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Transdermal delivery of tea catechins by electrically assisted methods.
J-Y Fang1, C-F Hung, T-L Hwang
1Pharmaceutics Laboratory, Graduate Institute of Natural Products, Chang Gung University, Kweishan, Taoyuan, Taiwan. fajy@mail.cgu.edu.tw
Skin Pharmacology and Physiology
|October 26, 2005
Summary
Electrically assisted methods like electroporation and iontophoresis enhance transdermal delivery of tea catechins, with (-)-epicatechin showing selective absorption and EGCG having limited skin penetration.
Area of Science:
- Pharmacology
- Biophysics
- Dermatology
Background:
- Tea polyphenols, such as catechins, exhibit antioxidant and chemopreventive properties.
- Transdermal delivery of these compounds is challenging due to skin barrier function.
Purpose of the Study:
- To evaluate the efficacy of electroporation and iontophoresis for enhancing transdermal delivery of tea catechins.
- To elucidate the mechanisms underlying enhanced skin permeation.
Main Methods:
- Investigated transdermal permeation of (+)-catechin, (-)-epicatechin, and EGCG across porcine skin using electroporation and iontophoresis.
- Assessed skin conductivity, transepidermal water loss (TEWL), and stratum corneum lipid liposome (SCLL) fusion.
Main Results:
- Electrically assisted methods significantly improved skin permeation of catechins.
- (-)-Epicatechin demonstrated selective skin absorption over (+)-catechin.
- EGCG showed minimal skin penetration despite increased uptake.
Conclusions:
- Electroporation and iontophoresis are effective for enhancing transdermal delivery of tea catechins.
- Mechanisms include increased skin permeability and hydration, with selective absorption observed for isomers.
- EGCG's large molecular structure limits its transdermal passage.