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논문 기본 정보

자료유형
학술저널
저자정보
Kwan-Jeong Song (제주대학교) Dong-Chul Beak (제주대학교) You-Wang Kim (제주대학교) Young-Geol Kim (장원건설) Min-Seok Lee (장원건설) Sam-Pin Lee (계명대학교) Chan-Shick Kim (제주대학교)
저널정보
한국식품영양과학회 Journal of Food Science and Nutrition Journal of Food Science and Nutrition Vol.15 No.3
발행연도
2010.9
수록면
229 - 232 (4page)

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초록· 키워드

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Caffeine and catechins from the Yabukita, Yutakamidori, Saemidori, Okumidori, and Fushun varieties of tea leaves picked during different harvesting seasons from April to October were evaluated using HPLC. Total content of catechins increased greatly with the later harvesting time of tea leaves (i.e., picking the leaves in September versus in April) and decreased slightly after September. Yabukita tea leaves picked in August contained 43.1 ㎎% catechins including EGC, EC, ECG, and EGCG, with the ECGC levels constituting greater than 50% of those four compounds. Yutakamidori and Okumidori varieties picked in September contained the highest catechin values, at 43.6 ㎎% and 31.0 ㎎%, respectively. Fushun and Saemidori varieties contained lower catechin concentrations of 14.5 ㎎% (July) and 11.7 ㎎% (August) compared to other varieties. The EGCG levels gradually decreased in the late harvesting season, while levels of the other catechins, EC, EGC, and ECG, gradually increased. All varieties of green tea showed a gradual decrease in caffeine content toward the end of our harvesting efforts in October, with levels of 58~68 ㎎% in April and 28~57 ㎎% in October. Yabukita, Saemidori, and Okumidori varieties reached their highest caffeine levels in late spring/early summer, with Yabukita and Okumidori varieties reaching a high of 73.4% and 63.5% caffeine, respectively, in May, and Saemidori at 64.0% in June. In particular, Fushun still contained high caffeine of 66.8 ㎎% (September) during the late harvesting season.

목차

Abstract
INTRODUCTION
MATERIALS AND METHODS
RESULTS AND DISCUSSION
ACKNOWLEDGEMENTS
REFERENCES

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