Czech J. Food Sci., 2013, 31(5):483-500 | DOI: 10.17221/443/2012-CJFS

Distribution patterns of polyphenols and alkaloids in instant coffee, soft and energy drinks, and teaOriginal Paper

Noelia MANCHÓN, Laura MATEO-VIVARACHO, Matilde D'ARRIGO, Ana GARCÍA-LAFUENTE, Eva GUILLAMÓN, Ana VILLARES, Mauricio Ariel ROSTAGNO
Food Quality Centre, National Institute for Agricultural Research and Experimentation (INIA), Soria, Spain

A previously developed method of HPLC-DAD-Fl has been used for the determination of phytochemical profiles in different types of drinks: instant coffee, soft drinks, energy drinks, and different types of tea (green, white, black, and red tea). Using data on the concentrations of 20 main phytochemicals (phenolic acids, flavan-3-ols, flavonols, flavones, and alkaloids) it was possible to identify most of the sample types. Chlorogenic and caffeic acids, and caffeine are the main target compounds in instant coffee; in soft and energy drinks, only caffeine was found. Tea has a more complex phytochemical composition. Unfermented tea is mainly composed of flavan-3-ols and alkaloids, with a high caffeine concentration. Black tea is composed of alkaloids and low levels of flavan-3-ols, which are affected by oxidative reactions during the fermentation. Flavonols are present in lower concentrations in all kinds of teas. The identified phytochemical distribution patterns were used to correctly differentiate instant coffee, soft drinks, energy drinks, unfermented tea and fermented tea (within fermented tea, black tea from red tea can also be differentiated).

Keywords: phytochemical profile; phenolic compounds; beverages; antioxidants; caffeine phenolic acids; flavan-3-ols; catechins; flavones; flavonols; alkaloids

Published: October 31, 2013  Show citation

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MANCHÓN N, MATEO-VIVARACHO L, D'ARRIGO M, GARCÍA-LAFUENTE A, GUILLAMÓN E, VILLARES A, ROSTAGNO MA. Distribution patterns of polyphenols and alkaloids in instant coffee, soft and energy drinks, and tea. Czech J. Food Sci. 2013;31(5):483-500. doi: 10.17221/443/2012-CJFS.
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