Synthesis of pH‐responsive isolated soy protein/carboxymethyl chitosan microspheres for sustained pesticide release

Abstract

In order to improve the utilization rate of avermectin (AVM), a complex was prepared by electrostatic self‐assembly using isolated soy protein (ISP) and carboxymethyl chitosan (CMCS) for loading AVM to obtain ISP/CMCS@AVM microspheres. The encapsulation efficiency (EE), sustained release property, ultraviolet (UV) protective ability, and toxicity of the microspheres were evaluated, and the release kinetics of AVM from the microsphere at different pHs were investigated. The results demonstrated that the average particle size of ISP/CMCS@AVM was 283.95 nm, and the EE reached 88.42% for AVM after denaturation. After 70 h of exposure to UV light, the residual rate of AVM in ISP/CMCS@AVM was 78.12%, which was significantly higher than 35.18% in the AVM emulsion. Moreover, the formulation imparted pH sensitivity and sustained‐release property to AVM and was consistent with the Korsmeyer–Peppas model, controlled by Fick diffusion. Finally, the insecticidal toxicity of ISP/CMCS@AVM did not differ significantly from that of unmodified AVM. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48358.

Preparation of cellulose triacetate aerogel via non‐solvent impacted thermally induced phase separation for oil absorption

“…For a cylindrical sample, the adsorption follows Fick's law of diffusion at n ≤ 0.45 and an anomalous non‐Fick transport at 0.45 < n < 0.89. [ 38 ] As displayed in Table 4, the R 2 values of all CAs were larger than 0.95, suggesting that the oil absorption of CAs would obey Korsmeyer–Peppas model. Additionally, all diffusion index ( n ) were smaller than 0.45, demonstrating that the oil absorption kinetic behavior of CAs was consistent with Fick's law of diffusion.…”

Recent advances in the design of controlled- and sustained-release micro/nanocarriers of pesticide

“…Proteins (such as zein, 153 soybean protein, 154 feather keratin 155 and bovine serum albumin (BSA) 156 ) have a unique spatial structure to realize drug loading, but also have good biodegradability and biocompatibility. 27 Zein nanoparticles were prepared by an antisolvent precipitation method as an ecofriendly carrier system for packaging botanical repellents geraniol (GRL) and R-citronellal (R-CTL).…”

“…Peculiarly, biodegradable BSA is naturally oleophobic. 154 Su et al used the oil-phobic properties of BSA to encapsulate AVM in the oil phase through self-assembly to improve the bioactivity and utilization of AVM, which has a certain UV protection effect on AVM. 26 Compared with AVM@EC, AVM@BSA released steadily and accumulated 90.2% of pesticides at pH 7.0 and 25 °C without sudden release (Fig.…”

Assembly of Amino–Quinone Networks on Avermectin@mesoporous Silica with High Deposition to Leaf Surface

“…Zhou et al prepared avermectin nanocapsules (AVM@P-Zein) using hydrophilic phosphorylated zein (P-Zein) as the carrier, which could significantly improve the adhesion of avermectin on cucumber leaves. Chen et al , used carboxymethyl cellulose and carboxymethyl chitosan to chemically modify ISP through covalent bonding and electrostatic self-assembly, respectively, and prepared abamectin nanoparticles by heating to denature protein. Compared with the abamectin solution, the conjugated structure of carboxymethyl cellulose and ISP had stronger wettability on vegetable leaves.…”