Using Coordination Assembly as the Microencapsulation Strategy to Promote the Efficacy and Environmental Safety of Pyraclostrobin

Abstract

The broad-spectrum and widely used fungicide pyraclostrobin is encapsulated using a coordination assembly between Fe 3+ and tannic acid to promote its efficacy and environmental safety. The deposition is confirmed by the surface zeta potential and energy dispersive spectroscopy. Optical microscopy, scanning electron microscopy, transmission electron microscopy (TEM), and atomic force microscopy (AFM) observations are integrated to characterize the pyraclostrobin-loaded microcapsules (MCs). These MCs retain a spherical shape when suspended in water but quickly deform or rupture after the water evaporates when deposited for 1 cycle. After sequential deposition of the membrane, the membrane thickness increases linearly according to TEM and AFM height analyses. These MCs show satisfactory efficacy on rice blast, resulting in significantly higher yields at doses of 120 and 180 g ha −1 . Moreover, these MCs display significantly lower toxicity to Brachydanio rerio, Daphnia magna, Xenopus laevis, and Rana nigromaculata. Overall, this novel microencapsulation strategy is capable of promoting the efficacy and environmental safety of pyraclostrobin.

Sulfonate-Functionalized Mesoporous Silica Nanoparticles as Carriers for Controlled Herbicide Diquat Dibromide Release through Electrostatic Interaction

“…However, the massive agricultural use of DQ not only increases the cost, but also results in negative impacts on the environment [5,6]. To address this limitation, the exploitation of the controlled release formulations (CRFs) of DQ could be promising, since CRFs permit the application of minimal amounts of an active ingredient to maintain the desirable activity, which will mitigate the potentially negative impacts on the environment, and promote sustainable agricultural development [7,8,9,10].…”

Easily Tunable Membrane Thickness of Microcapsules by Using a Coordination Assembly on the Liquid-Liquid Interface

“…We have previously reported that when Fe 3+ was added first, the final pyraclostrobin-loaded MCs tend to be relatively smooth, whereas MCs are prone to agglutinate when TA was first added (Li B.-X. et al, 2017 ). Therefore, we used the addition sequence of Fe 3+ + TA + Fe 3+ + TA + Fe 3+ …in the current study.…”

“…Microencapsulation technology is a promising approach that has been widely reported to protect sensitive core materials, including but not limited to chemicals and living biomaterials (Parthasarathy and Martin, 1994 ; Anderson and Shive, 2012 ; Tong et al, 2012 ; Li B.-X. et al, 2017 ). The past few decades have seen significant advances of microencapsulation in drug delivery (Wang et al, 2006 ; De Koker et al, 2012 ; Simoes et al, 2015 ; Jia et al, 2017 ; Li H. et al, 2017 ), material industry (White et al, 2001 ; Su and Schlangen, 2012 ; Jamekhorshid et al, 2014 ), biomaterials (Parthasarathy and Martin, 1994 ; Zhi and Haynie, 2006 ; Kurayama et al, 2012 ; Ekanem et al, 2017 ; Zhao et al, 2017 ), agrochemicals (Li et al, 2016 , 2018 ; Liu et al, 2016 ; Liang et al, 2017 ), food industry (Xu et al, 2013 ), and other fields.…”

A Facile Approach to Increasing the Foliage Retention of Pesticides Based on Coating with a Tannic Acid/Fe3+ Complex

“…Tannic acid (TA), a naturally occurring polyphenol, is widely distributed in various organs of plants, and exhibits good biocompatibility, high chemical reactivity, and suitable thermal stability [27,28]. TA is also readily available and shows unique biological activities and physicochemical properties, such that this compound has numerous applications in surface modified, drug delivery, and prepared other materials [29][30][31]. TA can also interact with various functional chemical groups or molecules via processes such as coordination or hydrogen bonding [32,33].…”