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Journal of Nanomaterials
Volume 2016, Article ID 4363751, 11 pages
Research Article

Investigation of the Larvicidal Potential of Silver Nanoparticles against Culex quinquefasciatus: A Case of a Ubiquitous Weed as a Useful Bioresource

1Department of Chemistry, Federal University Lafia, PMB 146, Lafia, Nigeria
2Department of Industrial Chemistry, University of Ilorin, Ilorin, Nigeria
3Department of Chemistry, University of Ilorin, Ilorin, Nigeria
4School of Chemistry, University of KwaZulu-Natal, Westville Campus, Durban, South Africa

Received 24 November 2015; Revised 26 February 2016; Accepted 1 March 2016

Academic Editor: Yogendra Mishra

Copyright © 2016 Elijah T. Adesuji et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Biosynthesized silver nanoparticles (AgNPs) using Cassia hirsuta aqueous leaf extract were reported in this study. The synthesis was optimized by measuring various parameters such as temperature, time, volume ratio, and concentration. The surface plasmon resonance at 440 nm for 30°C and 420 nm for both 50°C and 70°C measured using the UV-Vis spectrophotometer confirmed the formation of AgNPs synthesized using C. hirsuta (CAgNPs). The functional groups responsible for the reduction and stabilization of the NPs were identified using Fourier Transform Infrared (FTIR). The morphology, size, and elemental composition of the NPs were obtained using scanning electron microscope (SEM), transmission electron microscope (TEM), and energy dispersive X-ray spectroscopy (EDX). X-ray diffractometer was used to identify the phases and crystallinity of CAgNPs. Crystalline spherical NPs with average diameter of 6.9 ± 0.1 nm were successfully synthesized. The thermal analysis of CAgNPs was observed from DSC-TGA. The larvicidal results against the different larva instar stage of Culex quinquefasciatus gave LC50 = 4.43 ppm and LC90 = 8.37 ppm. This is the first study on the synthesis of AgNPs using C. hirsuta and its application against lymphatic filariasis vector. Hence, it is suggested that the C. hirsuta synthesized AgNPs would be environmentally benign in biological control of mosquito.