Adhesive polydopamine coated avermectin microcapsules for prolonging foliar pesticide retention.
In this work, we report a conceptual strategy for prolonging foliar pesticide retention by using an adhesive polydopamine (PDA) microcapsule to encapsulate avermectin, thereby minimizing its volatilization and improving its residence time on crop surfaces. Polydopamine coated avermectin (Av@PDA) microcapsules were prepared by emulsion interfacial-polymerization and characterized by Fourier transform infrared spectroscopy, energy dispersive X-ray spectroscopy, field-emission scanning electron microscope, and transmission electron microscopy. The in situ synthesis route confers Av@PDA microcapsules with remarkable avermectin loading ability of up to 66.5% (w/w). Kinetic study of avermectin release demonstrated that Av@PDA microcapsules exhibit sustained- and controlled-release properties. The adhesive property of Av@PDA microcapsules on different surfaces was verified by a comparative study between Av@PDA and passivated Av@SiO2 and Av@PDA@SiO2 capsules with silica shell. Moreover, PDA shell could effectively shield UV irradiation and so protect avermectin from photodegradation, making it more applicable for foliar spraying. Meanwhile, it is determinated that Av@PDA microcapsules have good mechanical stability property.
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences , Lanzhou 730000, People's Republic of China.
Xin
X
Jia
Wen-bo
WB
Sheng
Wei
W
Li
Yan-bin
YB
Tong
Zhi-yong
ZY
Liu
Feng
F
Zhou
D000269:Adhesives / Q000737:chemistry; D002214:Capsules / Q000737:chemistry; D018556:Crops, Agricultural; D007211:Indoles / Q000737:chemistry*; D007559:Ivermectin / Q000031:analogs & derivatives* / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D010575:Pesticides / Q000737:chemistry* / Q000494:pharmacology; D058105:Polymerization; D011108:Polymers / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared
D000269:Adhesives; D002214:Capsules; D007211:Indoles; D010575:Pesticides; D011108:Polymers; C568283:polydopamine; D007559:Ivermectin; C019264:avermectin
adhesion; avermectin; emulsion interfacial polymerization; polydopamine