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자료유형
학술저널
저자정보
저널정보
한국식품영양과학회 Journal of Food Science and Nutrition Nutraceuticals and Food Vol.8 No.2
발행연도
2003.6
수록면
185 - 190 (6page)

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Gamma irradiation was used as part of a new processing method to produce a brighter-colored - mildflavored green tea leaf extract that retained all of its physiological activities. Dried green tea leaf was extracted with 70% ethanol - gamma irradiated at 0, 5, 10, 20 kGy. Hunter color L^*- and a^*-values were increased with irradiation in a dose-dependent manner, which was a color range from dark brown to bright yellow. However, the irradiation effect gradually disappeared during 3 weeks of storage, with color reverting to that of untreated samples. There was no difference in the radical scavenging - tyrosinase inhibition effect by irradiation. Among antioxidants used, ascorbic acid was the most effective against color reversion. In contrast, cysteine was shown to protect the effect of color change with irradiation. Results indicated that enhanced color of irradiated green tea leaf extract can be effectively controlled by additives such as ascorbic acid - a low storage temperature.

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Abstract

INTRODUCTION

MATERIALS AND METHODS

RESULTS AND DISCUSSION

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