Development of a solid-phase cleanup and portable rapid flow-through enzyme immunoassay for the detection of ochratoxin A in roasted coffee

Liberty Sibanda, Sarah De Saeger, Ildiko Barna-Vetro, Carlos Van Peteghem

Research output: Article

46 Citations (Scopus)

Abstract

A membrane-based flow-through enzyme immunoassay (patent application pending) for the detection of ochratoxin A (OA) in roasted coffee was developed. First, an extraction and solid-phase cleanup method was developed. A high partition coefficient for OA in the mobile phase was achieved by using methanol/5% aqueous NaHCO3 as the sample extraction and cleanup solvent. The solid-phase (aminopropyl) cleanup was developed to chromatographically elute OA but retain cross-reacting compounds. Without using aminopropyl cleanup, cross-reacting compounds resulted in 100% false positives for both flow-through enzyme immunoassay and HPLC methods. However, after cleanup with aminopropyl, no false positives were observed. The flow-through results were visually evaluated. The sensitivity achieved for the flow-through was 4 μg kg-1 in spiked roasted coffee. The assay was used to screen roasted coffee samples. Results were confirmed with HPLC with a detection limit of 1 μg kg-1.

Original languageEnglish
Pages (from-to)6964-6967
Number of pages4
JournalJournal of Agricultural and Food Chemistry
Volume50
Issue number24
DOIs
Publication statusPublished - nov. 20 2002

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ASJC Scopus subject areas

  • Chemistry(all)
  • Agricultural and Biological Sciences(all)

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