Electrostatic wrapping of eupatorium-based botanical herbicide with chitosan derivatives for controlled release. (1st November 2020)

• Record Type: Journal Article
• Authors: Xie, Dong; Zhao, Qi; Zeng, Xueqi; Ma, Shufei; Zhong, Bangchao; Chen, Yongjun; Zhang, Qingzhong; Jia, Zhixin; Jia, Demin
• Is Part Of: Carbohydrate polymers. Volume 247(2020)
• Publication Date: 2020-11-01
• Subjects: Chitosan -- Botanical herbicide -- Electrostatic wrapping -- Controlled release; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2020.116700
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: Electrostatic wrapping of botanical herbicide with chitosan derivatives was realized. The release of botanical herbicide using chitosan as carrier was well controlled. The release kinetics of chitosan-carried botanical herbicide in water was investigated. The released herbicide from chitosan carrier showed fine herbicidal effect on grass. Abstract: To avoid the negative effects of chemical herbicides and prepare herbicide with long-term efficacy, the active ingredients of eupatorium adenophorum spreng (AIEAS, negatively charged) were used as a botanical herbicide, and based on electrostatic attraction, the self-assembled hydroxyl isopropyl chitosan (HPCTS, positively charged) and carboxymethyl chitosan (CMC, with good water solubility) were successfully employed as degradable and water-soluble carrier for AIEAS to realize its controlled release. The release of AIEAS from the chitosan carrier in water could be divided into two stages. In the first stage, a fast release of AIEAS was detected and the total amount of the released AIEAS reached 41.5 %, while the release rate effectively slowed down in the second stage, indicating that good balance between fast control of weeds and long-term efficacy was achieved through this controlled delivery system. The release kinetics of AIEAS during the whole release process showed good fit to the Ritger-Peppas model with Fickian diffusion as the dominant release mechanism. Moreover, it found that the released AIEAS from chitosan carrier showed fine herbicidal effect on barnyard grass.