African Journal of Pure and Applied Chemistry最新文献_第2页

Evaluating the potentials of complexing agents in multi-metal extractions using 4,4-(1e,1e)-1,1-(Ethane-1,2-Diylbis(Azan-1-Yl-1ylidene))Bis(5-Methyl-2-Phenyl-2,3-Dihydro-1h-Pyrazol-3-Ol) (H2BuEtP) 4,4-(1e,1e)-1,1-(乙烷-1,2-二基双(azan -1- yl- 1- ylidene)) -(5-甲基-2-苯基-2,3-二氢-1h-吡唑-3-醇)(H2BuEtP)评价络合剂在多金属萃取中的潜力

African Journal of Pure and Applied Chemistry Pub Date : 2022-03-31 DOI: 10.5897/ajpac2021.0882

G. Jackson, Yameso Abasi Cyprian, Newton Ebelegi Augustus

{"title":"Evaluating the potentials of complexing agents in multi-metal extractions using 4,4-(1e,1e)-1,1-(Ethane-1,2-Diylbis(Azan-1-Yl-1ylidene))Bis(5-Methyl-2-Phenyl-2,3-Dihydro-1h-Pyrazol-3-Ol) (H2BuEtP)","authors":"G. Jackson, Yameso Abasi Cyprian, Newton Ebelegi Augustus","doi":"10.5897/ajpac2021.0882","DOIUrl":"https://doi.org/10.5897/ajpac2021.0882","url":null,"abstract":"Heavy metals toxicity has led to the continuous study of new and efficient methods for their removal from the environment. Solvent extraction method was used to study the potentials of the auxiliary complexing agents Ethylenediaminetetraacetic acid (EDTA), Oxalate (C 2 O 42- ), Thiocyanate (SCN - ) and Tartrate (C 4 H 4 O 62- ) ions in the simultaneous extraction of Cadmium, Iron, Nickel and Lead from aqueous solutions buffered to either pH 4.75 or 7.5 using the organic extractant 4,4´-(1 E ,1 E ´)-1,1´-(ethane-1,2-diylbis(azan-1-yl-1ylidene))bis(5-methyl-2-phenyl-2,3-dihydro-1 H -pyrazol-3-ol) (H 2 BuEtP) alone or in the presence 4-butanoyl-2-4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-one (HBuP). 0.001 to 0.1 M of the auxiliary complexing agents and equilibration time of 60 min was used. Distribution ratios and percentage extraction was calculated using raffinates and metal standard absorbances. EDTA, Oxalate and Thiocyanate ions and pH 4.75 was found not suitable for the multi-metal extraction of the four metals attributed to the formation of very stable complexes with these auxiliary complexing agents’ ions masking the extraction of the metals, although statistically, there were no significant differences in most cases between the extractions of the metals in the two buffers. Using the ligand H 2 BuEtP alone with a buffer of pH 7.5 and 0.001 M Tartrate, 7 batches of extraction are theoretically required to achieve 99.9% simultaneous extraction of the four metals as the best result while with the mixed ligands H 2 BuEtP/HBuP organic extractant system, 7 batches are required for 0.001 to 0.005 M Tartrate, 5 batches for 0.05 M Tartrate and 4 batches for 0.01 M Tartrate as the best results. Statistically, there was no significant difference between the two organic phases with the exception being Thiocyanate for Nickel with buffer of pH 7.5 that showed slight synergic effect of HBuP.","PeriodicalId":7556,"journal":{"name":"African Journal of Pure and Applied Chemistry","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74860243","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: 0

Synthesis of N-alkyl-3- (1H-benzimidazolyl) -2-chloroquinoline derivatives potential candidates against infectious organisms n -烷基-3- (1h -苯并咪唑)-2-氯喹啉衍生物的合成

African Journal of Pure and Applied Chemistry Pub Date : 2021-07-12 DOI: 10.5897/AJPAC2020.0857

Gbè Gondo Didier Diomandé, Sagne Jacques Akpa, D. Zon, A. Adjou

引用次数: 0

Analysis of stability of naturally aged single base propellants 自然老化单基推进剂的稳定性分析

African Journal of Pure and Applied Chemistry Pub Date : 2021-03-31 DOI: 10.5897/AJPAC2020.0859

HaliloviÄ‡ Namir, KauÄiÄ-Å kufca Mojca, AdemoviÄ‡ Zahida, BaÅ¡iÄ‡-HaliloviÄ‡ Azra, OmanoviÄ‡ Rasim

