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PLoS One

Title:		"Preparation, characterisation, and controlled release of sex pheromone-loaded MPEG-PCL diblock copolymer micelles for Spodoptera litura (Lepidoptera: Noctuidae)"
Author(s):		Chen Y; Chen X; Chen Y; Wei H; Lin S; Tian H; Lin T; Zhao J; Gu X;
Address:		"Institute of Plant Protection, Fujian Academy of Agricultural Sciences, Fuzhou, Fujian, China. Fujian Key Laboratory for Monitoring and Integrated Management of Crop Pests, Fuzhou, Fujian, China. Fuzhou Scientific Observing and Experimental Station of Crop Pests, Ministry of Agriculture, Fuzhou, Fujian, China. Key Laboratory of Green Control of Insect Pests, Fujian Agriculture and Forestry University, Fuzhou, Fujian, China. College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, Fujian, China"
Journal Title:		PLoS One
Year:		2018
Volume:		20180907
Issue:		9
Page Number:		e0203062 -
DOI:		10.1371/journal.pone.0203062
ISSN/ISBN:		1932-6203 (Electronic) 1932-6203 (Linking)
Abstract:		"Sex pheromones are important for agricultural pest control. The main sex pheromone components of Spodoptera litura are (Z,E)-9,11- and (Z,E)-9,12-tetradecadienyl acetate (Z9,E11-14:Ac; Z9,E12-14:Ac). In this study, we investigated the optimal conditions for encapsulation of S. litura sex pheromonesin micelles via the self-assembly method using monomethoxy poly (ethylene glycol)-poly (epsilon-caprolactone) (MPEG-PCL) as a biodegradable wall-forming material with low toxicity. In the L9(3(4) orthogonal experiment, 3 amphiphilic block copolymers, with different hydrophilicity to hydrophobicity ratios, were examined. Optimal encapsulation conditions included stirring of MPEG5000-PCL2000 at 1000 rpm at 30 degrees C with 2.5:1 wall-forming: core material mass ratio. S. litura sex pheromone-loaded MPEG5000-PCL2000 micelles presented a homogeneous spherical morphology with apparent core-shell structure. The release kinetics of optimized MPEG5000-PCL2000 micelles was best explained by a first-order model. Encapsulated Z9,E11-14:Ac and Z9,E12-14:Ac were released slowly, not suddenly. Methyl oleate (MO) was used as an agent to control micellar release performance. When MO content equalled block content, micelle half-life could be prolonged, thereby controlling the release speed. Overall, our results showed MPEG-PCL as a promising controlled-release substrate for sex pheromones"
Keywords:		Animals Delayed-Action Preparations Insect Control/*methods Kinetics Micelles Polyesters/chemistry Polyethylene Glycols/chemistry *Sex Attractants *Spodoptera;
Notes:		"MedlineChen, Yixin Chen, Xiuqin Chen, Yong Wei, Hui Lin, Shuo Tian, Houjun Lin, Tao Zhao, Jianwei Gu, Xiaojun eng Research Support, Non-U.S. Gov't 2018/09/08 PLoS One. 2018 Sep 7; 13(9):e0203062. doi: 10.1371/journal.pone.0203062. eCollection 2018"