Green-synthesized silver nanoparticles using Psychotria nilgiriensis: toxicity against the dengue vector Aedes aegypti (Diptera: Culicidae) and impact on the predatory efficiency of the non-target organism Poecilia sphenops (Cyprinodontiformes: Poeciliidae)
| Autor: | Devakumar Dinesh, Periasamy Vijayan, Dhandapani Abirami, Kalimuthu Kovendan, Marimuthu Govindarajan, Savariar Vincent, Balamurugan Chandramohan, Giovanni Benelli |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Veterinary medicine animal structures XRD Ovicidal activity Population Aedes aegypti UV–vis spectrophotometry Predation 03 medical and health sciences Sphenops parasitic diseases Botany Adulticidal activity Biosafety UV–vis spectrophotometry XRD SEM non-target aquatic organisms Insect Science education Poeciliidae non-target aquatic organisms education.field_of_study Larva biology fungi 030108 mycology & parasitology biology.organism_classification Pupa SEM Poecilia sphenops |
| Zdroj: | Journal of Asia-Pacific Entomology. 19:1001-1007 |
| ISSN: | 1226-8615 |
| DOI: | 10.1016/j.aspen.2016.09.001 |
| Popis: | Mosquitoes transmit serious diseases to humans and animals, causing millions of deaths every year. Effective insecticides of natural origin for eco-friendly vector control are a priority. In this study, silver nanoparticles (AgNPs) biosynthesized using as cheap Psychotria nilgiriensis leaf extract were tested on larvae and pupae of Aedes aegypti (Diptera: Culicidae). Biophysical characterization was carried out with UV–vis spectrophotometry, Fourier transform infrared spectroscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. Larvae were exposed to varying concentrations of aqueous extract of synthesized AgNPs for 24 h. The maximum mortality was observed for green-synthesized AgNPs. Moreover, the combined treatment of leaf extract of P. nilgiriensis and AgNPs lowered the plant extract LC50 to 92.87, 115.27, 140.37, 169.30 and 212.55 μg/ml. The effectiveness of green synthesized AgNPs was confirmed against eggs and adults of A. aegypti. Furthermore, we showed that the predatory efficiency of Poecilia sphenops on A. aegypti was not reduced after the exposure at sublethal doses of AgNPs. Predation in the control was 65% (larva I) and 49.62% (larva II). Predation against late-instar larvae was minimal. In AgNPs-treated environment (3 ppm), predation was boosted to 90.25% (larva I) and 76.50% (larva II), respectively. Overall, P. nilgiriensis-synthesized AgNPs could be proposed at ultra-low doses to reduce larval population of dengue vectors enhancing predation rates of P. sphenops. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect