Folin—Ciocalteu法测定昭通葡萄及其葡萄酒总酚含量
2014-10-21袁晓春李辅碧
袁晓春 李辅碧
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1~40 mg/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。
关键词 昭通葡萄;Folin-Ciocalteu法;测定;总酚
中图分类号 S663.1 文献标识码
A 文章编号 0517-6611(2014)33-11859-02
Measure of Total Polyphenols Content in Zhaotong Grape and Grape Wine by Folin-Ciocalteu Method
YUAN Xiao-chun1, LI Fu-bi2 (1. Zhaotong University, Zhaotong,Yunnan 657000; 2. Food and Drug Inspection Office in Zhaotong City, Zhaotong, Yunnan 657000)
Abstract [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.
Key words Zhaotong grape; Folin-Ciocalteu assay; Determination; Total polyphenol
作者簡介 袁晓春(1968- ),女,云南威信人,讲师,从事物质成分分析及其应用的研究。
收稿日期 2014-10-17
植物多酚(Plant polyphenol)又名植物单宁(Vegetable tannin),为植物体内的复杂酚类次生代谢物,具有多元酚结构,主要存在于植物的皮、根、叶、果中。植物多酚具有很强的抗氧化和清除自由基活性,水果、蔬菜、饮料等是植物多酚的主要来源[1]。因为果实汁多味美并含有丰富营养,而倍受人们青睐的葡萄[2]中就含有大量的多酚类物质。葡萄多酚是一种植物多酚类活性物质,能溶于水,易溶于甲醇、乙醇等有机溶剂,它广泛存在于葡萄籽、葡萄皮与果汁中。葡萄多酚由表儿茶酸等酚酸类、黄烷醇类、花色苷类、黄酮醇类和缩聚单宁等物质组成[3]。研究表明,葡萄中的多酚含量对葡萄酒的酿制影响很大。葡萄酒存放时多酚的各种化学反应将影响到葡萄酒的色泽、口感、品质。在葡萄酒酿制和葡萄多酚提取中,都要对多酚含量进行监控和测定。……
