Characterization of Goethe white wines: influence of different storage conditions on the wine evolution during bottle aging.

摘要

The aim of this study was to characterize Goethe white wines, produced in the region around Urussanga, Santa Catarina State, Brazil, in terms of their organic acids and polyphenols content, browning index, and in vitro antioxidant activity and to evaluate the evolution of these wines during bottle storage under two distinct conditions. The wines were analyzed utilizing spectrophotometry and liquid chromatography. In relation to the phenolic compounds investigated, trans-caftaric acid was the major component in all samples, ranging from 42.63 to 52.31 mg L-1, followed by catechin (18.90 to 28.09 mg L-1) and epicatechin (2.68 to 4.35 mg L-1). Samples with higher levels of total polyphenols also had higher antioxidant activity. The antioxidant activity, total polyphenols content, and browning index increased with storage. Quercetin showed the strongest correlation (R = 0.84) with antioxidant activity before and after bottle aging. Samples kept at room temperature with light exposure presented greater degradation of phenolic compounds and lower browning index values than the samples stored under controlled conditions. Principal components analysis (PCA) separated the samples according to storage conditions and wine samples. The results clearly verified that the factors light, temperature, and bottle position affected significantly the chemical composition of white wines. copyright Springer-Verlag Berlin Heidelberg 2013.