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Silver nanoparticles containing stearic acid isolated from Catharanthus roseus: Ovicidal and oviposition-deterrent activities on Earias vittella and ecotoxicological studies
Pesticide Biochemistry and Physiology ( IF 4.2 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.pestbp.2020.104640 Manickam Pavunraj 1 , Kathirvelu Baskar 2 , Selvaraj Arokiyaraj 3 , Krishnamoorthy Rajapandiyan 4 , Abdulaziz A Alqarawi 5 , Elsayed Fathi Abd Allah 5
Pesticide Biochemistry and Physiology ( IF 4.2 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.pestbp.2020.104640 Manickam Pavunraj 1 , Kathirvelu Baskar 2 , Selvaraj Arokiyaraj 3 , Krishnamoorthy Rajapandiyan 4 , Abdulaziz A Alqarawi 5 , Elsayed Fathi Abd Allah 5
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In the recent past, many agrochemicals have been used to control pests, but many of these fail due to the development of resistance. Many researchers, therefore, concentrate on developing new pesticide formulations from natural resources (plants/microorganism). In the present study, different extracts from Catharanthus roseus (Madagascar periwinkle) was evaluated for their ovicidal and oviposition deterrent activities against Earias vittella (spiny bollworm). Among the tested extracts DCM (Dichloromethane) extract showed highest ovicidal activity (70.47%) and oviposition deterrent activity (75.41%) against E. vittella. Based on this biological activity, DCM extract was fractionated and isolated 7 fractions; all of these were evaluated for their ovicidal and oviposition deterrent activity against E. vittella. Maximum ovicidal and oviposition deterrent activity was recorded in fraction 5, followed by the 7th fraction. Stearic acid was isolated from fraction 5 and was subjected to nanoparticle synthesis. This nanoparticle was tested for its effects against E. vittella. It was found to exhibit 100% oviposition deterrent and 95% ovicidal activities against E. vittella, and also reduced the protein (53.63%), glutothionine esterase (39.16%), and esterase activity (45.25%) of the treated larvae. The synthesized nanoparticle was subjected to ecotoxicology evaluation against Daphnia sp. (water fleas) and Cyprinus carpio (common carp). The nanoparticle showed >100 mg/L for EC50 and LC50 against both aquatic organisms. Based on the result, it could be studied further to develop the ecofriendly formulation with stability studies for agriculture pest management.
中文翻译：
从长春花中分离出的含有硬脂酸的银纳米粒子：对 Earias vittella 的杀卵和排卵活性和生态毒理学研究
在最近的过去，许多农用化学品已被用于控制害虫，但其中许多因抗性的发展而失败。因此，许多研究人员专注于从自然资源（植物/微生物）开发新的农药制剂。在本研究中，评估了长春花（马达加斯加长春花）的不同提取物对 Earias vittella（多刺棉铃虫）的杀卵和产卵威慑活性。在测试的提取物中，DCM（二氯甲烷）提取物对 E. vittella 显示出最高的杀卵活性 (70.47%) 和产卵威慑活性 (75.41%)。基于这种生物活性，DCM提取物被分馏并分离出7个馏分；评估了所有这些对 E. vittella 的杀卵和产卵威慑活性。最大的杀卵和产卵威慑活性记录在第 5 部分，然后是第 7 部分。从部分 5 中分离出硬脂酸并进行纳米颗粒合成。测试了这种纳米颗粒对 E. vittella 的影响。发现它对 E. vittella 具有 100% 的产卵威慑和 95% 的杀卵活性，并且还降低了处理过的幼虫的蛋白质 (53.63%)、谷硫氨酸酯酶 (39.16%) 和酯酶活性 (45.25%)。合成的纳米颗粒对水蚤进行生态毒理学评估。（水蚤）和鲤鱼（鲤鱼）。纳米颗粒对两种水生生物的 EC50 和 LC50 均显示 >100 mg/L。基于该结果，可以进一步研究开发具有稳定性研究的生态友好型制剂用于农业害虫管理。
更新日期：2020-09-01
中文翻译：
从长春花中分离出的含有硬脂酸的银纳米粒子：对 Earias vittella 的杀卵和排卵活性和生态毒理学研究
在最近的过去，许多农用化学品已被用于控制害虫，但其中许多因抗性的发展而失败。因此，许多研究人员专注于从自然资源（植物/微生物）开发新的农药制剂。在本研究中，评估了长春花（马达加斯加长春花）的不同提取物对 Earias vittella（多刺棉铃虫）的杀卵和产卵威慑活性。在测试的提取物中，DCM（二氯甲烷）提取物对 E. vittella 显示出最高的杀卵活性 (70.47%) 和产卵威慑活性 (75.41%)。基于这种生物活性，DCM提取物被分馏并分离出7个馏分；评估了所有这些对 E. vittella 的杀卵和产卵威慑活性。最大的杀卵和产卵威慑活性记录在第 5 部分，然后是第 7 部分。从部分 5 中分离出硬脂酸并进行纳米颗粒合成。测试了这种纳米颗粒对 E. vittella 的影响。发现它对 E. vittella 具有 100% 的产卵威慑和 95% 的杀卵活性，并且还降低了处理过的幼虫的蛋白质 (53.63%)、谷硫氨酸酯酶 (39.16%) 和酯酶活性 (45.25%)。合成的纳米颗粒对水蚤进行生态毒理学评估。（水蚤）和鲤鱼（鲤鱼）。纳米颗粒对两种水生生物的 EC50 和 LC50 均显示 >100 mg/L。基于该结果，可以进一步研究开发具有稳定性研究的生态友好型制剂用于农业害虫管理。
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