Antimicrobial activity of tea catechin against canine oral bacteria and the functional mechanisms.

J Vet Med Sci

Laboratory of Animal Microbiology, Department of Microbial Biotechnology, Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidori, Amamiya-machi Aoba-ku, Sendai, Miyagi 981-8555, Japan.

Published: October 2016

Epigallocatechin gallate (EGCG) is the major polyphenolic compound of green tea. Polyphenolic compounds were extracted from the leaf of Camellia sinensis (Japanese green tea), and the minimum inhibitory concentration against canine oral bacteria was measured. Subsequently, we investigated the inhibitory effects of polyphenolic compounds and EGCG on the growth of canine oral bacteria. EGCG showed antimicrobial activity against a model bacterium, Streptococcus mutans. Our results indicate that EGCG can inhibit the growth and biofilm formation of S. mutans and that EGCG does not interact with streptococcal lipoteichoic acid (LTA). Furthermore, our findings suggest that EGCG interacts with other component(s) of the bacterial membrane aside from streptococcal LTA to inhibit biofilm formation and damage biofilms.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5059371PMC
http://dx.doi.org/10.1292/jvms.16-0198DOI Listing

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