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首页> 外文期刊>Journal of mass spectrometry: JMS >Characterization of volatile metabolites formed by molds on barley by mass and ion mobility spectrometry
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Characterization of volatile metabolites formed by molds on barley by mass and ion mobility spectrometry

机译：大麦和离子迁移光谱法通过模具形成挥发性代谢物的表征

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The contamination of barley by molds on the field or in storage leads to the spoilage of grain and the production of mycotoxins, which causes major economic losses in malting facilities and breweries. Therefore, on-site detection of hidden fungus contaminations in grain storages based on the detection of volatile marker compounds is of high interest. In this work, the volatile metabolites of 10 different fungus species are identified by gas chromatography (GC) combined with two complementary mass spectrometric methods, namely, electron impact (EI) and chemical ionization at atmospheric pressure (APCI)-mass spectrometry (MS). The APCI source utilizes soft X-radiation, which enables the selective protonation of the volatile metabolites largely without side reactions. Nearly 80 volatile or semivolatile compounds from different substance classes, namely, alcohols, aldehydes, ketones, carboxylic acids, esters, substituted aromatic compounds, alkenes, terpenes, oxidized terpenes, sesquiterpenes, and oxidized sesquiterpenes, could be identified. The profiles of volatile and semivolatile metabolites of the different fungus species are characteristic of them and allow their safe differentiation. The application of the same GC parameters and APCI source allows a simple method transfer from MS to ion mobility spectrometry (IMS), which permits on-site analyses of grain stores. Characterization of IMS yields limits of detection very similar to those of APCI-MS. Accordingly, more than 90% of the volatile metabolites found by APCI-MS were also detected in IMS. In addition to different fungus genera, different species of one fungus genus could also be differentiated by GC-IMS.
机译：通过铸造或储存的模具污染大麦，导致谷物的腐败和霉菌毒素的产生，这导致麦芽设施和啤酒厂的主要经济损失。因此，基于挥发性标志物化合物的检测，现场检测晶粒储存中的隐藏真菌污染物具有高兴趣。在这项工作中，10种不同的真菌物种的挥发性代谢物通过气相色谱（GC）鉴定与两种互补质谱法，即电子撞击（EI）和大气压（APCI）的化学电离（MS） 。 APCI源利用软X辐射，这使得挥发性代谢物的选择性质子化在没有副反应的情况下。可以鉴定近80种来自不同物质类别的挥发性或半挥发性化合物，即醇，醛，酮，羧酸，酯，取代的芳族化合物，烯烃，萜烯，氧化的萜烯，倍二萜萜烯和氧化均质萜烯。不同真菌物种的挥发性和半抗性代谢物的谱是它们的特征，并允许其安全分化。相同GC参数和APCI源的应用允许从MS转移到离子移动光谱（IMS）的简单方法，这允许现场分析谷物商店。 IMS的表征产生了与APCI-MS的检测的限制。因此，在IMS中也检测到APCI-MS发现的超过90％的挥发性代谢物。除了不同的真菌属之外，不同物种的一个真菌属也可以通过GC-IMS来分化。

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