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Breath gas monitoring during a glucose challenge by a combined PTR-QMS/GCxGC-TOFMS approach for the verification of potential volatile biomarkers

机译:通过组合PTR-QMS / GCxGC-TOFMS方法监测葡萄糖激发期间的呼吸气体,以验证潜在的挥发性生物标记物

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摘要

Breath gas profiles, which reflect metabolic disorders like diabetes, are the subject of scientific focus. Nevertheless, profiling is still a challenging task that requires complex and standardized methods. This study was carried out to verify breath gas patterns that were obtained in previous proton-transfer reaction-quadrupole mass spectrometry (PTR-QMS) studies and that can be linked to glucose metabolism. An experimental setup using simultaneous PTR-QMS and complementary highly time-resolved needle trap micro extraction (NTME) combined with comprehensive 2D gas chromatography-time-of-flight mass spectrometry (GCxGC-TOFMS) was established for the analysis of highly polar volatile organic compounds (VOCs). The method was applied to the breath gas analysis of three volunteers during a glucose challenge, whereby subjects ingested a glucose solution orally. Challenge responsive PTR-QMS target VOCs could be linked to small n-carbonic (C2-C4) alcohols and short chain fatty acids (SCFA). Specific isomers could be identified by simultaneously applied NTME-GCxGC-TOFMS and further verified by their characteristic time profiles and concentrations. The identified VOCs potentially originate from bacteria that are found in the oral cavity and gastrointestinal tract. In this study breath gas monitoring enabled the identification of potential VOC metabolites that can be linked to glucose metabolism.
机译:反映诸如糖尿病之类的代谢紊乱的呼吸气体特征是科学关注的主题。尽管如此,分析仍然是一项艰巨的任务,需要复杂且标准化的方法。进行这项研究是为了验证以前的质子转移反应-四极杆质谱(PTR-QMS)研究中获得的呼吸气体模式,该模式可能与葡萄糖代谢有关。建立了同时PTR-QMS和互补的高时间分辨针阱微萃取(NTME)结合综合2D气相色谱-飞行时间质谱(GCxGC-TOFMS)的实验装置,用于分析高极性挥发性有机物化合物(VOC)。该方法应用于葡萄糖激发期间三名志愿者的呼吸气体分析,受试者通过口服摄入葡萄糖溶液。挑战响应型PTR-QMS目标VOC可以与少量正碳(C2-C4)醇和短链脂肪酸(SCFA)相关。特定的异构体可以通过同时应用NTME-GCxGC-TOFMS进行鉴定,并通过其特征时间曲线和浓度进一步验证。所确定的VOC可能源自口腔和胃肠道中发现的细菌。在这项研究中,呼吸气体监测能够识别可能与葡萄糖代谢有关的潜在VOC代谢产物。

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