Properties of Avermectin Delivery System Using Surfactant-Modified Mesoporous Activated Carbon as a Carrier

Changjiao Sun,Xiang Zhao,Yue Shen,Zhanghua Zeng,Bo Cui,Fei Gao,Yan Wang,Haixin Cui

doi:10.1155/2018/3038902

Abstract

The sensitivity of avermectin to several environmental factors, especially light, causes low pesticidal activity and environmental pollution. In this study, surfactant-modified mesoporous activated carbon (MAC) was employed to absorb avermectin (Av) in order to improve its photostability and allow for sustained release of avermectin. The results suggest that sodium dodecyl sulfate (SDS) modified MAC has excellent absorption of avermectin, and the absorption can be represented by the Langmuir isotherm model. The Av-MAC-SDS delivery system significantly improves sustained release of avermectin and also effectively inhibits the photodegradation of avermectin. These results indicate that SDS-modified MAC can be used as a carrier for avermectin to improve its pesticidal activity and reduce pesticide residues.

Highlights

According to the classification of the International Union of Pure and Applied Chemistry (IUPAC), the pores of adsorbents are grouped into micropore (d < 2 nm), mesopore (d = 2–50 nm), and macropore (d > 50 nm) [15]
The average pore sizes of mesoporous activated carbon (MAC) before and after the modification were within the mesopore range of the IUPAC classification
Surfactant-modified MAC was employed as the carriers for avermectin

Summary

Introduction

Environmental pollution caused by the misuse of chemical pesticides, is becoming more and more serious [1, 2]. Biopesticides have attracted increasing attention for their high bioefficiency, safety, and other environmentally friendly traits that are consistent with the requirements of sustainable agriculture [3]. Avermectin is a class of macrocyclic lactones isolated from the soil organism Streptomyces avermitilis. It has excellent pesticidal activity in agricultural systems due to high efficiency, low toxicity, and high selectivity. Its conventional formulations still have some shortcomings, such as environmental sensitivity and short duration of effect. In order to improve the pesticidal activity of avermectin, it is preferable to adsorb avermectin onto some forms of adsorbent that can prevent degradation and avoid the loss of pesticidal activity

Methods

Results

Conclusion