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非靶向和靶向代谢组学检测物质代谢组的时候选用仪器需要注意些什么呢?做非靶向分析的话可以用靶向分析的仪器吗?
读了篇文献[Targeted and untargeted gas chromatography-mass spectrometry analysis of honey samples for determination of migrants from plastic packages(塑料包装蜂蜜样品中迁移物测定用靶向和非靶向[url=https://insevent.instrument.com.cn/t/Mp][color=#3333ff]气相色谱[/color][/url]-质谱分析)],[url=https://insevent.instrument.com.cn/t/Mp][color=#3333ff]气相色谱[/color][/url]分析采用Agilent 6890 N (Agilent, Waldbronn, Germany)[url=https://insevent.instrument.com.cn/t/Mp][color=#3333ff]气相色谱仪[/color][/url]与配备惰性离子源的Agilent 5973四极质选谱仪进行。【文献原文:2.2. Instrumentation and software:GC analyses were performed on an Agilent 6890 N (Agilent, Waldbronn, Germany) gas chromatograph coupled to an Agilent 5973 quadrupole mass selective spectrometer equipped with an inert ion source.】在非靶向分析那写的:根据文献,包括目标分析物和其他从塑料到食物的潜在迁移物的数据库,已创建(补充数据表S2)。利用NIST和Wiley质谱文库对所研究的蜂蜜样品中的m/z离子特征进行了监测,并对其进行了鉴定。共检出13种疑似化合物。[文献原文: 3.4.2. Untargeted approach :A database including the target analytes and other potential migrants from plastic into food, based on the literature, has been created (Supplementary data Table S2). Based on their characteristic m/z ions, all these compounds were monitored in the studied honey samples using the NIST and Wiley MS libraries for their identification. A total of 13 putative compounds were found.]文献中用的是低分辨质谱吧?低分辨质谱能进行非靶向分析吗?但是低分辨质谱不是需要标品吗?文献就只有靶向分析的标品,非靶向分析只有数据库也行吗?
做非靶向代谢组学,没有想要检测的目标物,目的在于尽可能多的检测出样品中的代谢物,在前处理过程中加入内标物质,在数据分析时,根据内标校正数据。。那如果做靶向代谢组学就是需要购买想要分析的目标物的标准品来做标准品对照液,是不是就是外标法? 除了标准品以外还需要在前处理过程中加入内标吗?