Cogent Chemistry最新文献_第10页

Synthesis, characterization and biological activity studies of certain 1-((benzo[d]thiazol-2-yl) methyl)-4,5-dihydro-3-methyl-N-phenyl-1H-pyrazol-5-imine and 2-((5-aryl-1H-1,2,4-triazol-3-yl) methyl)benzo[d]thiazoles 某些1-((苯并[d]噻唑-2-基)甲基)-4,5-二氢-3-甲基- n -苯基- 1h -吡唑-5-亚胺和2-((5-芳基- 1h -1,2,4-三唑-3-基)甲基)苯并[d]噻唑的合成、表征和生物活性研究

Cogent Chemistry Pub Date : 2017-01-01 DOI: 10.1080/23312009.2017.1312673

P. Uma, K. Rajanna, Firasath Unnisa, P. Saiprakash

引用次数: 2

Flavonoids from Artocarpus hirsutus Lam: Synthesis of new prenyl ethers, acetates and their anti-acne activity 毛果中黄酮类化合物：新型丁醚、醋酸酯的合成及其抗痤疮活性

Cogent Chemistry Pub Date : 2017-01-01 DOI: 10.1080/23312009.2017.1416557

M. Nayak, A. Nagarajan, M. Majeed, M. Jamsheeda, A. Choudhury

{"title":"Flavonoids from Artocarpus hirsutus Lam: Synthesis of new prenyl ethers, acetates and their anti-acne activity","authors":"M. Nayak, A. Nagarajan, M. Majeed, M. Jamsheeda, A. Choudhury","doi":"10.1080/23312009.2017.1416557","DOIUrl":"https://doi.org/10.1080/23312009.2017.1416557","url":null,"abstract":"Abstract Artocarpus hirsutus Lam., one of the species of Artocarpus, is not well studied. The present study is intended to isolate the chemical constituents present in stem wood extract of A. hirsutus, to synthesize their new derivatives and to evaluate their activity against Propionibacterium acnes. Three major flavonoids, cudraflavone A, cycloartocarpin and artocarpin were isolated from the stem wood extract and cudraflavone A was isolated for the first time from this plant. New prenyl ether and acetate derivatives of isolated flavonoids have been synthesized. This is the first to report on the evaluation of in vitro anti-acne potential of crude extracts, isolated flavonoids and their new synthetic derivatives. The crude extracts (MIC values 2, 4 and 15.6 μg/mL) and the isolated constituents (MIC values 2, 0.5 and 0.25 μg/mL) showed significant in vitro anti-acne activity against P. acnes which was comparable with commercially available anti-acne agent, tea tree, oil and a standard antibiotic, Clindamycin (MIC 0.03 μg/mL) indicating their potential as anti-acne agents.","PeriodicalId":10640,"journal":{"name":"Cogent Chemistry","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23312009.2017.1416557","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43546170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Crystal structure of bis(triphenylphosphonium) hexabromodigallate(II) in the correct space group: Conformational complexity in a heteroethane 二(三苯基膦)六溴二二酸(II)在正确空间群中的晶体结构:异乙烷的构象复杂性

Cogent Chemistry Pub Date : 2016-12-31 DOI: 10.1080/23312009.2016.1273065

O. Marasco, Sydney K. Wolny, Jackson P. Knott, Daniel Stuart, T. L. Roemmele, R. Boere

引用次数: 0

Structure, spectral, electrical, and second harmonic generation studies of Fe3+ doped MnS single crystals Fe3+掺杂MnS单晶的结构、光谱、电学和二次谐波生成研究

