Enhanced Insecticidal Effect and Interface Behavior of Nicotine Hydrochloride Solution by a Vesicle Surfactant

Abstract

Nicotine hydrochloride (NCT) has a good control effect on hemiptera pests, but its poor interfacial behavior on the hydrophobic leaf leads to few practical applications. In this study, a vesicle solution by the eco-friendly surfactant, sodium diisooctyl succinate sulfonate (AOT), was prepared as the pesticide carrier for NCT. The physical chemical properties of NCT-loaded AOT vesicles (NCT/AOT) were investigated by techniques such as dynamic light scattering (DLS), small-angle X-ray scattering (SAXS), and cryogenic transmission electron microscopy (cryo-TEM). The results showed that the pesticide loading and encapsulation efficiency of NCT/AOT were 10.6% and 94.8%, respectively. The size of NCT/AOT vesicle was about 177 nm. SAXS and surface tension results indicated that the structure of the NCT/AOT vesicle still existed with low surface tension even after being diluted 200 times. The contact angle of NCT/AOT was always below 30°, which means it could wet the surface of the cabbage leaf well. Consequently, NCT/AOT vesicles could effectively reduce the bounce of pesticide droplets. In vitro release experiments showed that NCT/AOT vesicles had sustained release properties; 60% of NCT in NCT/AOT released after 24 h, and 80% after 48 h. Insecticidal activity assays against aphids revealed that AOT vesicles exhibited insecticidal activity and could have a synergistic insecticidal effect with NCT after the loading of NCT. Thus, the NCT/AOT vesicles significantly improved the insecticidal efficiency of NCT, which has potential application in agricultural production activities.

Vesicles as a Multifunctional Microenvironment for Electrochemiluminescence Signal Amplification

“…27,28 Moreover, the contact angle of a water droplet on the AOT vesicle-modified gold electrode (34.9°) was much lower than that on the bare gold electrode (72.5°), which indicated that the modified vesicle layer made the electrode more hydrophilic (Figure S2). 31 Therefore, the AOT vesicles could be easily assembled on the surface of the gold electrode to obtain an AOT vesicle-modified microenvironment. Vesicle-Modified Microenvironment-Amplified Luminol ECL.…”

“…Subsequently, a gold electrode was immersed in the AOT vesicle solution for 10 min to obtain the AOT vesicle-modified gold electrode. Quartz crystal microbalance with dissipation monitoring (QCM-D) and contact angle measurements were used to investigate the self-assembly behavior of AOT vesicles on the surface of the gold electrode. ,, QCM-D measurement can study the adsorption of modifiers on the electrode using the piezoelectric properties of gold-plated quartz crystals. The basic resonant frequency F 0 is 5 MHz, and the adsorption of surfactants leads to a decrease in the frequency F .…”

“…The decreased value of F indicated that AOT vesicles were adsorbed on the surface of the gold electrode, while the increased value of D suggested that AOT vesicles were able to maintain the vesicle structure. , Moreover, the contact angle of a water droplet on the AOT vesicle-modified gold electrode (34.9°) was much lower than that on the bare gold electrode (72.5°), which indicated that the modified vesicle layer made the electrode more hydrophilic (Figure S2). Therefore, the AOT vesicles could be easily assembled on the surface of the gold electrode to obtain an AOT vesicle-modified microenvironment.…”

“…Quartz crystal microbalance with dissipation monitoring (QCM-D) and contact angle measurements were used to investigate the self-assembly behavior of AOT vesicles on the surface of the gold electrode. 27,28,31 QCM-D measurement can study the adsorption of modifiers on the electrode using the piezoelectric properties of gold-plated quartz crystals. The basic resonant frequency F 0 is 5 MHz, and the adsorption of surfactants leads to a decrease in the frequency F. Dissipation (D) represents the energy lost by an oscillating system within one oscillation cycle, where the higher dissipation is caused by the adsorption of a flexible aggregate consisting of a soft layer (e.g., vesicle).…”

Discovery of Rhodanine Inhibitors Targeting Of ChtI Based on the π-Stacking Effect and Aqueous Solubility

“…nisms of Target Compounds IIAa−f and IIBa−f. In the process of insecticide application, surfactant, 35 structural modification, 36 and water-based nanocarrier agents 37 have aided drug design in the promotion of pesticide aqueous solubility, resulting in the enhancement of insecticidal efficiency. Hence, the promotion of compound aqueous solubility on the basis of a structural modification strategy is worth conducting in this work.…”