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Keywords:

  • NMR;
  • 1H[BOND]13C 2D;
  • green coffee bean;
  • complex mixture analysis;
  • chlorogenic acids

Abstract

A complex mixture analysis by one- and two-dimensional nuclear magnetic resonance (NMR) spectroscopy was carried out for the first time for the identification and quantification of organic compounds in green coffee bean extract (GCBE). A combination of 1H[BOND]1H DQF-COSY, 1H[BOND]13C HSQC, and 1H[BOND]13C CT-HMBC two-dimensional sequences was used, and 16 compounds were identified. In particular, three isomers of caffeoylquinic acid were identified in the complex mixture without any separation. In addition, GCBE components were quantified by the integration of carbon signals by use of a relaxation reagent and an inverse-gated decoupling method without a nuclear Overhauser effect. This NMR methodology provides detailed information about the kinds and amounts of GCBE components, and in our study, the chemical makeup of GCBE was clarified by the NMR results. Copyright © 2010 John Wiley & Sons, Ltd.