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A Study on the Physicochemical Properties of Korean Teas according to Degree of Fermentation  

Chung Young-Hee (Dept. of Food of Nutrition, Kwangju Health Science College)
Shin Mee-Kyung (Dept. of Food of Nutrition. College of Human Environmental Science, Wonkwang University)
Publication Information
The Korean Journal of Food And Nutrition / v.18, no.1, 2005 , pp. 94-101 More about this Journal
Abstract
The present study was conducted to know the physicochemical properties of Korean tea according to degree of fermention. The moisture content of green tea, blue tea, yellow tea and black tea was 2.02∼2.04%. The content of total nitrogen was 3.78 % in green tea and 3.49∼4.03% in fermented tea. The content of the mineral was highest in Ca, Mg. The content of vitamin C was 670.62 mg in green tea and 169.7∼85.03 mg in fermented tea. The content of vitamin C were increased as tea was more fermented. The composition of vitamin E and β-carotene was green tea> blue tea> yellow tea> black tea. The content of the rutin was 0.12 % in green tea and 1.37% in black tea. The content of rutin was increased with fermentation. The content of total amino acid of green tea was 2270.9 mg. The content of main amino acid of Glu, Asp, and Leu was 342.01 mg, 165.32 mg, and 161.69 mg and the hightst content of Glu. The content of total amino acid of black tea was 2,219.08 mg. Total amino acid content of fermented tea increased in the order of black tea> blue tea> yellow tea, and among the tea, the content of black tea was the highest in the fermented tea. The content of caffeine was 1.17% in green tea and 1.05∼1.32% fermented tea. These results were nothing in the content of caffeine during the fermentation. The content of theanine was 0.95% in green tea and 0.73∼1.42% in fermented tea. The content of total catechin was highest in green tea, and decreased sharply as tea was more fermented. Flavonoid content of 1.05% in green tea. DPPH radical scavenge activities of the teas 4.73∼19.5% mg.
Keywords
caffeine; catechin; theanine; flavonoid; fermented tea;
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1 정동효, 김종태. 차의 과학. pp.51-53. 대광서림. 2003
2 Tar, GE. Methods of protein microcharacterization, pp.155-194. Human press, Clifton NJ. 1986
3 Park, JH, Kim, JB and Kim KS. Studies on the fatty acid composition of leaves in domestic tea plant. J. Kor. Tea Soc. 2(1):119-127. 1996
4 AOAC. Official methods of analysis 26th ed., The Association of official analytical chemists. Washington, DC. 1995
5 정란희. 만병을 고치는 녹차혁명, pp.15-16. 예담. 2003
6 Lee, YJ, Ahn, MS and Hong, KH. A study on the content of general compounds, amino acid, vitamins, catechins, alkaloids in green, oolong and balck tea. J. FD Hyg. Safety 13(4):377-382. 1998
7 SAS. SAS User's Guide. Statistics, 5th ed., SAS Institute Inc., Cary, NC, U.S.A. 1987
8 Shihoko T, Yumie M, Toshio M, Yusuie S, Kazuo I. Comparison of caffein and catechin components in infusion of various tea(green tea, ooling and black tea) and tea drinks. Nippon Shokuhin Kogyo Gakkaishi 34:24-27. 1987
9 Yamamoto M, Sano M, Matsuda N, Miyase T, Kawamoto K, Suzuki N, Yoshimura M, Tachibana H, Hakamata K. The change of epigallocatechin-3-O(3-O-methyl)gallate content in tea of diffrent varieties, tea of crop and processing method. Nippon Shokuhin Kagaku Kogaku Kaishi 48: 64-68. 2001   DOI   ScienceOn
10 김종태. 茶의 과학과 문화, pp.8-153. 도서출판 보림사. 1996
11 Ikegaya, K., Taka yanagi, H., Anan, T. Quantitative analysis of tea constituents. 嗟惜. 71:43-47. 1990
12 Kawakami M, Uchida H, Kobayashi A. Correlation between caffeine and total nitrogen in small tea leaf species and large tea leaf species. Nippon Nogeikagaku Kaishi 61:365-367. 1987   DOI
13 Shao, W., Powell, C., Clifford, M.N. The Analsis by HPLC of green, black and Pu,er teas produced in Yunnan. J. Sci. Food Ag, ic. 69:535-540. 1995   DOI
14 Choi SH. The aroma components of green tea, the products of Mt. Chiri garden. J. Korean Soc. Food Nutr. 25:478-483. 1996
15 Yeo, SG, Ahn, CW, Lee, YW, Lee, TG, Park, YH and Kim, SB. Oxidative effect of tea extracts from green tea, oolong tea and black tea. J. Soc. Food Nutr. 24(2):299-304. 1995
16 Blauch, JL and Tarka, SM. HPLC determination of caffein and theobromine in coffee, tea and instantant hot, cocoa mixes. J. Food Sci. 48:745-747. 1983   DOI
17 Blois MS. Use of dinitrosalicylic acid reagent for determination of reducing sugar. Anal. Chem. 31: 426. 1959
18 Goldberg I. Functional foods. pp.55-61. Chapman and Hall. New York. 1994
19 Choi, OJ, Choi, KH. The phyxicochemical properties of korean wild tea(Green tea, Semi-fermented tea, and Black tea) according to degree of feremtation. J. Korean Soc. Food Sci. Nutr. 32(3):356-362. 2002