Mosquito larvicidal activity of silver nanoparticles synthesized using Azolla pinnata against Culex quinquefasciatus Say (Diptera: Culicidae)

•Silver nanoparticles (Ag NPs) were biologically synthesised using the seaweed Azolla pinnata.•Azolla pinnata synthesized silver nanoparticles were characterized by UV–Vis spectrophotometry, SEM, EDX, FTIR, and XRD analysis and results supported the confirmation of Ag NPs.•Larvicidal activity of Azo...

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Bibliographic Details
Published in:South African journal of botany 2023-06, Vol.157, p.380-386
Main Authors: Wilson, J John, Mahendran, Shunmugiah, Sivakumar, T, Ponmanickam, P, Thangaraj, R
Format: Article
Language:English
Subjects:
Azolla pinnata
Larvicidal activity
SEM
Silver nanoparticles
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Summary:•Silver nanoparticles (Ag NPs) were biologically synthesised using the seaweed Azolla pinnata.•Azolla pinnata synthesized silver nanoparticles were characterized by UV–Vis spectrophotometry, SEM, EDX, FTIR, and XRD analysis and results supported the confirmation of Ag NPs.•Larvicidal activity of Azolla pinnata Ag NPs was evaluated against the fourth instar larvae Culex quinquefasciatus and exhibit high bioactivity on mosquito larvae.•Green synthesized Ag NPs shows less toxic to non-target organisms. Vector control is a significant component of interventions to control mosquito-borne diseases. In the present study, silver nanoparticles (Ag NPs) were synthesised using the seaweed Azolla pinnata to evaluate larvicidal activity against Culex quinquefasciatus. The biosynthesis of Ag NPs using Azolla pinnata extract was confirmed by the visible change in colour of the reaction mixture from light green to brown. UV–Vis spectra analysis showed that absorbence peaks at around 254 nm due to the surface Plasmon resonance of the silver nanoparticles. The analytical studies of SEM, EDX, FTIR, and XRD analysis results supported the confirmation of Ag NPs. Synthesized Ag NPs were assessed for the mortality rate of Culex quinquefasciatus. Based on LC50 and LC90 analysis, 4.287μl/ml of Ag NP is required to kill 50% of the larvae, whereas 10.795μl/ml is necessary to kill 90% of the larvae. Moreover, the synthesised Ag NPs exhibit high bioactivity on mosquito larvae and can thus be utilised as a biological control agent to control mosquito populations.
ISSN:0254-6299
1727-9321
DOI:10.1016/j.sajb.2023.04.019