. The biosynthesis of ochratoxin A (OTA) was observed at 0.91-0.95 a(w) at 18-30 degrees C, whilst penicillic acid and citrinin were detected only at temperatures of 24 and 30 degrees C. The toxicogenic ability of fungi at 12-24 degrees C and a(w)&= 0.80 was significantly limited. In the ecosystem of barley grain, the threshold of fungal concentration (expressed in colony forming units of moulds, CFU g(-1)), for which the amount of OTA exceeded binding limits, was 105 CFU g(-1) of grain. The study indicates that the duration of the lag phase of fungal development (comprising spores germination and the beginning of exponential mould growth), which in all tested ecosystems was shorter than the time, after which admissible levels of OTA were exceeded, may be used to evaluate the safe period, at which grain should be subjected to preservation processes. (C) 2018 Elsevier Ltd. All rights reserved.
机译：收获后保存和储存过程有效控制系统的发展似乎是降低真菌活性的最佳方法之一，从而成为储存期间谷物霉菌污染的风险。发展这种系统的一个关键步骤需要了解作为整体系统的大量谷物中的环境因素，真菌发育和霉菌毒素产生之间的生态关系。本研究的目的是估计与麦芽大麦谷物生态系统中的模具发育和霉菌毒素产生相关的临界点，其具有危险的初始微生物状态（通过与曲霉菌的天然污染的谷物接种而提供不同的温度和水活性条件（T = 12-30℃和（w）= 0.78-0.96，其中（w）对应于谷粒间空间中的相对空气湿度）。大麦粒的生态系统中发生最强烈的真菌生长，其中（w）= 0.91-0.93储存在24和30摄氏度下。在18-0-9-0.95A（W）时观察到Ochratoxin A（OTA）的生物合成。仅在24和30℃的温度下检测到青霉酸和柠檬黄蛋白。在12-24℃和（W）＆amp的温度下的毒性能力。在大麦谷物的生态系统中，真菌浓度的阈值（以菌落形成的模具，CFU G（-1）），ota的量超过结合限制的量为105cfu g（-1）颗粒。该研究表明，在所有测试的生态系统中，真菌发育的滞后阶段的滞后阶段（包括孢子萌发和指数霉菌生长的开始），之后，在超出允许的OTA水平的时间内，可能用于评估安全时期，谷物应进行保存过程。 （c）2018年elestvier有限公司保留所有权利。

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