Authenticity evaluation of tea-based products
H. Čížková,
M. Voldřich,
J. Mlejnecká and
F. Kvasnička
Additional contact information
H. Čížková: Helena Čížková, Michal Voldřich, Jana Mlejnecká and František Kvasnička Department of Food Preservation and Meat Technology, Faculty of Food and Biochemical Technology, Institute of Chemical Technology in Prague, Prague, Czech Republic
M. Voldřich: Helena Čížková, Michal Voldřich, Jana Mlejnecká and František Kvasnička Department of Food Preservation and Meat Technology, Faculty of Food and Biochemical Technology, Institute of Chemical Technology in Prague, Prague, Czech Republic
J. Mlejnecká: Helena Čížková, Michal Voldřich, Jana Mlejnecká and František Kvasnička Department of Food Preservation and Meat Technology, Faculty of Food and Biochemical Technology, Institute of Chemical Technology in Prague, Prague, Czech Republic
F. Kvasnička: Helena Čížková, Michal Voldřich, Jana Mlejnecká and František Kvasnička Department of Food Preservation and Meat Technology, Faculty of Food and Biochemical Technology, Institute of Chemical Technology in Prague, Prague, Czech Republic
Czech Journal of Food Sciences, 2008, vol. 26, issue 4, 259-267
Abstract:
This study proposes a method for estimating the content of tea in tea-based products. Broadly, this methodology is based on selecting chemical markers of the quality and authenticity of tea (and, therefore, of tea-based products), optimising the relevant analytical methods, and determining variations (type, origin, quality) among samples of green and black leaf teas. The contents of the selected markers (theobromine, caffeine, theanine, and total polyphenols) in tea-based products (iced teas, instant teas) were determined. Then, the dry tea content in these products, expressed as the equivalent amount of dry tea leaves, was calculated on the basis of two sets of mean data for these analytes: average literature data, and the mean experimental data obtained with our samples of leaf tea. With regards to the latter, we propose to use of the following averages for caffeine, theobromine, theanine, and polyphenols: for 100 g of black tea-based products 1.9 g, 0.13 g, 1.3 g, and 9.1 g, respectively; for 100 g of green tea-based products 1.9 g, 0.16, 1.7 g, and 14.7 g, respectively. Using this method, we found that approximately one third of the analysed samples failed to meet the tea extract levels required by German and Austrian legislations, while about 10% did not comply with the less demanding Czech legislative requirements.
Keywords: tea; tea-based products; authenticity; quality (search for similar items in EconPapers)
Date: 2008
References: View complete reference list from CitEc
Citations:
Downloads: (external link)
http://cjfs.agriculturejournals.cz/doi/10.17221/10/2008-CJFS.html (text/html)
http://cjfs.agriculturejournals.cz/doi/10.17221/10/2008-CJFS.pdf (application/pdf)
free of charge
Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.
Export reference: BibTeX
RIS (EndNote, ProCite, RefMan)
HTML/Text
Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlcjf:v:26:y:2008:i:4:id:10-2008-cjfs
DOI: 10.17221/10/2008-CJFS
Access Statistics for this article
Czech Journal of Food Sciences is currently edited by Ing. Zdeňka Náglová Ph.D.
More articles in Czech Journal of Food Sciences from Czech Academy of Agricultural Sciences
Bibliographic data for series maintained by Ivo Andrle ().