NDLI: Preparation and characterization of double-shelled avermectin microcapsules based on copolymer matrix of silica–glutaraldehyde

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Journal of Materials Chemistry B Vol - 1 Issue - 8

Journal of Materials Chemistry B Vol - 1 Issue - 7

Journal of Materials Chemistry B Vol - 1 Issue - 6

Journal of Materials Chemistry B Vol - 1 Issue - 5

Preparation and characterization of double-shelled avermectin microcapsules based on copolymer matrix of silica–glutaraldehyde–chitosan

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhang, Wenbing Ao, Mingming He, Shun Zhu, Yuncong Li, Deguang Cao, Yongsong Li, Pingliang Li, Jianqiang
Copyright Year	2013
Abstract	Controlled release formulation (CRF) of pesticides is highly desirable for attaining the most effective utilization of the pesticide as well as reducing environmental pollution. Due to the selective permeation and protection properties of the semi-permeable membrane, pesticide microcapsules have been widely used. In this work, we developed a novel two-step method for synthesizing highly stable silica–glutaraldehyde–chitosan composite avermectin microcapsules. The silica shell was formed through the hydrolysis and polycondensation of tetraethyl orthosilicate (TEOS) at the oil droplet–water interface by using TEOS as the silica precursor and hexadecyl trimethyl ammonium chloride as a surfactant. Then the silica shell was modified with 3-aminopropyltriethoxysilane. Chitosan nanospheres were prepared by adjusting the pH value of the solution and then cross-linking with modified silica at the surface of the silica shell in the presence of glutaraldehyde to form double-shelled avermectin microcapsules. The results showed that the resulting microcapsules had a remarkable loading ability for avermectin (about 40% w/w) and can protect avermectin against photo- and thermal degradation effectively. Compared to single-shelled microcapsules, the double-shelled ones had better controlled release properties under all conditions. The present study provides a novel CRF comprising a pesticide which is light-sensitive or high temperature-sensitive, and a method for preparing the improved pesticide formulation so that the pesticide release rate and release period could be adjusted.
Starting Page	1270
Ending Page	1278
Page Count	9
File Format	HTM / HTML PDF
ISSN	2050750X
Volume Number	1
Issue Number	9
Journal	Journal of Materials Chemistry B
DOI	10.1039/c2tb00234e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	TEOS Pesticide Semipermeable membrane Avermectin Silicon dioxide Hydrolysis Condensation polymer Tetraethyl orthosilicate Ammonium chloride Surfactant Chitosan PH Glutaraldehyde Pesticide formulation
Content Type	Text
Resource Type	Article
Subject	Chemistry Medicine Materials Science Biomedical Engineering

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