{"title":"Analysis of stability of naturally aged single base propellants","authors":"HaliloviÄ‡ Namir, KauÄiÄ-Å kufca Mojca, AdemoviÄ‡ Zahida, BaÅ¡iÄ‡-HaliloviÄ‡ Azra, OmanoviÄ‡ Rasim","doi":"10.5897/AJPAC2020.0859","DOIUrl":"https://doi.org/10.5897/AJPAC2020.0859","url":null,"abstract":"In this work chemical changes in 42 years old single base propellant induced by natural aging were evaluated. The sample was stored for a long time under uncontrolled conditions. The chemical stability was tested using High performance liquid chromatography (HPLC), High-performance thin-layer chromatography (HPTLC), the vacuum stability test (VST), SEM/EDX and visual analysis by Stereo Microscope. Heat flow calorimetry (HFC) method was used for analysis of thermal behavior of the sample. Visual changes in appearance of the 42 years old propellant sample surface were apparent. HPLC analysis showed that the sample contains very low effective stabilizer content ( 2 ml/g). Therefore, the propellant is classified as very unstable. Although the effective stabilizer is almost completely consumed, the sample demonstrated very good thermal properties measured using HFC where the heat flow limit of 114 μW/g was not exceeded. The presence of inorganic stabilizers which could contribute to stability was examined using SEM/EDX. The results showed only presence of C, O and N and traces of Si. It could be assumed that even though all the parent DPA is almost consumed, the remaining daughter stabilizer products continue to protect the propellant from possible self-ignition for a long period of time. \u0000 \u0000 Key words: Propellants, natural aging, chemical stability.","PeriodicalId":7556,"journal":{"name":"African Journal of Pure and Applied Chemistry","volume":"358 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82627240","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

Catalytic activity of using tungsten oxide with hydrogen peroxide for methyl orange degradation 氧化钨与过氧化氢催化降解甲基橙的活性研究

African Journal of Pure and Applied Chemistry Pub Date : 2020-10-31 DOI: 10.5897/ajpac2019.0827

S. N. Eroi, A. S. Ello, D. Diabaté, D. Ossonon, Jocelin Martial Yao

引用次数: 6

Preparation, characterization of raw corncob adsorbent for removal of heavy metal ions from aqueous solution using batch method 原料玉米芯吸附剂的制备及性能研究。原料玉米芯吸附剂用于间歇法去除水中重金属离子

African Journal of Pure and Applied Chemistry Pub Date : 2020-10-31 DOI: 10.5897/AJPAC2019.0817

T. Mélèse, Kasahun Chala, Yihune Ayele, Mitiku Abdisa

{"title":"Preparation, characterization of raw corncob adsorbent for removal of heavy metal ions from aqueous solution using batch method","authors":"T. Mélèse, Kasahun Chala, Yihune Ayele, Mitiku Abdisa","doi":"10.5897/AJPAC2019.0817","DOIUrl":"https://doi.org/10.5897/AJPAC2019.0817","url":null,"abstract":"Corncob adsorbent was prepared through environmental friendly process without any additional chemical treatment. The prepared material was characterized by X-ray diffract meter (XRD), Fourier transform infrared spectroscopy (FTIR) and pH points zero charge techniques. The XRD diffracted pattern of corncob adsorbent did not shows well-defined sharp peaks instead it shows pumps peaks; this indicates that the diffraction patterns of the corncob adsorbent has low crystallinity (amorphous). FTIR characterizations of corncob indicate the presence of functional groups. The point zero charge of corncob adsorbent was found to be 7.05; it can be basic modification of the adsorbate which gave a negative (basic) surface charge for the adsorbent. The effect of corncob dosage, contact time and solution pH were studied at optimum values for removal of Pb, Cd, Cr and Cu metals using Batch method. Adsorption equilibrium data fitted well with the Freundlich isotherm for Pb, Cd and Cu metal ions but Langmuir isotherm for Cr(VI) metal ion. \u0000 \u0000 Key words: Adsorption equilibrium, batch method, corncob, metal ions, optimum values.","PeriodicalId":7556,"journal":{"name":"African Journal of Pure and Applied Chemistry","volume":"55 1","pages":"81-90"},"PeriodicalIF":0.0,"publicationDate":"2020-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90805276","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

Carotenoids identification by HPTLC-MS and vitamin C content of fruits of Saba senegalensis (A. DC) Pichon 用HPTLC-MS鉴别塞内加尔沙巴果实的类胡萝卜素和维生素C含量

African Journal of Pure and Applied Chemistry Pub Date : 2020-07-31 DOI: 10.5897/AJPAC2020.0832

