Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/68875
Type: Artigo de periódico
Title: HPLC determination of caffeine in tea, chocolate products and carbonated beverages
Author: De Camargo, MCR
Toledo, MCF
Abstract: Different brands of mate and black tea, chocolate products and carbonated beverages available on the Brazilian market were analysed for caffeine by high-performance Liquid chromatography with a UV-vis detector at 254 nm. The column was a reverse phase C18 and the mobile phase consisted of methanol-water (30:70, v/v), acetonitrile-water (10:90, v/v) and methanol-water (25:75, v/v) for tea, chocolate products and soft drinks respectively. Caffeine content ranged from 1.05 to 15.83 mg per cup in mate tea, from 32.21 to 36.23 mg per cup in black tea, from 0.14 to 0.95 mg g(-1) in chocolate products from 2.73 to 7.49 mg per can in guarana-type soft drinks and from 19.81 to 45.89 mg per can in cola soft drinks. These data indicate that the levels of caffeine in Brazilian teas, chocolates and soft drinks are within the ranges reported for similar products in other countries. (C) 1999 Society of Chemical Industry.
Subject: caffeine
tea
carbonated beverages
cocoa
chocolate products
HPLC
Country: Inglaterra
Editor: John Wiley & Sons Ltd
Rights: fechado
Identifier DOI: 10.1002/(SICI)1097-0010(199910)79:13<1861
Date Issue: 1999
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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