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Quality Properties of Tea Extracts Prepared with Persimmon Flowers  

Chung, Hun-Sik (Department of Food Science and Technology, and Food & Bio-industry Research Institute, Kyungpook University)
Youn, Kwang-Sup (Department of Food Science and Technology, Catholic University of Daegu)
Seong, Jong-Hwan (Department of Food Science and Technology, Pusan National University)
Moon, Kwang-Deog (Department of Food Science and Technology, and Food & Bio-industry Research Institute, Kyungpook University)
Publication Information
Food Science and Preservation / v.14, no.2, 2007 , pp. 148-153 More about this Journal
Abstract
The chemical components of flesh persimmon flowers (petal and calyx), and the qualify of hot-water extracts (teas) prepared from powders of these flower parts, were investigated In flesh petal and calyx, the contents of moisture, crude protein, crude lipid, and carbohydrate were 84.8% 0.4% 0.3% and 13.7% respectively. The values were not significantly different when the two tissues were compared. In petal and calyx respectively, the crude ash values were 0.5% and 1.1% of flesh weights, the vitamin C content were 192.3mg% and 392.7ng%, the flavonoid levels were 98.4 mg% and 355.2mg% and the carotenoid content were 0.8mg% and 3.8mg%. Hot air and freeze drying methods applied to petals, prior to powder preparation, did not affect the levels of soluble solids or soluble annins. Extract from calyx had higher L values, higher ${-\alpha}$ values, more soluble tannins, greater 1,1-diphenyl-2-picrylhy-drazylradical-scavenging activities, me lower pH values, than did exracts from petal. Fructose and glucose were higher in petal extract than in calyx extract, but sucrose was higher in calyx extracts. Extract of freeze-dried powdered petals had significantly higher free sugar levels than did exracts from petals dried with hot air. The major organic acids in extracts were citric acid, oxalic acid, and malic acid. The levels of organic acids were inversely related to free sugar levels in all flower parts and after all drying methods tested. Sensory tests of aroma, taste and overall acceptability yielded scores above medium for all teas, regardless of the flower part powdered, or the drying method used. The results show that the petal and calyx of persimmon may be used to make tea and perhaps other foods.
Keywords
persimmon flower; tea; quality property; antioxidant activity;
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Times Cited By KSCI : 14  (Citation Analysis)
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