A facile and rapid method for green synthesis of Achyranthes aspera stem extract-mediated silver nano-composites with cidal potential against Aedes aegypti L.

Publication date: May 2019Source: Saudi Journal of Biological Sciences, Volume 26, Issue 4Author(s): Aarti Sharma, Sarita Kumar, Pushplata TripathiAbstractAedes aegypti L. is the primary vector associated with transmission of globally concerned diseases; Zika, yellow fever, dengue and Chikungunya. Present study investigates an efficient, alternative and comparative approach for mosquito control which is safe to environment and non-target organisms. The silver nano-composites (AgNCs) were synthesized from the aqueous stem extract of Achyranthes aspera (AASE) using different concentration of aqueous silver nitrate (AgNO3). The synthesis was tracked by UV-vis spectrophotometer and particle size analyser (DLS). The evaluation of their larvicidal potential against early fourth instars of Ae. aegypti showed significant potency, the toxicity increasing with the concentration of silver nitrate. The 24, 48 and 72 h bioassays resulted in respective LC50 values of 26.693, 1.113 and 0.610 μg/mL (3 mM AASE-AgNO3) 9.119, 0.420 and 0.407 μg/mL (4 mM AASE-AgNO3) and that of 4.283, 0.3 and 0.248 μg/mL (5 mM AASE-AgNO3). Keeping in view the significantly high larvicidal efficiency at lower concentration of silver nitrate, the 4 mM nano-composites were selected over 5 mM composites for further biophysical characterization carried out by X-ray Diffraction (XRD), Fourier transform infrared spectrometer (FTIR), Scanning electron microscopy (SEM), Energy dispersive X-ray (EDX) ...
Source: Saudi Journal of Biological Sciences - Category: Biology Source Type: research