About: DETERMINATION OF CAFFEINE CONTENTS IN VIETNAMESE AND CZECH COFFEE

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
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)
Title	DETERMINATION OF CAFFEINE CONTENTS IN VIETNAMESE AND CZECH COFFEE DETERMINATION OF CAFFEINE CONTENTS IN VIETNAMESE AND CZECH COFFEE (en)
skos:prefLabel	DETERMINATION OF CAFFEINE CONTENTS IN VIETNAMESE AND CZECH COFFEE DETERMINATION OF CAFFEINE CONTENTS IN VIETNAMESE AND CZECH COFFEE (en)
skos:notation	RIV/70883521:28110/12:43869408!RIV13-MSM-28110___
http://linked.open...avai/riv/aktivita	S
http://linked.open...avai/riv/aktivity	S
http://linked.open...vai/riv/dodaniDat	2013
http://linked.open...aciTvurceVysledku	Kubáň, Vlastimil Kráčmar, Stanislav Phan, Thi Thanh Dieu
http://linked.open.../riv/druhVysledku	D - Článek ve sborníku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Tomáše Bati ve Zlíně / Fakulta technologická
http://linked.open...dnocenehoVysledku	130560
http://linked.open...ai/riv/idVysledku	RIV/70883521:28110/12:43869408
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Vietnamese coffee, Czech coffee, caffeine, liquid-liquid extraction, derivative spectrophotometry, UV/VIS.natamycin, trvanlivé fermentované salámy, HPLC-MS (en)
http://linked.open.../riv/klicoveSlovo	liquid-liquid extraction HPLC-MS caffeine Czech coffee UV/VIS.natamycin Vietnamese coffee derivative spectrophotometry trvanlivé fermentované salámy
http://linked.open...ontrolniKodProRIV	[7C2DA95F4056]
http://linked.open...v/mistoKonaniAkce	Nitra
http://linked.open...i/riv/mistoVydani	Nitra
http://linked.open...i/riv/nazevZdroje	Bezpečnosť a kontrola potravín
http://linked.open...in/vavai/riv/obor	GM
http://linked.open...ichTvurcuVysledku	3 (xsd:int)
http://linked.open...cetTvurcuVysledku	3 (xsd:int)
http://linked.open...UplatneniVysledku	2012
http://linked.open...iv/tvurceVysledku	Kráčmar, Stanislav Kubáň, Vlastimil Phan, Thi Thanh Dieu
http://linked.open...vavai/riv/typAkce	EUR - Evropská
http://linked.open.../riv/zahajeniAkce	2012-03-28 (xsd:date)
number of pages	6 (xsd:int)
http://purl.org/ne...btex#hasPublisher	Slovenská poľnohospodárska univerzita v Nitre
https://schema.org/isbn	978-80-552-0769-8
http://localhost/t...ganizacniJednotka	28110

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