Biosynthesis of silver nano composite using agro waste and its larvicidal properties

摘要

Mosquito has attracted considerable attention in the medical and social regions of the world. They are the vectors of many diseases accounting for huge mortality and morbidity worldwide. In the present experiment we prepared a silver nano composite using paddy straw and tested its potential larvicidal activities against Aedes aegypti and Anopheles gambiae larvae at 25, 50, 100 ppm concentration. The synthesised nanoparticles using paddy straws were characterised by Ultra Violent resonance, Fourier transform infrared spectroscopy, Scanning Electron Microscopy and Energy-dispersive X-ray spectroscopy analysis. In larvicidal assay, the fourth instar larvae are exposed to different concentrations of silver nano composite aqueous extract for 24 hours. From the experiment it is revealed that the mean concentration to kill 50% of larval population is found to be 13.625 ppm for Aedes aegypti and 12.270 ppm for Anopheles gambiae .