Glutathione-Responsive Carboxymethyl Chitosan Nanoparticles for Controlled Release of HerbicidesReportar como inadecuado




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Glutathione-responsive carboxymethyl chitosan nanoparticles cross-linked with disulfide bondswere developed for controlled release of herbicides. The nanoparticles were synthesized by selfassemblyof amphiphilic carboxymethyl chitosan derivative CMCS-MUA in aqueous solution andsubsequently producing disulfide cross-linking bonds by ultrasonic treatment. TEM showed thatthe nanoparticles had a spherical core-shell configuration with a size of about 250 nm. Assessmentof stability of the nanoparticles considering mean diameter, polydispersity, and Zeta potentialwas conducted over a period of three months, and the nanoparticles were found to be stable insolution. Herbicide-loaded nanoparticles were prepared using diuron as a model herbicide. In vitrorelease study revealed that diuron can be released from nanoparticles in a controlled mannerdepended on the glutathione concentration. Herbicidal activity assays performed with preemergencetreatment of target species Echinochloa crusgalli showed the effectiveness of diuron-loaded nanoparticles. Assays with nontarget species Zea mays showed that the diuronloadednanoparticles did not affect plant growth. The results indicate that the glutathioneresponsivenanoparticles prepared in this work will be a promising candidate for controlled releaseof herbicides in agriculture.

KEYWORDS

Glutathione-Responsive, Nanoparticles, Controlled Release, Herbicides, Diuron

Cite this paper

Yu, Z. , Sun, X. , Song, H. , Wang, W. , Ye, Z. , Shi, L. and Ding, K. 2015 Glutathione-Responsive Carboxymethyl Chitosan Nanoparticles for Controlled Release of Herbicides. Materials Sciences and Applications, 6, 591-604. doi: 10.4236-msa.2015.66062.





Autor: Zhiyan Yu*, Xin Sun, Haixia Song, Wenqian Wang, Zhao Ye, Liyan Shi, Kaikai Ding

Fuente: http://www.scirp.org/



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