Abstract
Abamectin (Am) is an excellent biopesticide for insect pests control but environmental sensitivity and a short duration in conventional formulations limit its application in agriculture. In order to promote the dispersity, stability, and biological activity of Am, well-monodisperse nanochitin (NCh) and Am-loaded nanoparticles (NCh-Am) were prepared and examined in this study. NCh was prepared by ultrasonication combining with low concentration acidic hydrolysis and NCh-Am nanoparticles were combined by conjugation in dispersion naturally. The effective particle size of NCh was 110.6 ± 18.6 nm with cationic nature, while those of NCh-Am conjugates ranged from 160 to 700 nm based on the mixing ratio. The binding efficiency of Am to NCh in the conjugates reached 53.7 ± 7.6% in DI water at pH 6.2. The thermal stability and water solubility of Am were greatly promoted by NCh. The photodegradation of Am in the conjugates decreased 48% when exposed to UV light for 56 h. The conjugate containing half of Am showed significant control efficiency in larva growth and enhanced mortality against 2 instar larvae of noctuid. The results suggested that NCh significantly promoted Am water dispersity, thermal stability, and photostability, and effectively reduced pesticides dosage in insect pest control. This finding indicates that NCh-Am can be used as a new bioactive delivery system in future pest management.
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