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Confirmation of Safety and Long-term Durability of CCC (Chitosan-Copper Complex) as An Environmental Friendly Wood Preservatives

确认 CCC（壳聚糖-铜复合物）作为环保型木材防腐剂的安全性和长期耐久性

基本信息

批准号：
12556028
负责人：
FURUKAWA Ikuo
金额：
$ 2.43万
依托单位：
Tottori University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

项目摘要

The purpose of this study is to confirm safety and long-term durability of a Chitosan-Copper Complex (CCC) treated woods based on the chemical safety tests and the field exposure testsThe safety of CCC was investigated at a private inspection sector of Safety and Evaluation of Foods and Agricultural Chemicals Center Ltd. for following five items, that is, poison test for eating (LD50), ocular irritation test, skin irritation test, skin allergy test and genetic-poison test. CCC showed strong positive reaction on ocular irritation test. CCC of LD50 test is much larger than 2000ppm. It was confirmed that CCC was very safety and able to recognized as an environmental friendly wood preservatives.Durability of the CCC treated woods, such as CCC impregnated wood-pegs and a CCC treated Sugi-log bench, was evaluated by the field tests. Wood pegs buried for 7 years near the termite colony showed no damages, and the log bench exposed for four years in outdoor also showed no signs of biodegradation.So far as the mechanism of anti-biodeterioration against termite and wood fungi attacks, the CCC microdistribution within the treated woods seemed to play an important role. The copper-elements of the CCC was selectively deposited within the free space of "intercellular spaces networks" which were formed between ray tissue and axial tracheids, within resin canal and between ray cells. This selective deposition of copper elements works very effectively against brown rot fugal attack and termite attack.These obtained results were presented at the fifth International Pacific Regional Wood Anatomist Conference (PRWAC) and the fourth International Wood Science Seminar (IWSS), both were held at Indonesia in 2002.

本研究的目的是在化学安全性试验和野外暴露试验的基础上，确定壳聚糖-铜络合物(CCC)处理木材的安全性和长期耐用性。在食品和农业化学品安全评价中心有限公司的一家私营检查部门对CCC的安全性进行了调查，包括食用毒性试验(LD50)、眼刺激试验、皮肤刺激试验、皮肤过敏试验和遗传毒物试验。CCC眼刺激试验呈强阳性反应。半数致死量(LD50)远大于2000ppm。结果表明，CCC是一种非常安全的环保型木材防腐剂，并通过田间试验评价了CCC浸渍木桩和经CCC处理的杉木木材的耐久性能。在白蚁群落附近埋藏7年的木桩未见损伤，露天4年的原木板凳也未见生物降解迹象。因此，就抗白蚁和木真菌侵袭的抗生物退化机制而言，处理木中的CCC微分布似乎起到了重要作用。CCC中的铜元素选择性地沉积在射线组织与轴向管胞之间、树脂管内和射线细胞之间形成的“细胞间隙网络”的自由空间内。这种铜元素的选择性沉积对褐腐病真菌攻击和白蚁攻击非常有效。这些结果在2002年在印度尼西亚举行的第五届国际太平洋地区木材解剖学家会议(PRWAC)和第四届国际木材科学研讨会(IWSS)上公布。