Multiple-reaction monitoring metabolite identification

The LC-MS/MS technique has been used to quantify and identify phenolic compounds. In order to quantify, multiple reaction monitoring (MRM), in which there is a combination of the precursor ion and one of its daughter fragments, is used to characterize a particular compound. This behavior should be as specific as possible in samples with a complex mixture of phenolic compounds. This technique has been largely used to quantify phenolic compound metabolites in urine and plasma (Urpf-Sarda and others 2005, 2007). In this context, LC-ESI-MS/MS with negative mode has been applied for the identification of a variety of phenolic compounds in a cocoa sample (Sanchez-Rabaneda and others 2003 Andres-Lacucva and others 2000). 

Traditionally, quantitative analysis of drugs and their metabolites both in vivo and in vitro is mainly dependent on multiple reaction monitoring (MRM) with triple quadruple instruments. In contrast, drug metabolite detection and identification often involve various types of mass spectrometers (Ma and Chowdhury, 2007 Prakash et al., 2007). Full-scan MS experiments followed by data-dependent tandem MS/MS acquisition with ion trap or linear ion trap mass spectrometers are carried out to identify common metabolites whose... 

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