국산 녹차의 채취시기별 주요 화학성분과 항산화 특성을 평가하기 위하여 폴리페놀, 플라보노이드, 데아닌, 유리아미노산 함량과 항산화 및 라디칼 소거능에 대하여 조사하였다. 총 폴리페놀 함량은 중작 37.16 mg/g로 가장 높았으며, 다음으로 세작 24.65 mg/g, 대작 23.28 mg/g, 우전 19.55 mg/g 순이었으며, 총 플라보노이드는 대작이 350.83 mg%으로 중작 270.36 mg%, 세작 256.88 mg%, 우전 220.8

Korean green tea has been claimed to have health-promoting effects, which may be related to the antioxidant activity in vitro. Korean green teas (Woojeon, WJ ; Sejak, SJ ; Jungjak, JJ ; Daejak, DJ) were subjected to different harvested times and yet little research has examined their bioactive compounds. To assess the effect of this different harvested times on nutritional and health-related properties such as Korean green tea polyphenols, flavonoids, theanine and free amino acids, antioxidant activities and radical scavenging activities were determined. Total polyphenols in JJ (37.16 mg/g) was higher than in other products (WJ, 19.55 ; SJ 24.65 ; DJ, 23.28 mg/g). Contents of flavonol and flavone glycosides were the highest at DJ (350.83 mg%) as compared to WJ (220.81), SJ (256.88) and JJ (270.36 mg%). Contents of theanine and total free amino acids were the highest at WJ (14.11, 23.62 mg/g, respectively), but decreased thereafter. Antioxidant activities were higher in JJ and DJ, using the linoleic acid peroxidation, DPPH and ABTS free radical-scavenging activities. However, WJ and SJ had less active antioxidant activity and free radical-scavenging activity. Reducing powers were increased depend on the concentration of extracts. Antioxidant activity and free radical-scavenging activity of JJ and DJ seemed to relate with total polyphenol and flavonoid contents.

• 강성구
• 손미예