摘要
研究了同时测定维生素C和多酚的新方法。在体积分数38%和47.5%的乙醇、6×10-5mol/LBr2、2.5×10-3mol/LKI水溶液中,维生素C和多酚类的表观摩尔吸光系数(L.mol-1.cm-1)分别为5.42×104、8.22×105和5.46×104、8.60×105,维生素C和多酚的相对标准偏差(RSD)分别为2.5%、2.3%和2.1%、2.6%,该法用于绿豆芽、酸橙、未熟苹果、青椒中的维生素C和多酚含量测定,回收率为95.78%～100.7%。
A method to determinate the concentration of VC and polyphenols without separation was studied.In 38% and 47.5% (v/v) ethanol,6×10-5 mol/L Br2,2.5×10-3 mol/L KI aqueous solutions,the apparent molar absorptivities (L·mol-1·cm-1) of vitamin C and polyphenol are 5.42×104,8.22×105 and 5.46×104,8.60×105,and the relative standard deviations are 2.5%,2.3% and 2.1%,2.6%.This method has been successfully used to determine the contents of VC and polyphenol in mungbea sprouts,limes,unripe apples,green capsicums,and th...
出处
《分析试验室》
CAS
CSCD
北大核心
2010年第4期83-86,共4页
Chinese Journal of Analysis Laboratory
关键词
紫外分光光度法
溴氧化
维生素C
多酚
Ultraviolet spectrophotometry
Bromine
Vitamin C
Polyphenols
