Detection and quantification of Aspergillus ochraceus in green coffee by PCR.

Abstract:

AIMS:The aim of this study was to detect and quantify DNA of the ochratoxinogenic fungus Aspergillus ochraceus in green coffee and to compare the results with the ochratoxin A content of naturally contaminated samples. METHODS AND RESULTS:A DNA extraction protocol based on a combination of ultrasonification and a commercial kit was tested for the recovery of fungal DNA. PCR and real-time PCR protocols were established for the detection of A. ochraceus. Sensitivity of the PCR was checked by the addition of inoculated green coffee and pure fungal DNA to uncontaminated green coffee samples. The A. ochraceus DNA content of 30 naturally contaminated green coffee samples was determined and compared with the ochratoxin A concentrations. CONCLUSIONS:Aspergillus ochraceus can be rapidly and specifically detected in green coffee by PCR. A positive correlation between the ochratoxin A content and the DNA quantity was established. SIGNIFICANCE AND IMPACT OF THE STUDY:This work offers a quick alternative to the conventional mycological detection and quantification of A. ochraceus in green coffee.

journal_name

Lett Appl Microbiol

authors

Schmidt H,Bannier M,Vogel RF,Niessen L

doi

10.1111/j.1472-765X.2004.01524.x

subject

Has Abstract

pub_date

2004-01-01 00:00:00

pages

464-9

issue

6

eissn

0266-8254

issn

1472-765X

pii

LAM1524

journal_volume

38

pub_type

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