44E-19 |
Antioxidant activities of Korean health tea products by chemiluminescence photon detection method: Correlation with catechin content in normal drinking condition |
S. K. CHUNG1, Y. C. Kim1, W. S. Jeong2, K. Iwai3, and H. Matsue3. (1) Dept. of Food Science & Technology, Kyungpook National Univ., Pook-ku Sankyuk-dong 1370, Taegu, South Korea, (2) Dept. of Food Science, Rutgers, The State Univ. of New Jersey, 65 Dudley Rd., New Brunswick, NJ 08901, (3) Aomori Advanced Industrial Technology Center, Japan Recently, the consumption of various health tea products is becoming popular in Korea. The antioxidant activity of 26 health tea products including 14 infusion-type, 9 solid extraction type and 3 powder type teas was determined by XYZ dish method with chemiluminescence photon detection. Catechin content of the tea products was measured by HPLC. The results of XYZ dish method were compared with DPPH method for antioxidant activity. Among the infusion type teas, KIT2, KIT7, KIT11 and KIT12 -which contain green tea leaves- showed much stronger antioxidant activities than other teas. The solid extraction and powder type teas showed much lower antioxidant activities than the infusion type tea. There was a high correlation (r > 0.89) between catechin content and antioxidant activity in the infusion type. The antioxidant activity and catechin content increased by infusion time, but kept constant over 3 minutes of infusion time. DPPH radical scavenging activities of 26 kinds of teas had good correlation (r > 0.90) with the activities by XYZ method. These results suggest that the XYZ dish method is fast, convenient, and reliable for antioxidant activity evaluation of various tea products in normal drinking condition.
Session 44E, Nutraceuticals & Functional Foods
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