Cogent Chemistry Pub Date : 2016-12-31 DOI: 10.1080/23312009.2016.1269599

Chithrakshi Prathap, Aashis S. Roy, Raghavendra Sagar

{"title":"Structure, spectral, electrical, and second harmonic generation studies of Fe3+ doped MnS single crystals","authors":"Chithrakshi Prathap, Aashis S. Roy, Raghavendra Sagar","doi":"10.1080/23312009.2016.1269599","DOIUrl":"https://doi.org/10.1080/23312009.2016.1269599","url":null,"abstract":"Abstract In this present work, we report the growth, optical, and electrical studies of inorganic single crystals of manganese sulfate and FeCl3-doped manganese sulfate grown by slow evaporation technique. Crystal structure and lattice parameters of the grown crystals were determined using powder X-ray diffraction and the studies confirm the formation of orthorhombic structure. The UV–vis spectroscopic measurement illustrates the grown crystals with good optical transparency in the visible region and less absorbance. Optical constants such as the band gap, refractive index, extinction coefficient, optical and electrical conductance reveals the good optical response of the material. The Fourier transform infrared spectroscopic analysis infers that there is a small change in the peak position and transmittance in the case of MnS:Fe3+ crystal which ensures the incorporation of Fe3+ ion to the host crystal. Second harmonic generation efficiency tested by Kurtz and Perry method showed the improvement in relative conversion efficiency compared with potassium dihydrogen phosphate.","PeriodicalId":10640,"journal":{"name":"Cogent Chemistry","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23312009.2016.1269599","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60090769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

A green approach to synthesize controllable silver nanostructures from Limonia acidissima for inactivation of pathogenic bacteria 以酸柠檬为原料合成可控银纳米结构灭活致病菌的绿色途径

Cogent Chemistry Pub Date : 2016-12-31 DOI: 10.1080/23312009.2016.1144296

E. Chandra Sekhar, K. K. Krishna Rao, K. Madhusudana Rao, S. Pradeep Kumar

{"title":"A green approach to synthesize controllable silver nanostructures from Limonia acidissima for inactivation of pathogenic bacteria","authors":"E. Chandra Sekhar, K. K. Krishna Rao, K. Madhusudana Rao, S. Pradeep Kumar","doi":"10.1080/23312009.2016.1144296","DOIUrl":"https://doi.org/10.1080/23312009.2016.1144296","url":null,"abstract":"Abstract Controllable silver nanoparticles were developed by a green approach using extracts of both leaves and bark of Limonia acidissima tree. Due to the presence of phytochemical compounds in L. acidissima leaves and bark; such as saponins, phenolic compounds, phytosterols, and quinines present in extracts act as reductants, hence the silver nanoparticles were easily produced under mild conditions. The formation and kinetic study of silver nanoparticles were verified by UV–vis spectroscopy. Highly stable and uniform size silver nanoparticles were produced using bark extract reduction than leaf extract and confirmed by dynamic light scattering and transmission electron microscopy analysis. Further we applied antibacterial activity on both Escherichia coli and Bacillus subtilis. The results suggest that the silver nanoparticles suspension exhibits excellent antibacterial activity. The present study is a simple and eco-friendly approach for production of silver nanoparticles in the large scale up and could be easily commercialized, especially biological applications.","PeriodicalId":10640,"journal":{"name":"Cogent Chemistry","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23312009.2016.1144296","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60089773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 16

HPTLC-based quantification of camptothecin in Ophiorrhiza species of the southern Western Ghats in India 印度西高止山脉南部蛇根中喜树碱的hplc定量分析

Cogent Chemistry Pub Date : 2016-12-31 DOI: 10.1080/23312009.2016.1275408

Renjith Rajan, S. Varghese, Rajani Kurup, R. Gopalakrishnan, R. Venkataraman, Krishnan Satheeshkumar, Sabulal Baby

引用次数: 14

Corrosion inhibition properties of the combined admixture of thiocarbanilide and hexadecyltrimethylammoniumbromide on mild steel in dilute acid solutions 硫代碳素与十六烷基三甲基溴化铵复合外加剂在稀酸溶液中对低碳钢的缓蚀性能

