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Application of PCR-DGGE in determining food origin : cases studies of fish and fruits

Montet D., Le Nguyen D.D., El Sheikha A., Condur A., Metayer I., Loiseau G.. 2008. In : Eds by Richard Glass, Wayne Martindale. Greening the food chain, 3 and 4. Includes papers from the workshops : 3. Traceability: Tracking and tracing in the food chain 4. Supplying sustainable and innovative food and drink solutions. Wellesbourne : AAB, p. 11-22. (Aspects of applied biology, 87). Workshop on Traceability : Tacking and Tracing in the Food Chain. 3, 2008-11-15, York (Royaume-Uni).

The determination of geographical origin is a demand of the traceability system of import-export food products. For this purpose, molecular techniques employing 16S, 26S rDNA profiles generated by PCR-DGGE (polymerase chain reaction - denaturing gradient gel electrophoresis) were used to detect the variation in microbial community (bacteria, yeast) structures of Pangasius fish from Viet Nam harvested in different aquaculture farms and during different seasons and two fruits Physalis from Egypt and mandarins from Spain and Morocco. In Physalis case, ecology of yeasts was also studied for the same purpose. Bacterial band profiles of fish and mandarins, and yeast band profiles of Physalis were specific for each location and could be used as a bar code to certify the origin of fish and fruits. This method is a new traceability tool which provides food with a unique biological bar code and makes it possible to trace back the food to their original location.

Mots-clés : pangasius hypophthalmus; mandarine; physalis ixocarpa; provenance; pcr; Électrophorèse; analyse qualitative; flore microbienne; languedoc-roussillon; Égypte; viet nam; france

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