Abstract
Controlled-release formulations (CRFs) have potential applications in modern agriculture, for it can not only prolong the duration of agrochemicals but also alleviate the adverse effect on non-target organism. In this study, we constructed pyraclostrobin@SiO2@polydopamine microcapsule (Pyr@SiO2@PDA MC). The resulting microcapsule is a near-rod shape (about 1.15 μm), which has a drug-loading efficiency of 55%. Fourier transform infrared (FTIR) and thermogravimetric analysis (TG) revealed the successful entrapment of the pesticide. The coating of polydopamine (PDA) endowing the microcapsule with superior UV-shielding properties than pyraclostrobin@SiO2 microcapsule (Pyr@SiO2 MC). Compared with pyraclostrobin emulsifiable concentrate (EC), the Pyr@SiO2@PDA MC exhibited 9.07-, 5.50-, 4.93- and 4.16-fold higher fungicidal activity against Rice blast fungus (Pyricularia oryzae) at concentrations of 0.5, 1, 2 and 4 mg/L. Moreover, acute toxicity tests demonstrated that the sample on zebrafish with lower toxicity on the first day. These results showed that the obtained microcapsule may process broader application potential in agriculture.
Highlights
Pyraclostrobin (Fig. 1) is a methoxy acrylate fungicide developed by BASF in 1993 1
Fungicidal activity of Pyr@SiO2@PDA MC was assessed by the growth rate method using Fusarium oxysporum f.sp.vasinfectum as the tested strain, and the 250g/L Pyr emulsifiable concentrate (EC) was used as a control dosage form 35
The particle size of microcapsules increased with the addition of DA, but decreased when DA increased to 80mg (Table 1).This may be due to the limited specific surface area that can be contacted by the microcapsule
Summary
Pyraclostrobin (Fig. 1) is a methoxy acrylate fungicide developed by BASF in 1993 1. Acute toxicity tests demonstrated that Pyr@SiO 2 @PDA MC on zebrafish with lower toxicity on the first day. These results showed that Pyr@SiO 2 @PDA MC may process broader application potential in agriculture.
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