UV SPECTROPHOTOMETRIC DETERMINATION OF THEOBROMINE AND CAFFEINE IN COCOA BEANS

被引：24

作者：

LI, S ^{[1
]}

BERGER, J ^{[1
]}

HARTLAND, S ^{[1
]}

机构：

[1] SWISS FED INST TECHNOL,DEPT CHEM ENGN & IND CHEM,CH-8092 ZURICH,SWITZERLAND

来源：

ANALYTICA CHIMICA ACTA | 1990年 / 232卷 / 02期

关键词：

D O I：

10.1016/S0003-2670(00)81263-5

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A rapid, simple and accurate method for individually determining theobromine and caffeine in cocoa beans is presented. Caffeine alone is completely extracted into chloroform from an aqueous solution at a pH between 12.5 and 12.7, and can be determined by UV spectrophotometry at 275.9 nm. For the theobromine remaining in the aqueous solution, a wavelength of 272.7 nm is used. The results were reproducible with a relative standard deviation of about 0.65%. © 1990.

引用

页码：409 / 412

页数：4

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