Abstract
Varietal wines are defined as made primarily from a single variety of grape, which is identified on the label. However the inclusion of other varieties in their production is permitted under defined percentages. The fact that different grape varieties/varietal wines present far different economical values can attract fraudulent practices. Thus the development of methods, which allow the quantification of those varieties, is of crucial importance. The first approach to the method for the relative quantification of must containing two varieties based on microsatellite DNA analysis is presented. Quantification was achieved by densitometry measurements of the amplification products of the pooled varieties, obtained with loci VVMD6 and VVMD7, after their separation and staining on polyacrilamide gels. We have found that a good correlation between the proportion of each variety in must and the signal intensity of the alleles are dependent on the variety (varietal effect) and the microsatellite locus used. The relative quantification of musts can be accomplished by the presented method depending on the presence of overlapping alleles, and the composition of the varieties and their relative amounts.
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Acknowledgments
M. A. Faria gratefully acknowledges the Fundação para a Ciência e a Tecnologia, FCT, “Ciência e Inovação 2010”, for the attribution of grant BPD/20725/2004
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Faria, M.A., Nunes, E. & Oliveira, M.B.P.P. Relative quantification of Vitis vinifera L. varieties in musts by microsatellite DNA analysis. Eur Food Res Technol 227, 845–850 (2008). https://doi.org/10.1007/s00217-007-0795-5
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DOI: https://doi.org/10.1007/s00217-007-0795-5