Polyphenol Composition and Antioxidant Activity of Domestic Wines from Shaanxi Province
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Abstract:
The quality and health benefits of domestic wines sold in the cities of Shaanxi province was evaluated, in terms of polyphenol composition and antioxidant activity. We determined the content of total phenol by Folin-Ciocalteu method, total flavonoids by aluminum chloride method, total flavan-3-ols by p-dimethylaminocynnamaldehyde method, total anthocyanins by pH differential method, monomeric phenols by high-performance liquid chromatography, and antioxidant activity by 1-diphenyl-2-picrylhydrazyl method. The results showed that the sampled domestic wines from Shaanxi Province have a high content of polyphenolic compounds and rich monomeric phenols, which correlated with the designated type, origin, and varietal characteristics of the individual samples. However, few samples also contained exogenously added polyphenolic compounds. No adulterated wines or half-juice variants were found among the sampled domestic wines sold in these cities. In addition, high antioxidant activity was detected in the samples, implying health benefits on their consumption. Evaluation of wine quality by wine tasters is limited by the individual competence and personal preference, whereas the current method uses polyphenol composition and antioxidant activity to evaluate wine quality and therefore, is feasible and effective in comparison. The findings of this study could provide a new quality reference for consumers besides that indicated by the price.
