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Preparation of natural pyrethrum-polylactic acid microspheres with different particle sizes and surface morphology
Materials Letters ( IF 3 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.matlet.2020.127345
Yan Li , Duo Cao , Feng-an Jia , Fan Chang , Rui Lv , Jia-kun Dai

Abstract Controlled-release technology has been widely studied in the field of medicine, but it is rarely used in pesticides. The objective of this study was to obtain pyrethrin-polylactic acid microspheres with different particle sizes and morphologies. By adjusting the concentration of polylactic acid and the rotation speed, a series of microspheres can be prepared simply and efficiently by using the single emulsion-solvent evaporation method. The result of laser particle size analyzer showed that the average diameter of the microspheres ranged from 13.5 to 142.4 μm. The FESEM observation revealed that the obtained microspheres were spherical with pores on the surface. And as the particle size decreases, the area of the surface pores becomes larger and shallower. The spectrum of FTIR indicated the presence of pyrethrin in the prepared microspheres.

中文翻译:

不同粒径和表面形貌的天然除虫菊-聚乳酸微球的制备

摘要 控释技术在医药领域得到了广泛研究,但在农药中应用较少。本研究的目的是获得不同粒径和形态的除虫菊酯-聚乳酸微球。通过调节聚乳酸浓度和转速,采用单一乳液-溶剂蒸发法可以简单高效地制备一系列微球。激光粒度分析仪结果表明微球的平均直径为13.5~142.4 μm。FESEM 观察表明所获得的微球为球形,表面有孔隙。并且随着粒径的减小,表面孔隙的面积变得越来越大和变浅。
更新日期:2020-04-01
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