Effects of ultraviolet radiation on the color of compounded papers containing wasted tea leaves

Tetsuya Takahashi, Wakako Kasai, Tetsuo Kondo

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Influence of ultraviolet irradiation on papers containing wasted tea leaves was studied. Ultraviolet irradiation generally caused reddish coloration. Irradiation under dry atmosphere caused stronger coloration than under ambient conditions. Presence of oxygen did not cause significant difference in coloration. Thin-layer chromatographic analysis showed disappearance of chlorophylls a and b, and did not disappearance of theaflavin by UV irradiation. The results strongly suggest that the coloration is caused by photochemical conversions of catechins to reactants (theaflavin-like compounds).

Original languageEnglish
Pages (from-to)261-266
Number of pages6
JournalJournal of Fiber Science and Technology
Issue number10
Publication statusPublished - Jan 1 2010


All Science Journal Classification (ASJC) codes

  • Chemical Engineering (miscellaneous)
  • Materials Science (miscellaneous)
  • Polymers and Plastics
  • Industrial and Manufacturing Engineering

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