title: Synthesis of AzPhchitosan-bifenthrin-PVC to protect cables against termites.
abstract: The destruction of PVC cables by termites is a continuing and long-standing problem, which can lead to power leakage and power cut. Given the environmental demerits of insecticide overuse, alternative methods of addressing this problem are a highly desirable goal. In this study, we used photo-immobilization to develop a chitosan carrier system to help bifenthrin immobilize on the surface of the PVC substrate. The immobilization was analyzed using nuclear magnetic resonance (NMR), UV absorption, reverse-phase high-performance liquid chromatography (RP-HPLC), Raman absorption spectroscopy, and thermal gravimetric analysis (TGA). The surface structure and biological activity of the embedded and immobilized bifenthrin were examined using scanning electron microscopy (SEM), atomic force microscopy (AFM), and X-ray photon-electron spectroscopy (XPS). Its efficacy was assessed in pest experiments. The results indicate a successful embedding and immobilization of bifenthrin. Furthermore, the chemical bonding network between AzPhchitosan, bifenthrin, and PVC is stable, guaranteeing no environmental release of bifenthrin, and also providing more efficacious protection against termites. The evidence suggests that this photo-immobilization of bifenthrin-embedded chitosan on the surface of PVC substrates is a novel and environmentally friendly technique for termite control. This paper also reports a modification of chitosan with respect to its novel application in environmental protection.
authors.affiliation: MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou 510631, China; School of Life Science, South China Normal University, Guangzhou 510631, China.
authors.forename: Lingkun
authors.initials: L
authors.lastname: Zhang
authors.affiliation: School of Life Science, South China Normal University, Guangzhou 510631, China.
authors.forename: Weiwei
authors.initials: W
authors.lastname: Cai
authors.affiliation: School of Life Science, South China Normal University, Guangzhou 510631, China.
authors.forename: Wu-Ya
authors.initials: WY
authors.lastname: Chen
authors.affiliation: School of Life Science, South China Normal University, Guangzhou 510631, China.
authors.forename: Li
authors.initials: L
authors.lastname: Zhang
authors.affiliation: MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou 510631, China.
authors.forename: Kaikai
authors.initials: K
authors.lastname: Hu
authors.affiliation: MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou 510631, China; School of Life Science, South China Normal University, Guangzhou 510631, China. Electronic address: guanyq@scnu.edu.cn.
authors.forename: Yan-Qing
authors.initials: YQ
authors.lastname: Guan
mesh_terms: D000818:Animals; D001386:Azides / Q000737:chemistry*; D048271:Chitosan / Q000737:chemistry*; D003432:Cross-Linking Reagents / Q000737:chemistry*; D055615:Electrical Equipment and Supplies; D007300:Insect Control / Q000379:methods; D007306:Insecticides / Q000737:chemistry*; D020049:Isoptera; D055668:Photochemical Processes; D011143:Polyvinyl Chloride / Q000737:chemistry*; D011722:Pyrethrins / Q000737:chemistry*; D014466:Ultraviolet Rays
chemical_list: D001386:Azides; D003432:Cross-Linking Reagents; D007306:Insecticides; D011722:Pyrethrins; C029534:hydroxysuccinimidyl-4-azidobenzoate; C099952:bifenthrin; D011143:Polyvinyl Chloride; D048271:Chitosan
keywords: Chitosan; Immobilization; PVC cable; Termite control