African Journal of Pure and Applied Chemistry最新文献_第10页

Substituent effects of 2-aryl-trans-decahydroquinolin-4- ones in CTADC oxidation: Spectrophotometric approach 2-芳基反式十氢喹啉-4-在CTADC氧化中的取代效应:分光光度法

African Journal of Pure and Applied Chemistry Pub Date : 2014-03-27 DOI: 10.5897/AJPAC2014.0555

N. Sharmila, R. Rao, B. B. Hari, G. Trimurtulu, P. Satyanarayana

引用次数: 0

Adsorption kinetics of 2-chloroacétophénone and 4- bromoacétophénone thiosemicarbazone on Oueme Valley clays (R. Benin) 2-氯嘧啶和4-溴嘧啶嘧啶硫代氨基脲在Oueme谷黏土上的吸附动力学

African Journal of Pure and Applied Chemistry Pub Date : 2014-03-27 DOI: 10.5897/AJPAC2014.0537

Tadjou Do Rego, Serge Fredys, Rodrigue O. Senou, F. Dimon, S. Kpoviessi, Alban G. Houngbèmè, C. A. Eni, G. Accrombessi, F. Gbaguidi

引用次数: 1

Studies on urea treated rice milling waste and its application as animal feed 尿素处理碾米废料及其饲料应用研究

African Journal of Pure and Applied Chemistry Pub Date : 2014-02-28 DOI: 10.5897/AJPAC2013.0532

Terver Ubwa Simon, Abah James, Atsinafe Oshido Barnabas, Otokpa Esther

{"title":"Studies on urea treated rice milling waste and its application as animal feed","authors":"Terver Ubwa Simon, Abah James, Atsinafe Oshido Barnabas, Otokpa Esther","doi":"10.5897/AJPAC2013.0532","DOIUrl":"https://doi.org/10.5897/AJPAC2013.0532","url":null,"abstract":"The composition of urea treated rice milling waste and its application as animal feed was studied. The proximate analysis of the urea treated rice milling waste showed that it contained 94.90% dry matter, 10.38% crude protein, 5.89% crude fibre, 0.16% ether extract, 7.47% ash, and 54.81% nitrogen-free extracts. The untreated rice milling waste contained 94.34% dry matter, 9.11% crude protein, 6.37% crude fibre, 0.18% ether extract, 8.11% ash, and 54.69% nitrogen-free extracts. Four experimental diets were prepared containing two different levels (30 and 35%) each of untreated and urea treated rice milling waste mixed with commercial pelletized chick mash to assess their effects on weaner rabbits. Data on the feed intake, growth rate, and feed conversion ratio (FCR) of weaner rabbits fed diets containing two different levels each of untreated and urea treated rice milling waste were compared using two-way analysis of variance (ANOVA). There were no significant effects (P > 0.05) of dietary treatment and level of inclusion for average feed intake, average body weight gain, and the FCR. The study indicated that rabbits can be successfully raised on a commercial chick mash mixed with 35% rice milling waste treated or untreated without any adverse effect on growth.","PeriodicalId":7556,"journal":{"name":"African Journal of Pure and Applied Chemistry","volume":"1 1","pages":"23-31"},"PeriodicalIF":0.0,"publicationDate":"2014-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90267604","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: 10

Phytochemical study on the benzene:acetone extract of the leaves of Artabotrys odoratissimus 香树叶苯丙酮提取物的植物化学研究

African Journal of Pure and Applied Chemistry Pub Date : 2014-02-28 DOI: 10.5897/AJPAC2013.0536

Danish Faizan, M. Zuber S., K. Mehta B., Mehta Darshina, R. Kolisetty S.

