Synthesis of copper nanoparticles (CuNPs) from petal extracts of marigold ( Tagetes sp.) and sunflower ( Helianthus sp.) and their effective use as a control tool against mosquito vectors

Abstract

Synthesis and characterization of CuNPs using petal extract of marigold ( Tagetes sp.) and sunflower ( Helianthus sp.) and mosquito larval mortality was studied by synthesized CuNPs against Culex quinquefasciatus . The CuNPs was synthesized by petal extract of marigold and sulflower. The characterization of CuNPs was done with visual colour change, UV-Vis spectrum, Scanning Electron Micrograph (SEM), Fourier transform infrared (FTIR) spectroscopy and phase contrast micrograph. Larvaecidal study was conducted as per standard method. It was recorded that blue colour of copper sulphate changes to reddish colour in aqueous medium. The Surface Plusmon Resonance (SPR) for marigold and sunflower mediated CuNPs shows absorption at 374 nm and 315 nm, respectively. SEM and phase contrast micrograph picture showed that CuNPs are spherical in nature. Moreover, FTIR spectra indicate the different functional groups of biomoleculs involved in the formation and stabilization of CuNPs. Results also revealed that synthesized nanoparticles showed mosquito larval mortality rate 98.8 % and 70 % with marigold and sunflower mediated CuNPs, respectively.  Present results suggest that green synthesis of CuNPs has immense potentiality to kill the mosquito larvae of  Culex quinquefasciatus. The novelty of this work is that for the first time marigold and sunflower petal extract was used for the synthesis of CuNPs.