广州化工
廣州化工
엄주화공
GUANGZHOU CHEMICAL INDUSTRY AND TECHNOLOGY
2012年
24期
124-125
,共2页
碧螺春%咖啡因%测试
碧螺春%咖啡因%測試
벽라춘%가배인%측시
tea of Biluochun%caffeine%determinate
用热水浸提法提取6个洞庭碧螺春茶样品中的咖啡因,采用紫外分光光度法,以咖啡因为标准品,蒸馏水为空白对照,于276 nm波长处分别测定对照品和供试品溶液的吸光度,按标准曲线计算咖啡因含量。回归方程为y=47.945x＋0.0015,r=0.9999。平均回收率为99.68%,相对标准偏差RSD为0.23%。该方法简单、快速、准确。
用熱水浸提法提取6箇洞庭碧螺春茶樣品中的咖啡因,採用紫外分光光度法,以咖啡因為標準品,蒸餾水為空白對照,于276 nm波長處分彆測定對照品和供試品溶液的吸光度,按標準麯線計算咖啡因含量。迴歸方程為y=47.945x＋0.0015,r=0.9999。平均迴收率為99.68%,相對標準偏差RSD為0.23%。該方法簡單、快速、準確。
용열수침제법제취6개동정벽라춘다양품중적가배인,채용자외분광광도법,이가배인위표준품,증류수위공백대조,우276 nm파장처분별측정대조품화공시품용액적흡광도,안표준곡선계산가배인함량。회귀방정위y=47.945x＋0.0015,r=0.9999。평균회수솔위99.68%,상대표준편차RSD위0.23%。해방법간단、쾌속、준학。
Caffeine in 6 samples of Dongting spring tea was extracted with hot water.Using ultraviolet spectrophotometry,the caffeine as a standard and distilled water to be blank test,the determination of controlled products and solution absorbency in 276 nm,and curved calculation of caffeine content according to the standard.The standard equation was y=47.945x+0.0015,regression coefficient was 0.9999.The recover ratio was 99.68% and RSD=0.23%.The method was simple,rapid,and accurate.
