期刊
CARBOHYDRATE POLYMERS
卷 243, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2020.116433
关键词
Carboxymethyl chitosan; Trisiloxane surfactant; Avermectin; Sustained release; pH sensitivity
资金
- National Natural Science Foundation of China [21576303]
- Natural Science Foundation of Guangdong Province [2017A030311003]
- Science Technology Program of Guangzhou, China [201903010011]
- Innovation Team of Modern Agricultural Industry Technology System of Guangdong Province [2019KJ140]
- Innovation Team Project by the Department of Education of Guangdong Province [2018KCXTD015]
- College Students Innovation and Entrepreneurship Training Program [2019A07]
A trisiloxane surfactant (TSS) was grafted onto an intermediate, formed by the reaction of allyl glycidyl ether (AGE) with carboxymethyl chitosan (CMCS), to obtain amphiphilic CMCS-AGE-TSS. Avermectin (AVM) was used as a model pesticide and CMCS-AGE-TSS@AVM nanoparticles were prepared by self-assembly. The structures and morphologies of the nanoparticles were studied by FT-IR and H-1 NMR spectroscopy, XRD, SEM, TGA, DSC, and DLS techniques. The average particle size of CMCS-AGE-TSS@AVM was 210 nm, with encapsulation efficiency of 66 %. With increase in TSS content, the contact angle on the leaf surface decreased from 73.62 degrees for CMCS to 49.32 degrees for CMCS-AGE-TSS. The half-life of AVM encapsulated in the polymer shell increased from 45 min to 83 min. Moreover, sustained release of the drug showed a significant response to pH. Finally, the difference in toxicities between CMCS-AGE-TSS@AVM and pure AVM was not significant.
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