A. Noba, Moumouni Koala, A. Hema, R. Bationo, C. E., Eloi Pal e, M. Nacro

{"title":"Carotenoids identification by HPTLC-MS and vitamin C content of fruits of Saba senegalensis (A. DC) Pichon","authors":"A. Noba, Moumouni Koala, A. Hema, R. Bationo, C. E., Eloi Pal e, M. Nacro","doi":"10.5897/AJPAC2020.0832","DOIUrl":"https://doi.org/10.5897/AJPAC2020.0832","url":null,"abstract":"Saba senegalensis fruits have gained more attention in recent years due to their antioxidant compounds such as carotenoids, phenolics, vitamin C. This study was designed to identify the main carotenoids from S. senegalensis fruits including phenolics and vitamin C quantifications. Carotenoid profiles from tissues of these fruits have been characterized by High Performance Thin Layer Chromatography- mass spectrometry (HPTLC-MS) for the first time. Phenolics and vitamin C contents were studied using spectrophotometric and high-performance liquid chromatography-diode-array detector (HPLC-DAD) methods, respectively. Using the Folin-Ciocalteu’s reagent, total phenolics content was estimated to be around 630 mg gallic acid equivalents/100 g fresh fruit of S. senegalensis. The HPLC analysis showed vitamin C content of about 1511 µg/100 g fresh weight. Three xanthophylls (antheraxanthin, lutein, and β-cryptoxanthin), and two hydrocarbon carotenes (β-carotene and phytoene) were identified in the saponified extract of fruits. For radical-scavenging activity, using 2,2-diphenyl-1-picrylhydrazyl (DPPH) method, S. senegalensis fruits extract was estimated to be 75 mg of Trolox equivalents/100 g fresh weight for whole fruit. Results obtained indicate that S. senegalensis fruits are a cheap source of carotenoids and other micronutrients. They are important for industrials and as an ingredient used in functional food formulation. \u0000 \u0000 Key words: Carotene, β-carotene, pigment, antioxidants, fruit extract, functional food.","PeriodicalId":7556,"journal":{"name":"African Journal of Pure and Applied Chemistry","volume":"20 1","pages":"60-68"},"PeriodicalIF":0.0,"publicationDate":"2020-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84395969","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

Geographical variation in total phenolics, flavonoids and antioxidant activities of Eucalyptus camaldulensis leaves in Burkina Faso 布基纳法索山梨树叶片总酚、总黄酮和抗氧化活性的地理变异

African Journal of Pure and Applied Chemistry Pub Date : 2020-07-31 DOI: 10.5897/AJPAC2020.0837

Ebba Rosendal, Jean Claude W. Ou edraogo, C. Dicko, E. Dey, Y. Bonzi-Coulibaly

{"title":"Geographical variation in total phenolics, flavonoids and antioxidant activities of Eucalyptus camaldulensis leaves in Burkina Faso","authors":"Ebba Rosendal, Jean Claude W. Ou edraogo, C. Dicko, E. Dey, Y. Bonzi-Coulibaly","doi":"10.5897/AJPAC2020.0837","DOIUrl":"https://doi.org/10.5897/AJPAC2020.0837","url":null,"abstract":"This study aimed to elucidate the effect of sampling location of Eucalyptus camaldulensis leaves on antioxidant activity, total phenolic content (TPC) and total flavonoid content (TFC). Leaves of E. camaldulensis collected at three different locations in Burkina Faso (north, central, south-west) were subjected to hydrodistillation to obtain a water extract and subsequent ethanol extraction of the solid residue. The extracts were analysed for antioxidant activity using 2,2-diphenyl-1-picryl-hydrazyl (DPPH) radical scavenging, TPC, TFC and high-performance thin layer chromatography (HPTLC) fingerprint. TPC were higher in water extracts and presented considerable variation from 129±9 to 266±4 milligram Gallic Acid Equivalent per gram of extract (mg GAE/g) with the highest value 266±4 mg GAE/g at the south-west site. This aqueous extract also showed high antioxidant activity with EC50 8.3 µg/mL. Furthermore, HPTLC fingerprint of the extracts showed both band intensity and size differences. For TFC, we found a slight differences within both water and ethanolic extracts with the highest value of 38.3 ±4.2 mg QE/g for the south-west ethanolic extract. The noticeable impact of climate on chemical variability of E. camaldulensis leaves needs to be taken into consideration for any further applications based on TPC biological activity of the extracts. \u0000 \u0000 Key words: Eucalyptus camaldulensis, total phenolic content, total flavonoid content, antioxidant activity, sample location, chemical variation.","PeriodicalId":7556,"journal":{"name":"African Journal of Pure and Applied Chemistry","volume":"41 1","pages":"51-59"},"PeriodicalIF":0.0,"publicationDate":"2020-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75876981","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

Health risk assessment on humans by contamination of heavy metals in some edible crops and fish at Galena mining area of Nahuta, Alkaleri Local Government Area, Bauchi State, Nigeria 尼日利亚包奇州Alkaleri地方政府区Nahuta Galena矿区某些食用作物和鱼类中重金属污染对人类健康的风险评估

