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- 저자 : R. Regina Mary (검색결과 1 건)
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P. Rajiv Gandhi,C. Jayaseelan,E. Vimalkumar,R. Regina Mary 한국응용곤충학회 2016 Journal of Asia-Pacific Entomology Vol.19 No.4
Insecticide resistance and inadequate attention to the application instructions of topical pediculicides are common reasons for treatment failure. Essential oils or plant extracts are good and safe alternatives due to their low toxicity to mammals and easy biodegradability. The present study was carried out to establish the larvicidal and the pediculicidal activity of synthesized titaniumdioxide nanoparticles (TiO2 NPs) using the leaf aqueous extract of Vitex negundo (Verbenaceae) against the fourth instar larvae of the malaria vector, Anopheles subpictus Grassi and filariasis vector, Culex quinquefasciatus Say (Diptera: Culicidae) and the head louse, Pediculus humanus capitis De Geer (Phthiraptera: Pediculidae). The synthesized TiO2 NPs were characterized by UV, XRD, FTIR and SEM-EDX. The SEManalyseswere clearly indicated that the spherical shape of the synthesized TiO2 NPs. Mosquito larvae and head licewere exposed to varying concentrations of the synthesized TiO2 NPs, V. negundo leaf aqueous extract and titanium tetrachloride (TiCl4) for 24 h. The maximum activity was observed in the synthesized TiO2 NPs against A. subpictus, C. quinquefasciatus and lice, (LC50 = 7.52, 7.23 and 24.32 mg/L; χ2 = 0.161, 2.678 and 4.495; r2 = 0.663, 0.742 and 0.924), respectively. The TiO2 NPs did not exhibit any noticeable toxicity on Poecilia reticulata after 24 h of exposure. The findings revealed that the synthesized TiO2 NPs possess excellent mosquito larvicidal and anti-lice activity. These results suggest that the green synthesis of TiO2 NPs has the potential to be used as an ideal eco-friendly approach for the control of vectors and head lice.Insecticide resistance and inadequate attention to the application instructions of topical pediculicides are common reasons for treatment failure. Essential oils or plant extracts are good and safe alternatives due to their low toxicity to mammals and easy biodegradability. The present study was carried out to establish the larvicidal and the pediculicidal activity of synthesized titaniumdioxide nanoparticles (TiO2 NPs) using the leaf aqueous extract of Vitex negundo (Verbenaceae) against the fourth instar larvae of the malaria vector, Anopheles subpictus Grassi and filariasis vector, Culex quinquefasciatus Say (Diptera: Culicidae) and the head louse, Pediculus humanus capitis De Geer (Phthiraptera: Pediculidae). The synthesized TiO2 NPs were characterized by UV, XRD, FTIR and SEM-EDX. The SEManalyseswere clearly indicated that the spherical shape of the synthesized TiO2 NPs. Mosquito larvae and head licewere exposed to varying concentrations of the synthesized TiO2 NPs, V. negundo leaf aqueous extract and titanium tetrachloride (TiCl4) for 24 h. The maximum activity was observed in the synthesized TiO2 NPs against A. subpictus, C. quinquefasciatus and lice, (LC50 = 7.52, 7.23 and 24.32 mg/L; χ2 = 0.161, 2.678 and 4.495; r2 = 0.663, 0.742 and 0.924), respectively. The TiO2 NPs did not exhibit any noticeable toxicity on Poecilia reticulata after 24 h of exposure. The findings revealed that the synthesized TiO2 NPs possess excellent mosquito larvicidal and anti-lice activity. These results suggest that the green synthesis of TiO2 NPs has the potential to be used as an ideal eco-friendly approach for the control of vectors and head lice.
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