Mosquito-Larvicidal Potential of Metal and Oxide nanoparticles Synthesized from Aqueous Extract of the Seagrass, Cymodocea serrulata
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Mosquitoes are considered to be the deadliest arthropod-vectors, which causes millions of human deaths globally. Presently, the synthesis of Ag, Pd and TiO2-nanoparticles (NPs) from the aqueous extracts of Cymodocea serrulata and evaluation of their larvicidal property against 3 different mosquitoes; A. aegypti, C. quinquefasciatus and A. stephensi were performed. The synthesized NPs were characterized by UV–Vis, XRD, FTIR, FE-SEM and Zeta potential analyses. The mosquito-larvicidal efficacy of CS-AgNPs against A. stephensi showed maximum lethal effects with the LC50 and LC90 values (µg/mL) of: 2.099 and 36.432 respectively, for 1st instar. CS-PdNPs have shown larvicidal effect against A. stephensi with the LC50 and LC90 values (µg/mL) of: 4.010 and 80.827 respectively, for 1st instar. Whereas, for the CS-TiO2NPs the LC50 and LC90 values against A. stephensi were: 5.052 and 141.428 respectively, for 1st instar. The histological analysis of the CS-AgNPs treated mosquito larvae revealed vacuolation in their adipose, epithelium and muscle tissues. The CS-AgNPs exerted minimal toxic effects to the non-targeted organisms (Artemia salina and Oithona dissimilis) with 20.22 and 21.66% mortality respectively, after 48 h. Overall, it is concluded that the C. serrulata synthesized silver nanoparticles could form potential mosquito larvicidal agent.
KeywordsAedes aegypti Anopheles stephensi Culex quinquefasciatus Cymodocea serrulata Nanoparticles
We thank the authorities of Periyar University, India for providing the infrastructural facility for carrying out this research work. The supply of mosquito larvae by the ICMR-Vector Control Laboratory, Madurai, is gratefully acknowledged with thanks. The authors are thankful to the Department of Nanoscience & Technology, Bharathiar University, Coimbatore for their XRD, FE-SEM and EDX analyses of the samples.
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