Improving the antibacterial activity against Staphylococcus aureus of composite sheets containing wasted tea leaves by roasting

Tetsuya Takahashi, Yuji Aso, Wakako Kasai, Tetsuo Kondo

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5 Citations (Scopus)


We used various kinds of wasted tea leaves to develop composite sheets with antibacterial properties. Antibacterial tests showed that the number of viable bacterial cells for the sheet containing wasted green tea leaves was around 10:6-107 CFU/ml after 18 h culture compared to 108 CFU/ml for a tea-free sheet. This indicates that cell growth was signifi cantly inhibited. For sheets containing other types of tea leaves (oolong, black, hojicha, and pu-erh), living cells were not found, indicating that these sheets had superior antibacterial effects. Living cells were also not found in sheets containing wasted black tea leaves or roasted tea leaves at a concentration of 60% by weight after 6 h cultivation. Therefore, roasting treatment of wasted green tea leaves was examined to improve the antibacterial activity of the sheet. In particular, the focus was on structural conversion of catechins by heating.

Original languageEnglish
Pages (from-to)403-410
Number of pages8
JournalJournal of Wood Science
Issue number5
Publication statusPublished - 2010


All Science Journal Classification (ASJC) codes

  • Biomaterials

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