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Official Journal of the Japan Wood Research Society

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Green color protection of bamboo culms using one-step alkali pretreatment-free process

Abstract

This study evaluated the protection effectiveness of alcohol-borne reagents for the green color of ma bamboo (Dendrocalamus latiflorus Munro) and moso bamboo (Phyllostachys pubescens Mazel). The results show that the types and concentrations of alcohol-borne reagents, the kinds of solvent, and the conditions of treatment greatly affected the green color of these two bamboo species. Without alkali pretreatment, an excellent green color protection (a* = −14.5) was obtained when the ma bamboo culms were treated with 0.5% methanol-borne copper chloride (CuCl2) at 60°C for 30 min. Similar results were also obtained when ma bamboo culms were treated with 0.5% methanol-borne copper nitrate [Cu(NO3)2] at 60°C for 2 h (a* = −13.5). For moso bamboo, an attractive green color in the bamboo culms was achieved by treating the specimens with 1% methanol-borne copper acetate [Cu(CH3COO)2] at 60°C for 30 min. The a* value of treated specimens was −13.3. In addition, results demonstrated that ultrasonic treatment was more effective on green color protection than conventional water bath treatment. When moso bamboo was treated with 1% copper acetate at 60°C in an ultrasonic bath for only 15 min, a remarkable green color with an a* value of −13.6 was obtained on the bamboo epidermis.

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Correspondence to Shang-Tzen Chang.

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Wu, J., Chung, M. & Chang, S. Green color protection of bamboo culms using one-step alkali pretreatment-free process. J Wood Sci 51, 622–627 (2005). https://doi.org/10.1007/s10086-005-0698-7

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Key words

  • Green color protection
  • Bamboo
  • Alkali pretreatment-free process
  • Alcohol-borne reagents
  • Ultrasonic treatment