Biosynthesis, mosquitocidal and antibacterial properties of Toddalia asiatica-synthesized silver nanoparticles: do they impact predation of guppy Poecilia reticulata against the filariasis mosquito Culex quinquefasciatus?

Abstract

Mosquito-borne diseases represent a deadly threat for millions of people worldwide. Furthermore, pathogens and parasites polluting water also constitute a severe plague for populations of developing countries. In this study, silver nanoparticles (AgN) were biosynthesized a cheap aqueous extract of T. asiatica leaves as reducing and stabilizing agent. The formation of nanoparticle was confirmed by surface Plasmon resonance band illustrated in UV-vis spectrophotometer. AgN were characterized by FTIR, SEM, EDX, and XRD analyses. AgN were mostly spherical in shape, crystalline in nature, with face-centered cubic geometry, and their mean size was 25-30 nm. T. asiatica aqueous extract and green-synthesized AgN showed excellent larvicidal and pupicidal toxicity against the filariasis vector Culex quinqufasciatus, both in laboratory and field experiments. AgN LC50 ranged from 16.48 (I instar larvae) to 31.83 ppm (pupae). T. asiatica-synthesized were also highly effective in inhibiting growth of Bacillus subtilis, Klebsiella pneumoniae, and Salmonella typhi using the agar disk diffusion and minimum inhibitory concentration protocol. Lastly, we evaluated if sublethal doses of nanoparticles affect predation rates of fishes, Poecilia reticulata, against C. quinquefasciatus. In AgN-contaminated environment, predation of guppies against mosquito larvae was slightly higher over normal laboratory conditions. Overall, this study highlighted that T. asiatica-synthesized AgN are easy to produce, stable over time, and may be employed at low dosages to reduce populations of filariasis vectors, without detrimental effects on predation rates of mosquito natural enemies.

• Authors: Kadarkarai Murugan, Joseph Selvaraj Eugine Venus, Chellasamy Panneerselvam, Stefano Bedini, Barbara Conti, Marcello Nicoletti, Santosh Kumar Sarkar, Jiang-Shiou Hwang, Jayapal Subramaniam, Pari Madhiyazhagan, Palanisamy Mahesh Kumar, Devakumar Dinesh, Udaiyan Suresh, Giovanni Benelli
• Journal: Environmental science and pollution research international (Environ Sci Pollut Res Int) Vol. 22 Issue 21 Pg. 17053-64 (Nov 2015) ISSN: 1614-7499 [Electronic] Germany
• PMID: 26122577 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Anti-Bacterial Agents
• Insecticides
• Plant Extracts
• Silver

Topics

• Animals
• Anti-Bacterial Agents (chemistry, metabolism, pharmacology)
• Culex (drug effects)
• Insecticides (chemistry, metabolism, pharmacology)
• Larva (drug effects)
• Nanoparticles (chemistry, metabolism)
• Plant Extracts (chemistry, metabolism, pharmacology)
• Poecilia
• Predatory Behavior (drug effects)
• Rutaceae (chemistry)
• Silver (chemistry, metabolism, pharmacology)