Cogent Chemistry Pub Date : 2016-12-30 DOI: 10.1080/23312009.2016.1268377

R. Loto, C. Loto

{"title":"Corrosion inhibition properties of the combined admixture of thiocarbanilide and hexadecyltrimethylammoniumbromide on mild steel in dilute acid solutions","authors":"R. Loto, C. Loto","doi":"10.1080/23312009.2016.1268377","DOIUrl":"https://doi.org/10.1080/23312009.2016.1268377","url":null,"abstract":"Abstract The synergistic effect of the combined admixture of thiocarbanilide and hexadecyltrimethylammoniumbromide on the electrochemical corrosion behavior and inhibition of mild steel in 1 M H2SO4 and HCl acid media was evaluated through weight loss analysis, potentiodynamic polarization technique, and IR spectroscopy. Results show that the admixture performed effectively in both acid solutions with an average HTH inhibition efficiency of 86.2 and 82% in H2SO4 acid from weight loss and potentiodynamic polarization test while the corresponding values in HCl acid are 79 and 80%, respectively. Thermodynamic calculations showed that the compound chemically adsorbed onto the steel surface blocking the diffusion of corrosive anions and simultaneously suppressing the redox electrochemical process responsible for corrosion. Infrared spectroscopic images revealed the presence of the functional groups of the organic compound responsible for corrosion inhibition. Statistical derivations through Analysis of variance analysis confirmed that the inhibitor concentration is the only variable responsible for the inhibition efficiency values. Adsorption of the compound obeyed the Langmuir isotherm model.","PeriodicalId":10640,"journal":{"name":"Cogent Chemistry","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23312009.2016.1268377","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60090728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Synthesis, characterization and antimicrobial properties of cobalt(II) and cobalt(III) complexes derived from 1,10-phenanthroline with nitrate and azide co-ligands 1,10-邻菲罗啉衍生钴(II)和钴(III)配合物的合成、表征和抗菌性能

Cogent Chemistry Pub Date : 2016-11-15 DOI: 10.1080/23312009.2016.1253201

Djuikom Sado Yanick Gaëlle, D. M. Yufanyi, R. Jagan, M. Agwara

引用次数: 24

Theoretical and experimental studies on the corrosion inhibition potentials of 3-nitrobenzoic acid for mild steel in 0.1 M H2SO4 3-硝基苯甲酸在0.1 M H2SO4中对低碳钢缓蚀电位的理论与实验研究

Cogent Chemistry Pub Date : 2016-11-15 DOI: 10.1080/23312009.2016.1253904

P. Ameh, N. Eddy

{"title":"Theoretical and experimental studies on the corrosion inhibition potentials of 3-nitrobenzoic acid for mild steel in 0.1 M H2SO4","authors":"P. Ameh, N. Eddy","doi":"10.1080/23312009.2016.1253904","DOIUrl":"https://doi.org/10.1080/23312009.2016.1253904","url":null,"abstract":"Abstract The inhibition of the corrosion of mild steel in 0.1 M H2SO4 by 3-nitrobenzoic acid was studied using weight loss, electrochemical impedance spectroscopy (EIS), linear polarization resistant, potentiodynamic polarization, scanning electron microscopy, Fourier transformed infra-red spectroscopy and quantum chemical techniques. The results obtained indicated that 3-nitrobenzoic acid inhibited the corrosion of mild steel in solution of H2SO4. Maximum inhibition efficiency obtained from weight loss, potentiodynamic, linear polarization and EIS methods were 87.15, 90.51, 95.42 and 99.40% at inhibitor’s concentration of 0.01 M respectfully. The activation energies (which ranged from 26.02 to 59.02 J/mol) supported the mechanism of charge transfer from charged inhibitor to charged metal surface, which favours the mechanism of physical adsorption. The adsorption of the inhibitor was found to be exothermic and spontaneous. Although the adsorption characteristics of the inhibitor fitted the Langmuir adsorption model, the deviation of slope values from unity was explained by the existent of positive interaction parameters (attractive behaviour of the inhibitor’s molecules) according to the Frumkin model. 3-nitrobenzoic acid is dominantly a cathodic-type inhibitor and prevented the corrosion of mild steel by blocking the metal’s surface. Calculated values of the frontier molecular orbital energies and other semi-empirical parameters were in good agreement with those obtained for known and efficient corrosion inhibitors while Fukui function analysis indicated that the inhibitor is adsorbed unto the metal surface through the delocalization of electrons in the nitro oxygen bond, i.e. O(11)-N(10)-O(12).","PeriodicalId":10640,"journal":{"name":"Cogent Chemistry","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23312009.2016.1253904","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60090663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 33

The components from aerial parts of Sarcosperma affinis Gagnep. and their antibacterial activities 附肉属植物地上部的成分。以及它们的抗菌活性

Cogent Chemistry Pub Date : 2016-11-15 DOI: 10.1080/23312009.2016.1254421

Hoai Thi Nguyen, Duc Viet Ho, Hung Quoc Vo, Trang Huyen Xuan Hoang, T. Kodama, Takuya Ito, H. Morita, A. Raal

引用次数: 3