| 茉莉清茶中咖啡因的测定 |
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| 引用本文： | 李淑玲.茉莉清茶中咖啡因的测定[J].宁夏农林科技,2011,52(2):77+90-77,90. |
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| 作者姓名： | 李淑玲 |
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| 作者单位： | 宁夏农林科学院农产品质监中心,宁夏,银川,750002 |
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| 摘 要： | 目的]建立一种快速、简单、准确的茉莉清茶中咖啡因的测定方法。方法]用三氯甲烷萃取茉莉清茶中的咖啡因,在276.5 nm波长下有最大吸收,其吸收值的大小与咖啡因浓度成正比,从而可定量。结果]不必沉淀蛋白质,直接测定茉莉清茶中的咖啡因,咖啡因含量在0～20μg/mL浓度范围内有良好的线性关系,相关系数r=1.000 0,相对标准偏差（RSD）为1.11%,回收率为94.8%～95.9%。结论]不必沉淀蛋白质,直接用三氯甲烷萃取茉莉清茶中咖啡因的方法,操作简单,能满足分析要求。
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| 关 键 词： | 茉莉清茶 咖啡因 测定 |
Determination of Caffeine in Jasmine Officinal |
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| LI Shu-ling.Determination of Caffeine in Jasmine Officinal[J].Ningxia Journal of Agriculture and Forestry Science and Technology,2011,52(2):77+90-77,90. |
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| Authors: | LI Shu-ling |
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| Institution: | LI Shu-ling(Center of Agricultural Products Quality Monitor,Ningxia Academy of Agriculture and Forestry Sciences,Yinchuan,Ningxia 750002) |
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| Abstract: | Objective] The aim was to establish a rapid method for determination of caffeine in Jasmine officinal.Method] Caffeine was extracted by chloroform and determined by ultraviolet spectrophotometer with wave 276.5 nm in Jasmine officinal.Result] Do without deposit protein,determine caffeine directly in Jasmine Officinal,the linear region was 0～20 μg/mL,regression coefficient was 1.000 0.The recover ratio was between 94.8% and 95.9%,RSD=1.11%.Thus the method was applied to determine caffeine and obtained a good result.Conclusion] Do without deposit protein;determine caffeine directly in Jasmine officinal was a convenient method. |
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| Keywords: | Jasmine officinal Caffeine Determine |
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