{"title":"Phytochemical study on the benzene:acetone extract of the leaves of Artabotrys odoratissimus","authors":"Danish Faizan, M. Zuber S., K. Mehta B., Mehta Darshina, R. Kolisetty S.","doi":"10.5897/AJPAC2013.0536","DOIUrl":"https://doi.org/10.5897/AJPAC2013.0536","url":null,"abstract":"Artabotrys odoratissimus has been investigated by many workers for its constituents. The compounds so far isolated from the leaves of A. odoratissimus are Pentadecyl-7-hydroxy- dodecanote, Pentadecyltritriacontanonte, 4,5-epoxy -26-ol- dopentacontane, β-Sitosterol, Aplysterol, Nonacosanylhexaconsanoate, Pentatetraacont-19-ol, triacont-2-ol, Dotriacont-7-ene, Octacose-7-ene, 1-hydroxy-2,5-dimethyl-9,10-anthraquinone, 1,4,5-trihydroxy-9,10-anthraquinone, 13-hydroxynonacosane, Nonanoicacid, Methylphenyl propanoate, Decanoicacid, Diethylphthalate, Dibutylphthalate, 2-amino-3-ethylbipheny-l, 5-methyl-9-phenylnonane-3-ol, 1-phenylundecane, 2,5-dimethyl-1-phenylheptane1-one, hexadeca-2,7,11-triene, 1-isopropyl-4,6-dimethylnaphthalene, 1-phenyldeca-1-one, 1-phenylundecan-1-one, 5-(2-butylphenyl)pent-3-en-2-ol, 2,5-dimethyltetradecanhydro phenenthrene So far, not many studies have been carried out on this genus but there are some reports on this plant. Previous phytochemical studies have revealed this genus to be rich in secondary metabolites including phenylcoumarins, xanthones and triterpenoids. Our recent study on the benzene:acetone extract of the leaves of A. odoratissimus, have led to the isolation of steroidal compound. The structure of the compound has been established by modern spectroscopic techniques such as Infrared Spectrometry (IR), Hydrogen-Nuclear Magnetic Resonance Spectrometry (1H-NMR), Carbon-Nuclear Magnetic Resonance Spectrometry (13C-NMR) and Mass-Spectroscopy and identified as 2β- hydroxy- Stigmasta- 4- en-3, 6- dione- Methoxy ester. \u0000 \u0000 Key words: Artabotrys odoratissimus, medicinal plant, new compound, spectral analysis.","PeriodicalId":7556,"journal":{"name":"African Journal of Pure and Applied Chemistry","volume":"76 1","pages":"32-36"},"PeriodicalIF":0.0,"publicationDate":"2014-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79710366","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: 2

Inhibitory action of Albizia zygia gum on mild steel corrosion in acid medium 合欢胶对酸性介质中低碳钢腐蚀的抑制作用

African Journal of Pure and Applied Chemistry Pub Date : 2014-02-28 DOI: 10.5897/AJPAC2014.0549

P. Ameh

{"title":"Inhibitory action of Albizia zygia gum on mild steel corrosion in acid medium","authors":"P. Ameh","doi":"10.5897/AJPAC2014.0549","DOIUrl":"https://doi.org/10.5897/AJPAC2014.0549","url":null,"abstract":"The corrosion and inhibition behaviours of mild steel in sulphuric acid in the presence of Albizia zygia gum (AZ) have been studied using the weight loss, gasometric, Fourier transform infrared (FTIR) and thermometric techniques. The temperature studies reflect that the percentage of inhibition efficiency is decreased with rise in temperature and that indicates the mechanism of physical adsorption. The calculated values of activation energy (Ea) also support the physisorption process. The thermodynamic parameters such as heat of adsorption (Qads) and free energy of adsorption (ΔGads) are suggested that the adsorption of inhibitor on the mild steel surface is exothermic and followed by spontaneous process. The adsorption of the inhibitor on mild steel surface involves the formation of multimolecular layer through C-H bending vibrations due to alkenes at 703.08 and 933.58.01 cm-1, C-O stretches due to carboxylic acid, ester, ether and alcohol at 1084.03 and 1150.58 cm-1, C-O stretch due to ketone /aldehyde/carboxylic acid at 1826.65 cm-1, C-H aliphatic stretch at 2820.99 cm-1 and C-H stretch at 3026.41.79 cm-1, which support physical adsorption. The observed results indicate that A. zygia gum could serve as an effective inhibitor on mild steel in sulphuric acid. \u0000 \u0000 Key words: Albizia zygia gum, thermodynamics, mild steel, sulphuric acid, adsorption.","PeriodicalId":7556,"journal":{"name":"African Journal of Pure and Applied Chemistry","volume":"36 1","pages":"37-46"},"PeriodicalIF":0.0,"publicationDate":"2014-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90592873","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: 14

Preconcentration of Cd(II) by chemically converted graphene sheets adsorbed on surfactant- coated C18 before determination by flame atomic absorption spectrometry (FAAS) 表面活性剂C18吸附化学转化石墨烯片预富集Cd(II)，火焰原子吸收光谱法测定

African Journal of Pure and Applied Chemistry Pub Date : 2014-01-31 DOI: 10.5897/AJPAC2013.0542

