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Chemical derivatization as a tool for optimizing MS response in sensitive LC–MS/MS bioanalysis and its role in pharmacokinetic studies. Bioanalysis 2012; 4:213-20. [DOI: 10.4155/bio.11.306] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Chemical derivatization is the only technique that directly affects the physicochemical property of an analyte in an LC–MS/MS assay platform. On the other side, current MS instruments are extremely sensitive, but still their absolute sensitivity is analyte-dependent. In this review, first, difficulty in analyzing neutral compounds and introducing acidity/basicity and/or proton affinity will be described. Second, the sweet spot of the conventional MS ion source across clogP values is presented. Third, optimization of hydrophilicity/hydrophobicity by derivatization is described. Lastly, development of a new derivatizing reagent specifically designed for LC–MS/MS is described and its significance in pharmacokinetic analysis is discussed.
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