Preparation of natural pyrethrum-polylactic acid microspheres with different particle sizes and surface morphology

•A series of pyrethrum-PLA microspheres with different morphology were prepared.•While the sizes change, the appearances of microspheres change regularly.•100-800 mg of microspheres can be obtained per 100 mL of the reaction system. Controlled-release technology has been widely studied in the field...

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Bibliographic Details
Published in:Materials letters 2020-04, Vol.264 (C), p.127345, Article 127345
Main Authors: Li, Yan, Cao, Duo, Jia, Feng-an, Chang, Fan, Lv, Rui, Dai, Jia-kun
Format: Article
Language:English
Subjects:
Biodegradable materials
FTIR
Materials science
Microspheres
Microspheres of PLA
Morphology
Natural pyrethrum
Particle size
Pesticides
Polylactic acid
Powder technology
Solvent evaporation
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Summary:•A series of pyrethrum-PLA microspheres with different morphology were prepared.•While the sizes change, the appearances of microspheres change regularly.•100-800 mg of microspheres can be obtained per 100 mL of the reaction system. 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.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2020.127345