{"id":1058,"date":"2019-02-21T14:01:19","date_gmt":"2019-02-21T20:01:19","guid":{"rendered":"https:\/\/www.vanderbilt.edu\/cit\/?p=1058"},"modified":"2019-04-17T12:42:31","modified_gmt":"2019-04-17T18:42:31","slug":"quantity-identified-metabolites-untargeted-experiments","status":"publish","type":"post","link":"https:\/\/www.vanderbilt.edu\/cit\/quantity-identified-metabolites-untargeted-experiments\/","title":{"rendered":"Quantity of Identified Metabolites in Untargeted Experiments"},"content":{"rendered":"

How Many Metabolites will be Identified in a Global, Untargeted Metabolomics Study?<\/h3>
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This is a difficult question to answer!<\/p>\n

The CIT typically observes between 500 and 10,000 compounds, depending on sample type. It is important to note that there is a range of annotation confidences assigned to each detected compound. The CIT uses a classification system to describe annotation confidence. Briefly, more experimental evidence (e.g.<\/em>, diagnostic fragmentation data, retention time, collision cross section, reference standard, etc.) enables a higher confidence metabolite identification assignment. While some compounds can be unambiguously identified (Level 1), others may be reported in groups (multiple candidate annotations; Level 3) owing to the fact that numerous metabolites are isomeric and metabolite databases are inherently incomplete. We search our extensive in-house library to reduce the number of candidates and\/or increase the confidence of candidates when possible.<\/p>\n

This classification scheme is widely adopted by the metabolomics community, see 10.1007\/s13361-016-1469-y<\/a> for more information.<\/p>\n<\/div><\/section>
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