Preparation of methyl isonicotinate/α-cyclodextrin microcapsules and their attractant effect on thrips
To develop an environmentally friendly and controllable release formulation of thrips phero-mone,methyl isoniotinate/α-cyclodextrin microcapsules were prepared using a saturated solution stir-ring method.The optimal embedding conditions were determined through an L9(34)orthogonal experi-ment.The microcapsules structures were analyzed using infrared spectroscopy,X-ray diffraction,and scanning electron microscopy.The release kinetics of the microcapsules were investigated,and their at-tractant effect on thrips was evaluated in the greenhouses.The results showed that the optimal embed-ding conditions for the microcapsules were as follows:a reaction temperature of 40 ℃,a stirring rate of 800 r/min,a core-to-wall mass ratio of 0.3∶1.0,and a reaction time of three hours.Under these condi-tions,the encapsulation efficiency reached 53.16％.The microcapsules exhibited a spherical morpholo-gy with even dispersion.The release kinetics of the microcapsules followed the Korsmeyer-Peppas mod-el,with the release mechanism being controlled by Fickian diffusion.The field attraction results showed that the average number of Thrips palmi attracted by the microcapsules was 2.58 times higher than the control and 1.96 times higher than methyl nicotinate,reaching 475.5 thrips per trap.This demonstrated that the microcapsules had good sustained-release performance,duration,and attractant effect.These re-sults indicated that the microencapsulation of thrips attractants can improve their stability and durability and can be used in the development of insect pheromone sustained-release carrier products.
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维普
