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http://dx.doi.org/10.3746/jkfn.2017.46.5.639

Antioxidant Compounds and Activities as well as Caffeine Content of Aronia melanocarpa Leaf Tea according to Pan-Roasting Conditions  

Park, Soojin (Department of Food and Nutrition, Semyung University)
Jung, Sunghoon (Department of Food and Nutrition, Semyung University)
Publication Information
Journal of the Korean Society of Food Science and Nutrition / v.46, no.5, 2017 , pp. 639-645 More about this Journal
Abstract
Differences in bioactive compounds and antioxidant activities of aronia leaf (AL) extracts according to manufacturing conditions such as different number of pan-roasting and different temperatures were investigated. Both total polyphenolic compounds and total flavonoids contents were the highest in six time-pan-roasted AL tea extract ($37.96{\pm}0.48mg$ catechin equivalent/g and $19.96{\pm}0.44mg$ quercetin equivalent/g, respectively) among four tea samples. Antioxidative activities were also the highest in six time-pan-roasted AL tea extract with $IC_{50}$ 0.43 mg/mL and $IC_{50}$ 0.27 mg/mL based on DPPH and ABTS radical scavenging activities, respectively. HPLC analysis revealed that AL tea infusion did not have caffeine regardless of manufacturing conditions, whereas green tea infusion had 3.8 mg/g caffeine. Results demonstrated that AL tea can be expected as caffeine free leaf tea containing antioxidant benefits. Moreover, specific pan-roasting conditions of AL tea would be very important for its functional and sensory attributes.
Keywords
aronia leaf; antioxidant; polyphenol; flavonoids; caffeine free tea;
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