检索结果-南通市图书馆

Spectral Evidence for the One-Step Three-Electron Oxidation of Phenylsufinylacetic Acid and Oxalic Acid by Cr(VI)

American Journal of Analytical Chemistry 2013年第10期4卷 20-29页

作者： perumal subramaniam Natesan Thamil Selvi Department of Chemistry Govindammal Aditanar College for Women Tiruchendur India Research Department of Chemistry Aditanar College of Arts and Science Tiruchendur India

The co-oxidation of a mixture of phenylsulfinylacetic acid (PSAA) and oxalic acid (OxH2) by Cr(VI) in 20% acetonitrile-80% water (v/v) medium follows third order kinetics, first order, each with respect to PSAA, OxH2 and Cr(VI). The reaction involves nucleophilic attack of sulfur atom of PSAA on chromium of the oxidizing species, Cr(VI)-OxH2 to form a ternary complex, Cr(VI)-OxH2-PSAA followed by a one-step three-electron reduction of Cr(VI) to Cr(III) and simultaneous oxidation of both the substrates. The reaction is catalysed by Mn2+ ion while retarded by Al3+ ion. Electron releasing substituents in the meta- and para-positions of the phenyl ring of PSAA enhance the rate of co-oxidation while electron withdrawing substituents retards the reaction. The Hammett plots at different temperatures exhibit excellent correlation with negative ρ values. The reaction series obey isokinetic relationship and the observed isokinetic temperature is lying below the experimental range of temperature.

关键词： Phenylsulfinylacetic Acid Oxalic Acid Co-Oxidation Nucleophilic Attack of Sulfur Three-Electron Transfer Substituent Effect

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Phytochemical profiling and biological activity of Plectranthus amboinicus(Lour.) mediated by various solvent extracts against Aedes aegypti larvae and toxicity evaluation

引用

Asian Pacific Journal of Tropical Medicine 2020年第11期13卷 494-502页

作者： Deepak Paramasivam Balamuralikrishnan Balasubramanian Sungkwon Park Palanisamy Alagappan Tanushri Kaul Wenchao Liu perumal Pachiappan Department of Biotechnology School of BiosciencesPeriyar UniversitySalemTamil Nadu-636011India Department of Biotechnology Rathnavel Subramaniam College of Arts and ScienceSulur-641402Tamil NaduIndia Department of Food Science and Biotechnology College of Life ScienceSejong UniversitySeoul-05006South Korea Nutritional Improvement of Crops International Centre for Genetic Engineering and BiotechnologyAruna Asaf Ali MargNew Delhi 110067India Department of Animal Science College of AgricultureGuangdong Ocean UniversityZhanjiangGuangdong 524088China Department of Marine Science School of Marine SciencesBharathidasan UniversityTiruchirappalli-620024Tamil NaduIndia

Objective:To analyze the phytochemical compounds and to investigate the bio-toxic efficacy of various solvent extracts of Plectranthus amboinicus against mosquito larvae activity and lethality on non-targeting ***:The methanol,ethyl acetate,hexane,and aqueous extracts of Plectranthus amboinicus were subjected to analyze the mosquitocidal activity against the dengue vector,Aedes aegypti and toxicity assays on zebra fish and brine *** replications were performed,and negative control was also ***,ethyl acetate extract of Plectranthus amboinicus was chosen for the determination of bio-active ***:The mosquitocidal assays of methanol and ethyl acetate extracts of Plectranthus amboinicus showed the maximal activity with minimal concentration against the 4 th instar mosquito-larvae of Aedes aegypti through the following lethal concentration(LC50 and LC90)values:53.36&92.51μg/m L and 13.64&86.09μg/mL,*** addition,the plant extracts showed no toxicity on zebra fish embryo and brine shrimp *** gas-chromatography analysis of the ethyl acetate extract of Plectranthus amboinicus revealed the presence of seven different *** them,PAEA-fraction 60 contained a major active bioactive compound,hexadecanoic acid,methyl ester(270.0).Conclusions:Plectranthus amboinicus possesses mosquitocidal properties and could be used as a potential alternative source for preparing the mosquitocidal agents.

关键词： Plectranthus amboinicus Cold percolation Indian borage Mosquitocidal

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：