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Chemical derivatization and mass spectral libraries in metabolic profiling by GC/MS and LC/MS/MS
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Chemical derivatization and mass spectral libraries in metabolic profiling by GC/MS and LC/MS/MS
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Journal Article
Chemical derivatization and mass spectral libraries in metabolic profiling by GC/MS and LC/MS/MS
2005
Overview
An overview is presented of gas chromatography/mass spectrometry (GC/MS) and liquid chromatography/mass spectrometry (LC/MS), the two major hyphenated techniques employed in metabolic profiling that complement direct 'fingerprinting' methods such as atmospheric pressure ionization (API) quadrupole time-of-flight MS, API Fourier transform MS, and NMR. In GC/MS, the analytes are normally derivatized prior to analysis in order to reduce their polarity and facilitate chromatographic separation. The electron ionization mass spectra obtained are reproducible and suitable for library matching, mass spectral collections being readily available. In LC/MS, derivatization and library matching are at an early stage of development and mini-reviews are provided. Chemical derivatization can dramatically increase the sensitivity and specificity of LC/MS methods for less polar compounds and provides additional structural information. The potential of derivatization for metabolic profiling in LC/MS is demonstrated by the enhanced analysis of plant extracts, including the potential to measure volatile acids such as formic acid, difficult to achieve by GC/MS. The important role of mass spectral library creation and usage in these techniques is discussed and illustrated by examples.
Publisher
Oxford University Press,Oxford Publishing Limited (England)
Subject
/ Biological and medical sciences
/ chemical constituents of plants
/ Chromatography, Liquid - methods
/ Fourier transform infrared spectroscopy
/ Fundamental and applied biological sciences. Psychology
/ Gas Chromatography-Mass Spectrometry
/ Gas Chromatography-Mass Spectrometry - methods
/ gas-liquid chromatography-mass spectrometry
/ ion trap
/ liquid chromatography-mass spectrometry
/ Liquids
/ methods
/ nuclear magnetic resonance spectroscopy
/ Plant physiology and development
/ Plants
