干热地区葡萄成熟度对霞多丽葡萄酒中酚类物质及抗氧化活性的影响

Polyphenol Profiles and Antioxidant Activity of Chardonnay Wine at Different Grape Ripeness in Hot Regions

针对新疆和硕地区酿酒葡萄的成熟特点,探讨采收期对霞多丽葡萄酒中酚类物质及其抗氧化活性的影响。葡萄可溶性固形物达到20°Brix后每3 d取样1次,监测其糖酸变化。采用小容器酿造法酿制干白葡萄酒,测定其酚类物质含量及抗氧化活性。结果表明:随着采收期的延迟,葡萄总酸含量不断下降,还原糖含量、糖酸比及可溶性固形物不断上升;不同采收期葡萄酒酚类物质含量有差异,不同抗氧化活性指标表示葡萄酒抗氧化效果不同;葡萄酒中各酚类物质含量及其抗氧化能力与葡萄糖酸比相关性显著,与葡萄可溶性固形物相关性极显著。葡萄成熟度对葡萄酒中酚类物质有较大影响。通过测定葡萄的可溶性固形物含量,可快速确定霞多丽葡萄的最佳采收期,有利于提高葡萄酒质量。

Aim at mature characteristic of wine grape in Xinjiang Heshuo region, discuss the influence of grape ripeness on the Chardonnay wine polyphenol and antioxidant activity. Sampling every three days after grape soluble solids at 20 ~Brix, monitoring their sugar and acid change; adopting small container brewing method brew dry white wine and measured their content of polyphenol and antioxidant activity. The result show that the delay of the harvest period, the total acid content of grapes is declining, reducing sugar content, sugar-acid ratio and soluble solids are rising; different harvest period have different wine phenols content, different antioxidant activity indicators show that wine have different antioxidant effect; the various polyphenol content and its antioxidant capacity in the wine have significant correlation with sugar-acid ratio, have highly significant correlation with grape soluble solids. Show that grape maturity have large influ- ence on wine polyphenol, though measure grape soluble solids content can quickly determine the best Chardonnay grapes harvest period and will help improve the quality of wine.