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. 2019 Jan 11;10(1):27.
doi: 10.3390/insects10010027.

Larvicidal Activity of Synthesized Silver Nanoparticles from Curcuma zedoaria Essential Oil against Culex quinquefasciatus

Nataya Sutthanont  1   2 , Siriluck Attrapadung  3 , Surang Nuchprayoon  4   5
Affiliations

Larvicidal Activity of Synthesized Silver Nanoparticles from Curcuma zedoaria Essential Oil against Culex quinquefasciatus

Nataya Sutthanont et al. Insects. .

Abstract

Culex quinquefasciatus is the major vector of the bancroftian filarial parasite which causes human lymphatic filariasis and St. Louis encephalitis. The simple way to stop the transmission is to control the vector by using synthetic chemicals. However, herbal essential oils have biological properties, such as a larvicidal effect and are ecofriendly to use. In this study, we investigated the larvicidal activity of Curcuma zedoaria essential oil (ZEO) and biosynthesized silver nanoparticles using this essential oil (ZEO-AgNPs). The larvicidal activity against both insecticide-susceptible and -resistant strains of Cx. quinquefasciatus larvae of ZEO were investigated and compared with ZEO-AgNPs. The ZEO-AgNPs showed the utmost toxicity against both strains of Cx. quinquefasciatus. After 24 h of exposure, LC50 and LC99 of ZEO against susceptible strain were 36.32 and 85.11 ppm, respectively. While LC50 and LC99 of ZEO against the resistant strain were 37.29 and 76.79 ppm, respectively. Whereas ZEO-AgNPs offered complete larval mortality within 24 h of exposure, LC50 and LC99 of ZEO-AgNPs against the susceptible strain, were 0.57 and 8.54 ppm, respectively. For the resistant strain, LC50 and LC99 values were 0.64 and 8.88 ppm, respectively. The potency in killing Cx. quinquefasciatus and stability of ZEO-AgNPs have made this product a good candidate for the development of novel natural larvicides.

Keywords: mosquito control; plant-based insecticide; silver nanoparticles; white turmeric; zedoary.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Preparation procedure of AgNPs, and UV/VIS spectroscopy. (a) The reactant before and then the product after the reaction. (b) UV/VIS spectroscopy of AgNPs. The maximum absorption peak of ZEO-AgNPs was 415 nm.
Figure 2
Figure 2
(a) Scanning Electron Microscopy (SEM) image and (b) Energy dispersive X-ray spectrometry (EDX) pattern of AgNPs synthesized with C. zedoaria oil (ZEO-AgNPs).
Figure 3
Figure 3
X-ray diffraction (XRD) pattern of AgNPs synthesized using C. zedoaria oil (ZEO-AgNPs).
Figure 4
Figure 4
Fourier transform infrared (FTIR) absorption spectra of AgNPs synthesized using C. zedoaria oil (ZEO-AgNPs).
See this image and copyright information in PMC

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