This provides more relevance to this study, since there is a guarantee regarding the origin of the samples. This, however, cannot be assured when evaluating samples of commercial wines. A total of 32 wine samples from eight regions of the south and the northeast of Brazil, as specified in Table 3, were evaluated. The location of the seven wine-growing areas in the south of Brazil is shown in Fig. 1; it should be noted that the distance between area 1 and area 7 is more than 1000 km.