A. Moghimi, M. Farahmandjou

{"title":"Preconcentration of Cd(II) by chemically converted graphene sheets adsorbed on surfactant- coated C18 before determination by flame atomic absorption spectrometry (FAAS)","authors":"A. Moghimi, M. Farahmandjou","doi":"10.5897/AJPAC2013.0542","DOIUrl":"https://doi.org/10.5897/AJPAC2013.0542","url":null,"abstract":"A simple, highly sensitive, accurate and selective method for determination of trace amounts of Cd(II) in water samples is presented. A novel chemically converted graphene sheets (CCG) solid-phase extraction adsorbent was synthesized by CCG sheets. The stability of a CCG especially in concentrated hydrochloric acid was studied which used as a recycling and preconcentration reagent for further uses of CCG. The method is based on CCG of Cd(II) on surfactant-coated C18, modified with a CCG. The retained ions were then eluted with 4 ml of 4 M nitric acid and determined by flame atomic absorption spectrometry (FAAS) at 283.3 nm for Cd. The influence of flow rates of sample and eluent solutions, pH, breakthrough volume, effect of foreign ions on chelation and recovery were investigated. 1.5 g of surfactant-coated C18 adsorbs 40 mg of the Schiff’s base which in turn can retain 15.2 ± 0.8 mg of each of the two ions. The limit of detection (3σ) for Cd(II) was found to be 3.20 ng L-1. The enrichment factors for both ions are 100. The mentioned method was successfully applied on determination of Cd in different water samples. The ions were also speciated by means of three-column system. Key words: Determination of Cd, preconcentration, chemically converted graphene sheets (CCG), flame atomic absorption spectrometry (FAAS).","PeriodicalId":7556,"journal":{"name":"African Journal of Pure and Applied Chemistry","volume":"20 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2014-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79196289","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

Inhibition of mild steel corrosion using Juniperus plants as green inhibitior 杜松作为绿色缓蚀剂对低碳钢的缓蚀作用

African Journal of Pure and Applied Chemistry Pub Date : 2014-01-17 DOI: 10.5897/AJPAC2013.0497

S. Al-Mhyawi

引用次数: 23

Microstructure contradistinction for indirect/direct desulfurization product layer of limestone particle in coal-fired flue gas 燃煤烟气中石灰石颗粒间接与直接脱硫产物层的微观结构对比

African Journal of Pure and Applied Chemistry Pub Date : 2013-11-30 DOI: 10.5897/AJPAC2013.0523

Jianyu Shang, Zhongliang Liu, Chunbo Wang

{"title":"Microstructure contradistinction for indirect/direct desulfurization product layer of limestone particle in coal-fired flue gas","authors":"Jianyu Shang, Zhongliang Liu, Chunbo Wang","doi":"10.5897/AJPAC2013.0523","DOIUrl":"https://doi.org/10.5897/AJPAC2013.0523","url":null,"abstract":"The micro morphology of limestone sorbent is a key for improving the SO2 removal efficiency in the coal-fired power plant. The tube furnace system was built for imitating the indirect desulfurization reaction in traditional boiler atmosphere (65%N2, 15%CO2, 4.7%O2, 15%H2O, 0.3%SO2) and the direct desulfurization reaction in oxygen-fired atmosphere (80%CO2, 4.7%O2, 15%H2O, 0.3%SO2). The reacted limestone particle samples were observed by SEM and are analyzed by Fourier transformation 3-D reconstruction technique. It is shown that the sizes of internal pore within sorbent particle in two kind atmospheres differ by an order of magnitude, one is about 200 nm for indirect desulfurization, and the other is about 20 nm for direct desulfurization. The CaSO4 products of indirect desulfurization are chaotic derivatives with serious blockage, and the direct desulfurization product layer belongs to uniform honeycombed micro-structure without blockage. Those numerous micro-porous passages can guarantee continuous reactive substance transmission. \u0000 \u0000 Key words: Limestone powder, SO2 removal, particle surface, 3-D reconstruction, product layer.","PeriodicalId":7556,"journal":{"name":"African Journal of Pure and Applied Chemistry","volume":"29 1","pages":"370-374"},"PeriodicalIF":0.0,"publicationDate":"2013-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76318260","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: 1

Didecanoate compound: Isolated from Momordica charantia Linn. seeds from Nigeria 二癸酸酯化合物:从苦瓜中分离得到。尼日利亚种子

African Journal of Pure and Applied Chemistry Pub Date : 2013-11-30 DOI: 10.5897/AJPAC2013.0528

N. Leonard, O. Olutayo, O. Otu, K. Simon

引用次数: 2

Potentials of Nigerian calcined kaolin as paint pigment 尼日利亚煅烧高岭土作为油漆颜料的潜力

African Journal of Pure and Applied Chemistry Pub Date : 2013-11-29 DOI: 10.5897/AJPAC2013.0530

F. Alabi, O. Omojola.M.

引用次数: 4