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A new series of substituted benzo[h]chromene, benzochromenopyrimidine, and benzochromenotriazolopyrimidine derivatives were synthesized via chemical transformations of iminonitrile, ethoxymethylene amino, and cyanomethylene functionalities. The chemical structures of the synthesized compounds were assured by spectroscopic data and elemental analysis. The larvicidal efficacy of these compounds against Culex pipiens L. larvae was investigated, revealing potent insecticidal activity, particularly for compounds 6, 10, and 16, exceeding that of the standard insecticide chlorpyrifos. The mode of action of these compounds was explored through molecular docking studies, indicating their potential as acetylcholine esterase (AChE) inhibitors and nicotinic acetylcholine receptors (nAChR) blockers. The structure-activity relationship analysis highlighted the influence of substituents and fused heterocyclic rings on larvicidal potency. These findings suggest that the synthesized compounds hold promise as potential candidates for developing novel and effective mosquito control agents.
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http://dx.doi.org/10.1038/s41598-024-68035-0 | DOI Listing |
ACS Omega
September 2025
Department of Horticultural Science, Texas A&M University, College Station, Texas 77843, United States.
The limited water solubility and environmental instability of natural pesticidal compounds impede their broader agricultural use. This study reports an amphiphile-assisted nanoprecipitation method to imbibe azadirachtin-rich neem seed extract (NSE) within a glycine carrier matrix, yielding a stable nanocomposite biopesticide. The formulation, prepared using polyoxyethylene sorbitan monooleate as a stabilizer and glycine as the matrix former, followed by lyophilization, exhibited a hydrodynamic diameter of ∼8 nm when redispersed in water.
View Article and Find Full Text PDFNeotrop Entomol
September 2025
Department of Zoology, College of Science, King Saud University, PO Box 2455, 11451, Riyadh, Saudi Arabia.
This study evaluated the larvicidal efficacy of the methanol extract of Dactyloctenium aegyptium against Aedes aegypti (L, 1762) (Diptera: Culicidae), Anopheles stephensi Liston, 1901 (Diptera: Culicidae), and Culex quinquefasciatus Say, 1823 (Diptera: Culicidae). The methanol extract exhibited the highest mortality rates, achieving 100% mortality at 250 µg/mL for all species tested, and demonstrated the lowest LC values of 94.28 µg/mL for Ae.
View Article and Find Full Text PDFActa Trop
August 2025
MIVEGEC, Université Montpellier, IRD, CNRS, Montpellier, France. Electronic address:
The Asian tiger mosquito, Aedes albopictus, is a significant public health threat due to its ability to spread diseases such as dengue and chikungunya. Traditional insecticide-based control methods are increasingly ineffective due to mosquito resistance and environmental concerns. This has driven interest in alternative strategies like mass trapping, although its effectiveness in reducing Ae.
View Article and Find Full Text PDFInt J Mol Sci
August 2025
Department of Biology, College of Science, Jazan University, Jazan 45142, Saudi Arabia.
Mosquitoes pose a significant problem worldwide because of the diseases they transmit. Due to its antimicrobial and disinfectant properties, () has long been a popular choice in traditional medicine. This study aimed to extract using three different solvents-methanol, acetone, and chloroform-to identify their biochemical components and assess their larvicidal activity.
View Article and Find Full Text PDFJ Fungi (Basel)
August 2025
Crop BioProtection Research Unit, USDA-ARS, National Center for Agricultural Utilization Research, 1815 N. University St., Peoria, IL 61604, USA.
The increasing global burden of mosquito-borne diseases and the widespread development of insecticide resistance in mosquitoes have fueled renewed interest in entomopathogenic fungi as effective tools that are compatible with existing mosquito control strategies. These fungi produce different types of infective propagules, including hydrophobic conidia and yeast-like blastospores, which differ in structure, mode of infection, and virulence. In this study, we evaluated the larvicidal activity of conidial and blastospore propagules from MBC076 and MBC397 against .
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