ABSTRACT

Owing to the expensive and toxic nature of physical and chemical methods employed in the synthesis of commercially available metal nanoparticles used in wood protection, researchers are in search of non-toxic methods for nanoparticle synthesis. The present study involves biological synthesis of copper oxide nanoparticles using leaf extracts of Lantana camara L. and Nerium oleander L. The synthesised copper oxide nanoparticles were characterised using Scanning Electron Microscopy coupled with EDAX. The efficacy of formulations, containing leaf extracts and copper oxide nanoparticles, is screened against wood decay fungi Trametes hirsuta (White-rot) and Oligoporus placenta (brown-rot). Similarly, the efficacies of CuSO₄. 5H₂O (0.5%), CuO (0.5%) nanoparticle and CuO (0.5%) were also tested. Results indicated that the formulation of Lantana camara leaf extract and CuO nanoparticles effectively protected the treated rubberwood from the attack of both white-rot and brown-rot, whereas the formulation of Nerium oleander leaf extract and CuO nanoparticles protected from brown-rot attack only. Since test chemicals and leaf extracts alone were not effective against decay fungi, the protective effect of the formulation can be attributed to the synergistic effect of the intrinsic property of leaf extracts and the biocidal property of copper oxide nanoparticles resulting in an effective wood protectant.

摘要

由于在合成用于木材保护的市售金属纳米颗粒中采用的物理和化学方法昂贵且有毒，研究人员正在寻找用于纳米颗粒合成的无毒方法。本研究涉及使用马缨丹叶提取物生物合成氧化铜纳米粒子。和夹竹桃L. 合成的氧化铜纳米粒子使用扫描电子显微镜结合 EDAX 进行表征。含有叶提取物和氧化铜纳米颗粒的制剂的功效针对木材腐烂真菌Trametes hirsuta（白腐病）和Oligoporus placenta进行了筛选（褐腐病）。同样，CuSO ₄的功效。还测试了5H ₂ O（0.5%）、CuO（0.5%）纳米颗粒和 CuO（0.5%）。结果表明，马缨丹叶提取物和 CuO 纳米颗粒的配方有效保护处理过的橡胶木免受白腐病和褐腐病的侵袭，而夹竹桃叶提取物和 CuO 纳米颗粒的配方仅保护处理过的橡胶木免受褐腐病的侵袭。由于单独的测试化学品和树叶提取物对腐烂真菌无效，因此制剂的保护作用可归因于树叶提取物的内在特性和氧化铜纳米粒子的生物杀灭特性的协同作用，从而产生有效的木材保护剂。