Evaluation of the antioxidant properties of fruit and flavoured black teasReport as inadecuate




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European Journal of Nutrition

, Volume 50, Issue 8, pp 681–688

First Online: 01 March 2011Received: 04 November 2010Accepted: 17 February 2011

Abstract

ObjectiveAntioxidant properties of the water extracts of the commercial bagged fruit and flavoured black teas were evaluated and compared with typical black teas of C. sinensis.

MethodsFolin–Ciocalteu FC assay, cupric ion reducing antioxidant capacity CUPRAC and DPPH radical method were used for these purposes. The content of selected flavonoids and phenolic acids was also determined by high-performance liquid chromatography with tandem mass spectrometry in the negative electrospray ionization mode.

ResultsFlavoured black teas contain significantly higher level of catechins, quercetin, and rutin, while the content of chlorogenic and caffeic acids as well as naringin and hesperidin was higher in fruit teas. Supplementation with these flavonoids could reduce blood glucose. In FC and DPPH assays, the antioxidant properties of studied tea infusion increases in the order: fruit tea < flavoured black tea > premium black tea, while in CUPRAC method, some aromatized teas exhibit the highest antioxidant properties. Tea infusions with nice smell of fruits would also support the human diet with some source of antioxidants.

KeywordsFruit and flavoured teas Antioxidant properties Polyphenol content CUPRAC DPPH  Download fulltext PDF



Author: Anna Pękal - Paulina Dróżdż - Magdalena Biesaga - Krystyna Pyrzynska

Source: https://link.springer.com/







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