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rdf:type
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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 ± 0.02 and 1.23 ± 0.03 %, respectively).
- 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 ± 0.02 and 1.23 ± 0.03 %, respectively). (en)
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Title
| - DETERMINATION OF CAFFEINE CONTENTS IN VIETNAMESE AND CZECH COFFEE
- DETERMINATION OF CAFFEINE CONTENTS IN VIETNAMESE AND CZECH COFFEE (en)
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skos:prefLabel
| - DETERMINATION OF CAFFEINE CONTENTS IN VIETNAMESE AND CZECH COFFEE
- DETERMINATION OF CAFFEINE CONTENTS IN VIETNAMESE AND CZECH COFFEE (en)
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skos:notation
| - RIV/70883521:28110/12:43869408!RIV13-MSM-28110___
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http://linked.open...avai/riv/aktivita
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http://linked.open...avai/riv/aktivity
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http://linked.open...vai/riv/dodaniDat
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http://linked.open...aciTvurceVysledku
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http://linked.open.../riv/druhVysledku
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http://linked.open...iv/duvernostUdaju
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http://linked.open...titaPredkladatele
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http://linked.open...dnocenehoVysledku
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http://linked.open...ai/riv/idVysledku
| - RIV/70883521:28110/12:43869408
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http://linked.open...riv/jazykVysledku
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http://linked.open.../riv/klicovaSlova
| - Vietnamese coffee, Czech coffee, caffeine, liquid-liquid extraction, derivative spectrophotometry, UV/VIS.natamycin, trvanlivé fermentované salámy, HPLC-MS (en)
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http://linked.open.../riv/klicoveSlovo
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http://linked.open...ontrolniKodProRIV
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http://linked.open...v/mistoKonaniAkce
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http://linked.open...i/riv/mistoVydani
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http://linked.open...i/riv/nazevZdroje
| - Bezpečnosť a kontrola potravín
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http://linked.open...in/vavai/riv/obor
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http://linked.open...ichTvurcuVysledku
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http://linked.open...cetTvurcuVysledku
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http://linked.open...UplatneniVysledku
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http://linked.open...iv/tvurceVysledku
| - Kráčmar, Stanislav
- Kubáň, Vlastimil
- Phan, Thi Thanh Dieu
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http://linked.open...vavai/riv/typAkce
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http://linked.open.../riv/zahajeniAkce
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number of pages
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http://purl.org/ne...btex#hasPublisher
| - Slovenská poľnohospodárska univerzita v Nitre
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https://schema.org/isbn
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http://localhost/t...ganizacniJednotka
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