Comparative study on the use of anthocyanin profile, color image analysis and near-infrared hyperspectral imaging as tools to discriminate between four autochthonous red grape cultivars from la Rioja (Spain)

摘要

Three independent methodologies were investigated to achieve the differentiation of red grapes fromdifferent grape varieties (Garnacha, Graciano, Mazuelo and Tempranillo) collected from five vineyardslocated in the D.O.Ca. Rioja. Anthocyanin chromatographic analysis, color image analysis and nearinfrared hyperspectral imaging were carried out for the grapes. Then, a Stepwise Linear DiscriminantAnalysis (SLDA) was developed for each data set in order to discriminate grapes according to their grapevariety. As a result, using anthocyanin profile, color image analysis and near infrared hyperspectralimaging respectively, 88%, 54% and 100% of the samples were correctly classified in the internalvalidation process and 86%, 52% and 86% were correctly classified in the leave-one-out cross-validationprocess