title: Biosynthesis of silver nanoparticles using Bacillus thuringiensis against dengue vector, Aedes aegypti (Diptera: Culicidae).
abstract: The present study reveals the larvicidal activity of silver nanoparticles (AgNPs) synthesized by Bacillus thuringiensis (Bt) against Aedes aegypti responsible for the diseases of public health importance. The Bt-AgNPs were characterized by using UV-visible spectrophotometer followed by scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX) spectroscopy. A surface plasmon resonance spectrum of AgNps was obtained at 420 nm. The particle sizes were measured through SEM imaging ranging from 43.52 to 142.97 nm. The Bt-AgNPs has also given a characteristic peak at 3 keV in EDX image. Interestingly, the mortality rendered by Bt-AgNPs was comparatively high than that of the control against third-instar larvae of A. aegypti (LC50 0.10 ppm and LC90 0.39 ppm) in all the tested concentrations, viz. 0.03, 0.06, 0.09, 0.12, and 0.15 ppm. Hence, Bt-AgNPs would be significantly used as a potent mosquito larvicide against A. aegypti.
authors.affiliation: Postgraduate and Research Department of Zoology, Thiagarajar College, Madurai, 625009, Tamil Nadu, India, najirila2010@gmail.com.
authors.forename: A Najitha
authors.initials: AN
authors.lastname: Banu
authors.forename: C
authors.initials: C
authors.lastname: Balasubramanian
authors.forename: P Vinayaga
authors.initials: PV
authors.lastname: Moorthi
mesh_terms: D000330:Aedes / Q000187:drug effects*; D000818:Animals; D001413:Bacillus thuringiensis / Q000378:metabolism*; D007306:Insecticides / Q000494:pharmacology*; D007814:Larva / Q000187:drug effects; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles / Q000382:microbiology*; D010316:Particle Size; D012834:Silver / Q000494:pharmacology*; D020349:Surface Plasmon Resonance
chemical_list: D007306:Insecticides; D012834:Silver