Quantitative competitive PCR for the detection of genetically modified organisms in food

Quantitative competitive PCR for the detection of genetically modified organisms in food Present polymerase chain reaction (PCR) detection methods only allow the qualitative detection of GMO in food without quantitation of the GMO content. Clearly, the availability of quantitative detection methods for GMO analysis is an important prerequisite for the introduction of threshold limits for GMOs in food. PCR is well known to be quantitative if internal DNA standards are co-amplified together with the target DNA. This quantitative competitive (QC) PCR was first described in the early nineties and is widely used nowadays. We have developed and evaluated QC–PCR systems for the quantitative detection of Roundup Ready TM soybean (RRS) and Maximizer maize (MM) in food samples. Three DNA fragments differing from the GMO specific sequences by DNA insertions were constructed and used as internal standards in QC–PCR. These standards were calibrated by co-amplifying with mixtures containing defined amounts of RRS DNA and MM DNA, respectively. The calibrated QC–PCR systems were applied to several commercial food samples containing RRS and to three certified RRS flour mixtures (Fluka standards). Recently, quantitative methods for the detection of RRS were successfully tested in a collaborative study involving twelve European control laboratories. Thus, QC–PCR methods will allow to survey “de minimis thresholds” of GMOs in food. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Food Control Elsevier

Quantitative competitive PCR for the detection of genetically modified organisms in food

Food Control, Volume 10 (6) – Dec 1, 1999

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Publisher
Elsevier
Copyright
Copyright © 1999 Elsevier Science Ltd
ISSN
0956-7135
eISSN
1873-7129
D.O.I.
10.1016/S0956-7135(99)00074-2
Publisher site
See Article on Publisher Site

Abstract

Present polymerase chain reaction (PCR) detection methods only allow the qualitative detection of GMO in food without quantitation of the GMO content. Clearly, the availability of quantitative detection methods for GMO analysis is an important prerequisite for the introduction of threshold limits for GMOs in food. PCR is well known to be quantitative if internal DNA standards are co-amplified together with the target DNA. This quantitative competitive (QC) PCR was first described in the early nineties and is widely used nowadays. We have developed and evaluated QC–PCR systems for the quantitative detection of Roundup Ready TM soybean (RRS) and Maximizer maize (MM) in food samples. Three DNA fragments differing from the GMO specific sequences by DNA insertions were constructed and used as internal standards in QC–PCR. These standards were calibrated by co-amplifying with mixtures containing defined amounts of RRS DNA and MM DNA, respectively. The calibrated QC–PCR systems were applied to several commercial food samples containing RRS and to three certified RRS flour mixtures (Fluka standards). Recently, quantitative methods for the detection of RRS were successfully tested in a collaborative study involving twelve European control laboratories. Thus, QC–PCR methods will allow to survey “de minimis thresholds” of GMOs in food.

Journal

Food ControlElsevier

Published: Dec 1, 1999

References

  • Polymerase chain reaction (PCR): a possible alternative to immunochemical methods assuring safety and quality of food. Detection of wheat contamination in non-wheat food products
    Allmann, M.; Candrian, U.; Höfelein, C.; Lüthy, J.
  • PCR-based DNA analysis for the identification and characterization of food components
    Meyer, R.; Candrian, U.

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