Effect of various extraction conditions on the phenols content and free radical scavenging activity of tea (CROSBI ID 591233)
Prilog sa skupa u zborniku | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Komes, Draženka, Karlović, Damir, Kovačević Ganić, Karin, Horžić, Dunja, Glavaš, Ivana
engleski
Effect of various extraction conditions on the phenols content and free radical scavenging activity of tea
Tea is one of the most widely consumed beverages, which provides a significant source of phenolic compounds in the diet. Phenolic compounds, especially catechins, are major tea constituents, which contribute to the antioxidative activity, antihypertensive and anticarcinogenic effects. The objective of the present study was to determine the effects of temperature (60, 80 and 100 °C), time (3, 5, 10, 15 and 30 min) and multiple extractions on the content of extracted tea phenols. Traditional herbal teas (chamomile and linden) were compared to green, black and other, less known teas, available on Croatian market, such as white, oolong and rooibos teas. According to extraction conditions, total phenols and total flavonoids in tea infusions were studied. The total phenolic content of tea infusions ranged from 410 (chamomile tea) to 2560 mg/L (green tea) and it increased with temperature increase and prolonged extraction time. 2, 2-diphenyl-1-picrylhydrazyl (DPPH) and 2, 2’-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS) assays were used to assess the antioxidant potential of tea infusions with the following order of potency: green > black > oolong > white > rooibos > linden > chamomile. Among studied teas, green tea is the most important dietary source of phenolic compounds with highest antioxidant activity
Antioxidant capacity; extraction conditions; herbal infusion; polyphenols; tea
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Podaci o prilogu
83-87.
2007.
objavljeno
Podaci o matičnoj publikaciji
Proceedings of 5th International Congress on Food Technology
Lazos, E.S.
Solun: Hellenic Association of Food Technologists
978-960-885577-4-8
Podaci o skupu
5th International Congress on Food Technology
poster
09.03.2007-11.03.2007
Solun, Grčka