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首页> 外文期刊>Physiological and Molecular Plant Pathology >Potential larvicidal activity of silver nanohybrids synthesized using leaf extracts of Cleistanthus collinus (Roxb.) Benth. ex Hook. f. and Strychnos nux-vomica L. nux-vomica against dengue, Chikungunya and Zika vectors
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Potential larvicidal activity of silver nanohybrids synthesized using leaf extracts of Cleistanthus collinus (Roxb.) Benth. ex Hook. f. and Strychnos nux-vomica L. nux-vomica against dengue, Chikungunya and Zika vectors

机译：使用Cleistanthus Collinus（ROXB Qualstancums（ROXB）的叶子提取物合成银纳米胺的潜在幼虫活性。 前钩。 F。 和Strychnos Nux-Vomica L. Nux-Vomica反对登革热，Chikungunya和Zika vectors

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This study focused on green engineering of stable metallic silver nanohybrids (AgNPs) using Cleistanthus collinus (Cc) and Strychnos nux-vomica (Sn) plant leaf extracts via microwave irradiation and its bioinsecticidal activity against the mosquito vectors and antimicrobial efficacy against clinically isolated human pathogens. Engineered silver nanohybrids (CcAgNPs and SnAgNPs) were characterized by UV-vis spectroscopy, Fourier Transform Infra-red spectroscopy (FTIR), X-ray diffraction spectroscopy (XRD), Field Emission Scanning Electron Microscopy (FESEM) and Energy-dispersive X-ray spectroscopy (EDX) analysis. FTIR results showed the role of alcohols, amines, alkanes, and amides in the bioreduction, capping and stabilization of synthesized silver nanoparticles. The XRD analysis confirmed the crystalline structure of the synthesized silver nanohybrids. FESEM results displayed the shape as well as size of the engineered CcAgNPs and SnAgNPs. Interestingly, the synthesized CcAgNPs was found to be triangular and pentagonal shape with 66.27-75.09 nm size and the synthesized SnAgNPs showed irregular, spherical and round shape with 54.45-60.84 nm size. The existence of silver ion signals on engineered nanohybrids at 2.8 to 4 KeV was established by EDX analysis. Further, both C. collinus and S. nux-vomica leaf extracts and engineered CcAgNPs and SnAgNPs showed highest larvicidal activity against Anopheles stephensi and Aedes aegypti fourth instar larvae. The maximum mortality rate (100%) for CcAgNPs was observed at 20 mg/l and 25 mg/l for A. aegypti and A. stephensi vectors respectively, while highest percent of mortality for SnAgNPs was noticed in both A. aegypti and A. stephensi at 25 mg/l. The LC50 dose for CcAgNPs towards A. stephensi and A. aegypti mosquito vectors noticed were 11.05 and 11.38 mg/l, respectively, whereas the LC50 data for SnAgNPs obtained was 8.82 and 7.75 mg/l for A. stephensiand A. aegypti, respectively. The larvicidal activity was positively correlated with the engineered AgNPs exposure. Both CcAgNPs and SnAgNPs found to be effective antimicrobial agent against six human microbial pathogens and these nanohybrids may be considered as effective antibacterial nanodrug. The results strongly suggest that C. collinus and S. nux-vomica plant extracts derived silver nanohybrids can be applied as a natural biolarvicidal compound to vector-control strategy as non-toxic and eco-friendly approach to prohibit Zika, Chikungunya and dengue fever in the future. (C) 2017 Elsevier Ltd. All rights reserved.
机译：本研究专注于使用Cleistanthus Collinus（CC）和Trychnos Nux-V摩中（Sn）植物叶提取物的稳定金属银纳米（AgNP）的绿色工程，并通过微波辐射及其对蚊子载体的抗菌疗效和临床分离的人病原体的抗菌疗效。通过UV-Vis光谱，傅里叶变换红外光谱（FTIR），X射线衍射光谱（XRD），场发射扫描电子显微镜（FESEM）和能量分散X射线，以uV-Vis光谱，傅立叶变换型纳米嗜含量（Ccagnps和SnAgnps）的特征在于特征。光谱学（EDX）分析。 FTIR结果表明醇，胺，烷烃和酰胺在合成银纳米粒子的生物测定，封端和稳定中的作用。 XRD分析证实了合成的银纳米混合物的晶体结构。 FESEM结果显示了设计的形状以及工程化CCAGNP和SnAGNP的尺寸。有趣的是，已发现合成的CCAGNPS是三角形和五边形形状，具有66.27-75.09nm尺寸，合成的脊柱纸张显示出不规则，球形和圆形，尺寸为54.45-60.84nm。通过EDX分析建立了2.8至4keV的工程化纳米油状物上的银离子信号。此外，C.Clinalus和S.Nux-V摩中叶提取物和工程化的Ccagnps和SnAgnps均显示出对Anopheles Stephensi和Aedes Aegypti第四龄幼虫的最高幼虫活性。 CCAGNPS的最大死亡率（100％）分别观察到AEGYPTI和A. Stephensi载体的20mg / L和25mg / L.Stephensi载体，而Aegypti和A的Aegypti和A. Stephensi为25毫克/升。对于A. Stephensi和A.的CCAGNPS的LC50剂量分别注意到斯蒂芬西和A. Aegypti蚊香分别为11.05和11.38 mg / L，而获得的SnAgnps的LC50数据分别为A. Stephensiand A. Aegypti的8.82和7.75mg / L.幼虫活性与工程酰胺暴露呈正相关。发现CCAGNP和SNAGNPS都是针对六种人微生物病原体的有效抗微生物剂，并且这些纳米胺可以被认为是有效的抗菌纳米树脂。结果强烈表明，C. Collinus和S.Nux-V摩中植物提取物衍生的银纳米胺可以作为天然生物丙基化合物应用于载体对照策略，作为无毒和环保的方法，以禁止Zika，Chikungunya和登革热未来。 （c）2017 Elsevier Ltd.保留所有权利。

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