engleski

Hydroxycinnamates, total phenols and glutathione in Istrian Malvasia wines

Hydroxycinnamates (HCA), total phenols, glutathione and color properties were determined in Istrian Malvasia (Vitis vinifera L.) wines. Wines of vintages 2006-2013 (n=66) were sampled in 2014 across Slovenian and Croatian Istria. The average HCA content in examined wines was 102.8 mg/L (as trans-caftaric acid) whereas the average total phenols content was 159 mg/L (as (+)-catechin). Trans-caftaric acid was the most abundant HCA in all wines, following by its free form: caffeic acid and its glutathione derivative: glutathionyl caftaric acid. Content of glutathione in Istrian Malvasia wines was low (on the average 6.6, 2.2 and 1.3 mg/L in vintages 2011, 2012 and in 2013, respectively) whereas glutathione was not detected in older wines. In older wines the color shifted towards brown.

Istrian Malvasia; hydoxycinnamates; total phenols; glutathione; color

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