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首页> 外文期刊>Journal of mass spectrometry: JMS >Thermal degradation of -carotene studied by ion mobility atmospheric solid analysis probe mass spectrometry: full product pattern and selective ionization enhancement
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Thermal degradation of -carotene studied by ion mobility atmospheric solid analysis probe mass spectrometry: full product pattern and selective ionization enhancement

机译：离子迁移率大气固体分析探针质谱法研究-胡萝卜素的热降解：全产物模式和选择性电离增强

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摘要

Atmospheric solid analysis probe mass spectrometry has the capability of capturing full product patterns simultaneously including both volatile and semi-volatile compounds produced at elevated temperatures. Real-time low-energy collision-induced fragmentation combined with ion mobility separations enables rapid identification of the chemical structures of products. We present here for the first time the recognition of full product patterns resulting from the thermal degradation of -carotene at temperatures up to 600 degrees C. Solvent vapor-induced ionization enhancement is observed, which reveals parallel thermal dissociation processes that lead to even- and odd-numbered mass products. The drift-time distributions of high mass products, along with -carotene, were monitored with temperature, showing multiple conformations that are associated with the presence of two -rings. Products of masses 346/347, however, show a single conformation distribution, which indicates the separation of two -rings resulting from the direct bond scission at the polyene hydrocarbon chain. The thermal degradation pathways are evaluated and discussed. Published 2016. This article is a U.S. Government work and is in the public domain in the USA.
机译：大气固体分析探针质谱仪能够同时捕获完整的产品模式，包括在高温下产生的挥发性和半挥发性化合物。实时低能碰撞诱导的碎片结合离子迁移率分离可快速鉴定产品的化学结构。我们在此首次提出由-胡萝卜素在高达600摄氏度的温度下热降解而产生的完整产物模式的认识。观察到了溶剂蒸气诱导的电离增强，这揭示了导致均一和偶合的平行热解离过程。奇数质量产品。用温度监测了高质量产品以及-胡萝卜素的漂移时间分布，显示出与两个-环的存在相关的多种构象。然而，质量346/347的产物显示出单一的构型分布，这表明由于在多烯烃链上的直接键断裂而导致的两个环的分离。对热降解途径进行了评估和讨论。 2016年发布。本文是美国政府的工作，在美国属于公共领域。

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