Grape cultivar differentiation

E. Revilla, E. Garcia-Beneytez, F. Cabello, G. Martin-Ortega and J.-M. Ryan, Value of high-performance liquid chromatographic analysis of anthocyanins in the differentiation of red grape cultivars and red wines made from them. J. Chromatogr.A 915 (2001) 53-60. 

The monoterpene pattern can be used to differentiate cultivars. For example, a clear distinction can be made between wines from the grape cultivar White Riesling and wines from other grape cultivars which are also sold as Riesling . As shown in Fig. 20.7, the monoter-pene concentrations (especially of linalool, hotrienol, a-terpineol, and 3,7-dimethylocta-l,5-fraws-dien-3,7-diol) in White Riesling are considerably higher than in the other Riesling wines. 

Individual anthocyanin composition is distinctive for any given plant, so anthocyanin analysis is very useful in distinguishing between species. Chemotaxonomic differentiation is commonly based on qualitative differences (163), furthermore within one cultivar (e.g., grapes) even varieties can be discriminated by quantitative differences (164). The anthocyanic profiles of 11 different grape varieties obtained with RP-HPLC are shown in Fig. 15 (165). The characteristic differences in anthocyanin patterns have also been successfully applied to the detection of adulterations in products of cranberries (166), black currants (166), blackberries (167), and grapes (168). 

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