摘要
[目的] Folin-Ciocalteu法测定葡萄总酚含量,为昭通葡萄生产及其酿制工艺提供科学依据.[方法]采用甲醇作溶剂,超声提取葡萄总酚,以Folin-Ciocalteu试剂和50 g/L Na2CO3溶液处理,在765 nm处测其吸光度.[结果]以没食子酸为标准,质量浓度在1~40mg/L范围内与吸光度线性关系良好(r =0.999 5).平行测定(n=6)葡萄总酚含量,RSD在1.1% ~1.6%,对葡萄和葡萄酒的加标回收率试验结果分别为98.8%、98.3%,RSD依次为1.8%、2.0%.[结论]该法操作简便,重复性好,结果准确可靠,可用于测定葡萄及葡萄酒中总酚含量.
[Objective] In order to provide scientific basis for production and brewing of Vitis vinifera in Zhaotong,the total polyphenol content in grapes was measured by Folin-Ciocalteu method.[Method] Using methyl alcohol as the solvent,total polyphenols of Vitis vinifera was extracted by supersonic method,then added Folin-Ciocalteu reagent and 50 g/L Na2CO3 solution,and measured the absorbancy at 765 nm.[Result] Basing on gallic acid,the mass concentration had an obvious linear relation (r =0.999 5) with absorbancy within the scope of 1-40 mg/L.The parallel determination (n =6) of total polyphenol results were that,when RSD was between 1.1% to 1.6%,the adding standard recovery of Vitis vinifera and grapes wine were 98.8%,98.3%,RSD 1.8%,2.0%.[Conclusion] This method is convenient,repeatable and faithful,which can be used for determination of polyphenol in grapes and grape wine.
出处
《安徽农业科学》
CAS
2014年第33期11859-11860,11862,共3页
Journal of Anhui Agricultural Sciences