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10 results on '"Zhang, Daxia"'

3. A novel approach to managing facility airborne diseases: suppressing air pathogens with smoke aerosols generated from fungicide phase transition.

Author

Gao, Haojie, Liu, Fengqi, Han, Chong, Liu, Xiaochi, Zhou, Li, Zhang, Jingzhi, Wang, Ranran, Zou, Nan, Zhang, Daxia, Mu, Wei, Zhang, Yaozhong, and Liu, Feng

Subjects
PHASE transitions, CHEMICAL industry, PESTICIDES, FUNGICIDES, AEROSOLS
Abstract

BACKGROUND: Environmental microorganisms are major contributors to the development and spread of disease. Chemical disinfection can inhibit pathogens and play a preventive role against diseases. In agriculture, prolonging the floating time of chemical pesticides in the air has a positive effect on the control of airborne diseases. However, the interaction of chemical pesticides with airborne pathogens is not yet known. RESULTS: Here, triazole fungicide was transformed into stable smoke aerosols in order to assess the feasibility of employing phase transition release pesticides for air disinfection. The phase transition had a minimal impact on hexaconazole (Hexa) and myclobutanil (Mycl), with their smoke formation rates remaining consistently >90%. In microscopic morphology, triadimenol (Tria) and epoxiconazole (Epox) are solid, and tebuconazole (Tebu), Hexa, Mycl and difenoconazole (Dife) are liquid. Liquid smoke has advantages over solid smoke in the inhibition of environmental pathogens. The floatability and spatial distribution of fungicide aerosol were optimized by the combination of smoke particles with different properties, so that the fungicide aerosol could meet the conditions of practical application. In practical applications, smoke exhibits a gentler deposition process at the target interface compared to spray, along with a more homogeneous distribution of fungicides. Moreover, fungicide smoke demonstrates superior control efficacy and leaves behind lower residual amounts on fruit. CONCLUSION: In conclusion, the implementation of fungicide phase transition as a smoke aerosol offers a viable approach to effectively suppress pathogen aerosols and enhance the control of airborne diseases. © 2024 Society of Chemical Industry. [ABSTRACT FROM AUTHOR]

Published
2024
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10. Emamectin benzoate nanogel suspension constructed from poly(vinyl alcohol)-valine derivatives and lignosulfonate enhanced insecticidal efficacy

Author

Beixing Li, Youming Hou, Feng Liu, Wei Mu, Zhang Daxia, Tong-fang Jing, Rui Wang, Haichao Cao, and Jian Luo

Subjects
Insecticides, Vinyl alcohol, Nanogels, Lignin, Polyethylene Glycols, Suspension (chemistry), chemistry.chemical_compound, Colloid and Surface Chemistry, Valine, Polyethyleneimine, Physical and Theoretical Chemistry, Laccase, chemistry.chemical_classification, Ivermectin, biology, Chemistry, Surfaces and Interfaces, General Medicine, Polymer, Pesticide, Polyvinyl Alcohol, Digestive enzyme, biology.protein, Biotechnology, Nuclear chemistry, Nanogel
Abstract

To reduce the negative impact of nanopesticide carriers of on the environment, a greener nanodelivery system is necessary. Nanogels are nontoxic and degradable carriers, however, the potential of nanogels for delivering pesticides has not been proven. In this study, poly(vinyl alcohol)-valine, an ecofriendly polymer, was synthesized and used to fabricate emamectin benzoate nanogel suspension (EB NS). The nanoformulation showed favorable stability at low temperature, high temperature or one year storage, and in water with different hardnesses. The retention of the EB NS solution on leaves was higher than that of an EB emulsifiable concentrate (EC) by approximately 9% at a concentration of 10 mg L−1. The half-life of EB nanogels under Ultra Violet irradiation was prolonged by 3.3-fold. Moreover, the bioactivity of the EB NS against Plutella xylostella was higher than that of the EB EC. These advantages resulted in a relatively long duration of pest control. The response of nanogels to laccase, a digestive enzyme in the digestive tract of lepidopteran pests, enables pesticide release on demand. Nanogels have the advantages of being ecofriendly carriers, exhibiting higher utilization, and prolonged pest control periods, and they have a brilliant future in pesticide delivery.

Published
2022

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