title: Bactericidal activity of green tea extracts: the importance of catechin containing nano particles.
abstract: When we drink green tea infusion, we believe we are drinking the extract of the green tea leaves. While practically each tea bag infused in 300 mL water contains about 50 mg of suspended green tea leaf particles. What is the role of these particles in the green tea effect is the objective of this study. These particles (three different size ranges) were isolated via varying speed centrifugation and their respective inputs evaluated. Live oral bacterial samples from human volunteers have been screened against green tea extracts and macro, micro and nano sized green tea particles. The results showed that the presence/absence of the macro and mico sized tea particles in the green tea extract did not contribute much. However, the nano sized particles were characterized to be nature's nano stores of the bioactive catechins. Eradication of these nano tea particles resulted in decrease in the bactericidal property of the green tea extracts. This is a curtain raiser investigation, busting the nano as well as green tea leaf particle contribution in green tea extracts.
authors.affiliation: Department of Bioresource and Food Science, Konkuk University, Seoul 143-701, Korea.
authors.forename: Judy
authors.initials: J
authors.lastname: Gopal
authors.affiliation: Department of Bioresource and Food Science, Konkuk University, Seoul 143-701, Korea.
authors.forename: Manikandan
authors.initials: M
authors.lastname: Muthu
authors.affiliation: Environmental Microbiology, Department of Environmental Engineering, Konkuk University, Seoul 143-701, Korea.
authors.forename: Diby
authors.initials: D
authors.lastname: Paul
authors.affiliation: Department of Bioresource and Food Science, Konkuk University, Seoul 143-701, Korea.
authors.forename: Doo-Hwan
authors.initials: DH
authors.lastname: Kim
authors.affiliation: Department of Bioresource and Food Science, Konkuk University, Seoul 143-701, Korea.
authors.forename: Sechul
authors.initials: S
authors.lastname: Chun
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000494:pharmacology; D002392:Catechin / Q000737:chemistry / Q000494:pharmacology; D005260:Female; D006801:Humans; D008297:Male; D009055:Mouth / Q000382:microbiology*; D053758:Nanoparticles / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology; D013662:Tea / Q000737:chemistry*
chemical_list: D000900:Anti-Bacterial Agents; D010936:Plant Extracts; D013662:Tea; D002392:Catechin
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