DETERMINATION OF CAFFEINE CONTENTS IN VIETNAMESE AND CZECH COFFEE

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F12%3A43869408" target="_blank" >RIV/70883521:28110/12:43869408 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
DETERMINATION OF CAFFEINE CONTENTS IN VIETNAMESE AND CZECH COFFEE
Original language description
Caffeine contents were determined in 10 commercial coffee brands (5 Vietnamese and 5 Czech) using 3 different methods, including direct conventional UV/VIS spectrophotometry at 273.2 nm, 1st order derivative UV/VIS spectrophotometry of the sample solution using peak to peak method, and liquid-liquid extraction using chloroform (CHCl3) as an extracting solvent. Caffeine contents measured by conventional UV/VIS spectrophotometry fall out of the documented range (2.9 ? 0.05 - 15 ? 0.07 %) while those determined by derivative spectrophotometry and by CHCl3 were found to be within the documented range (0.48 ? 0.01 ? 3.47 ? 0.08 %) in all coffee samples. The 1st order derivative UV/VIS spectrophotometry and CHCl3 extraction can be used for determination of caffeine in Czech coffee brands (2.16 ? 0.04 and 2.06 ? 0.06 %, respectively). However, there were significant differences in the results between the two methods in Vietnamese coffee brands due to interference of complex matrices (1.62 ? 0
Czech name
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Czech description
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Publication year
2012
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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