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Int. J. Mol. Sci. 2007, 8(12), 1196-1205; doi:10.3390/i8121196
Article

Polyphenolic Profile and Antioxidant Activities of Oolong Tea Infusion under Various Steeping Conditions

1
, 1, 1, 1,*  and 2
Received: 15 October 2007; in revised form: 16 November 2006 / Accepted: 19 November 2006 / Published: 28 November 2007
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Abstract: The phenolic profile and antioxidant activities of oolong tea extract wereinvestigated after tea was steeped in 90 or 100 oC water for 3 or 10 min. The extractionyield increased with increasing temperature and extended steeping time. However, highertemperature and longer time (100 oC water for 10 min) led to loss of phenolics. Theaqueous extract of oolong tea (AEOT) at 100 oC for 3 min exhibited the strongestantioxidant activity. The major polyphenolic components of the AEOT were identified as(-)-epigallocatechin (EGC), (-)-epigallocatechin gallate (EGCG) and (-)-epicatechin-3-gallate (ECG). The two major catechins (EGC and EGCG) in the tea infusion contributedsignificantly to the investigated antioxidant activities [i.e., the 2,2-diphenyl-2-picrylhydrazyl hydrate (DPPH) radical scavenging and superoxide radical scavengingactivities] with high correlation values in r = 0.9486 and 0.9327 for the EGC and r =0.9592 and 0.8718 for the EGCG, respectively.
Keywords: Oolong tea; Infusion; Antioxidant activity; Phenolics Oolong tea; Infusion; Antioxidant activity; Phenolics
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Su, X.; Duan, J.; Jiang, Y.; Duan, X.; Chen, F. Polyphenolic Profile and Antioxidant Activities of Oolong Tea Infusion under Various Steeping Conditions. Int. J. Mol. Sci. 2007, 8, 1196-1205.

AMA Style

Su X, Duan J, Jiang Y, Duan X, Chen F. Polyphenolic Profile and Antioxidant Activities of Oolong Tea Infusion under Various Steeping Conditions. International Journal of Molecular Sciences. 2007; 8(12):1196-1205.

Chicago/Turabian Style

Su, Xinguo; Duan, Jun; Jiang, Yueming; Duan, Xuewu; Chen, Feng. 2007. "Polyphenolic Profile and Antioxidant Activities of Oolong Tea Infusion under Various Steeping Conditions." Int. J. Mol. Sci. 8, no. 12: 1196-1205.



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