Effect of light irradiation on the antibacterial activity of compounded papers containing wasted tea leaves |
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| Authors: | Tetsuya Takahashi Yuji Aso Wakako Kasai Tetsuo Kondo |
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| Institution: | (1) Analytical Chemistry Division, National Institute of Standards and Technology, Gaithersburg, MD 20899-8392, USA;(2) Analytical Chemistry Division, National Institute of Standards and Technology, Gaithersburg, MD 20899-8390, USA |
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| Abstract: | The endurance of the antibacterial properties of compounded papers containing wasted green tea leaves needs to be examined
before considering these papers for long-term use. Hence, compounded papers containing 60 wt% wasted green tea leaves were
irradiated for 1–200 h using a xenon lamp to examine the effect of irradiation on antibacterial properties of the paper. Irradiation
for 20 h (cumulative ultraviolet dose at 365 nm, 6.67 × 106 J/m2) or longer was found to greatly increase the antibacterial activity of the paper to a level at which no bacterial cell was
confirmed to be viable. The paper was also covered with various glass filters and irradiated for 1 h. Irradiation exclusively
with visible rays did not significantly affect the antibacterial activity of the paper, whereas irradiation exclusively with
ultraviolet rays, even for a short time, greatly increased the antibacterial activity. |
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