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Tannase‐converted green tea catechins and their anti‐wrinkle activity in humans
Author(s) -
Hong YangHee,
Jung Eun Young,
Shin KwangSoon,
Yu KwangWon,
Chang Un Jae,
Suh Hyung Joo
Publication year - 2013
Publication title -
journal of cosmetic dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.626
H-Index - 44
eISSN - 1473-2165
pISSN - 1473-2130
DOI - 10.1111/jocd.12038
Subject(s) - tannase , wrinkle , antioxidant , gallic acid , green tea , green tea extract , chemistry , polyphenol , food science , traditional medicine , medicine , biochemistry , gerontology
Summary Background This study was performed to investigate the anti‐wrinkle effects of topical applications of green tea extract with high antioxidant activity by tannase treatment. Increases in gallic acid ( GA ), (−)‐epigallocatechin ( EGC ), and (−)‐epicatechin ( EC ) were observed in the green tea extract after tannase treatment. Objectives This study was performed to investigate the anti‐wrinkle effects of topical applications of green tea extract exhibiting high antioxidant activity after tannase treatment. Methods Subjects, randomly divided into two groups, received the application of either tannase‐converted green tea extract ( TGE ) or normal green tea extract ( NGE ) on their crow's feet for 8 weeks. The anti‐wrinkle effects were evaluated with two methods: (i) self‐assessment; and (ii) average roughness of skin surface ( R a , R z , and R t value) using skin replica and Skin‐Visiometer SV 600. Results The scavenging abilities of TGE against radicals were significantly higher compared to NGE . The evaluation of skin wrinkle index values after 8 weeks of treatment showed that reductions of R a , R z , and R t values in the TGE group were significantly greater than in the NGE group, which indicated that tannase treatment improved the anti‐wrinkle effects of green tea extract. According to the overall ratings for wrinkle treatment by applying the formulations, most of the TGE group (63.60%) reported marked or moderate improvement in wrinkles compared with only 36.30% of the NGE group. Conclusion Tannase treatment can improve the antioxidant activity of green tea extract, conferring anti‐wrinkle activities. These results suggest that TGE may have beneficial properties as an anti‐wrinkle agent.