Analysis of ochratoxin a in coffee by solid-phase cleanup and narrow-bore liquid chromatography-fluorescence detector-mass spectrometry

J Agric Food Chem. 2003 Dec 17;51(26):7564-7. doi: 10.1021/jf034856+.

Abstract

A method for the analysis of ochratoxin A (OTA) in green and roasted coffee has been developed. OTA was extracted from coffee with 1% NaHCO(3), and the extract was filtered and purified by solid-phase cleanup using a polymeric column that exhibits reversed-phase and anion-exchange functionalities. OTA was analyzed on a narrow-bore reversed-phase C(18) HPLC column with acetonitrile/water (0.1% formic acid) (40:60) as mobile phase and quantified with a fluorescence detector. The presence of OTA in coffee was confirmed by single-quadruple mass spectrometry using an electrospray ionization source. The method has been validated, obtaining a recovery of 82.5% and a detection limit of 0.1 ng/g. It has been applied to 20 coffee samples from various countries and different manufacturers with no detection of OTA.

MeSH terms

  • Chromatography, High Pressure Liquid*
  • Coffea / chemistry*
  • Coffee / chemistry*
  • Hot Temperature
  • Mycotoxins / analysis*
  • Ochratoxins / analysis*
  • Plant Extracts / chemistry
  • Quality Control
  • Seeds / chemistry*
  • Spectrometry, Mass, Electrospray Ionization

Substances

  • Coffee
  • Mycotoxins
  • Ochratoxins
  • Plant Extracts
  • ochratoxin A