African Journal of Pure and Applied Chemistry Pub Date : 2020-07-31 DOI: 10.5897/ajpac2019.0814

Y. Usman, P. Yahaya, U. Modibbo

{"title":"Health risk assessment on humans by contamination of heavy metals in some edible crops and fish at Galena mining area of Nahuta, Alkaleri Local Government Area, Bauchi State, Nigeria","authors":"Y. Usman, P. Yahaya, U. Modibbo","doi":"10.5897/ajpac2019.0814","DOIUrl":"https://doi.org/10.5897/ajpac2019.0814","url":null,"abstract":"This work investigated the human health risk effects of heavy metal contamination at Galena mining area. 10 elements were identified in both irrigated and wet season edible crops and fish were collected from five sampling locations at Galena mining area. Wet season crops held higher concentrations of heavy metals than irrigated crops. Study showed carcinogenic heavy metals Pb (1.42 E +08), Cd (1.36 E +14), Cr (1.31E – 07), As (3.92 E -06), Co (9.42E + 12), Cd (1.36 E +14) while non-carcinogenic heavy metals exposure showed assessment of health risk which indicated three major exposure pathways for people: ingestion, dermal contact and inhalation for non-carcinogenic while carcinogenic metals were exposure through ingestion and inhalation only. HI and HQ levels are < 1 indicating health risks of heavy metals in crops and fish, while carcinogenic Pb showed higher HI through ingestion by children and adults exposure. In this study, the routes of heavy metals exposure especially Pb as the major constituent element of galena was greater than 1.0 indicating higher health risks hence adequate diagnosis should be upheld in the area. \u0000 \u0000 Key words: Galena, heavy metal, carcinogenic, non-carcinogenic, health risk","PeriodicalId":7556,"journal":{"name":"African Journal of Pure and Applied Chemistry","volume":"34 1","pages":"42-50"},"PeriodicalIF":0.0,"publicationDate":"2020-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74093966","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

Evaluation of kinetics and equilibrium studies of biosorption potentials of bamboo stem biomass for removal of Lead (II) and Cadmium (II) ions from aqueous solution 竹茎生物量去除水中铅(II)和镉(II)离子的生物吸附电位的动力学评价和平衡研究

African Journal of Pure and Applied Chemistry Pub Date : 2020-05-31 DOI: 10.5897/ajpac2019.0812

J. Olayinka, Babatunde Ibigbami Tope, Oluwakayode Odeja Olubunmi, Moses Sosanolu Omoniyi

引用次数: 2

Synthesis and characterization of carboxymethyl cellulose from Musa paradisiaca and Tithonia diversifolia 天竺葵和天竺葵羧甲基纤维素的合成与表征

African Journal of Pure and Applied Chemistry Pub Date : 2020-03-31 DOI: 10.5897/AJPAC2019.0821

F. Alabi, L. Lajide, O. Ajayi, A. Adebayo, S. Emmanuel, A. Fadeyi

{"title":"Synthesis and characterization of carboxymethyl cellulose from Musa paradisiaca and \u0000Tithonia diversifolia","authors":"F. Alabi, L. Lajide, O. Ajayi, A. Adebayo, S. Emmanuel, A. Fadeyi","doi":"10.5897/AJPAC2019.0821","DOIUrl":"https://doi.org/10.5897/AJPAC2019.0821","url":null,"abstract":"Cellulose is the most abundant biomass in nature with properties that have enabled its application in different industrial processes. Its derivative, sodium carboxymethyl cellulose serves as an additive in food and non-food products such as desserts, detergents, paints etc. In this study, carboxymethyl cellulose (CMC) was synthesized from cellulose isolated from three ligno-cellulosic biomass, Tithonia diversifolia stalk (TDS), Musa parasidiaca stem (MPS) and unripe peel of Musa parasidiaca fruit (MPP). The isolation of cellulose was done by soda pulping and bleached using sodium hypochlorite, hydrogen peroxide, sodium hydroxide sequencing, followed by synthesis and purification of CMC. The physicochemical properties of the plant samples, isolated cellulose and bleached pulps including the synthesized CMC were determined. The effects of various processing stages on the properties of the cellulose and synthesized CMC were revealed in the study. CMC yield ranged from 62.57, 41.37 and 33.21% and the degree of substitution ranged from 0.33, 0.28 and 0.17 for TDS, MPS and MPP respectively. Further characterization of CMC using Fourier Transform Infrared (FTIR) confirmed the presence of major expected peaks that showed differences in terms of carboxymethyl substitution as compared to that of commercial CMC. The study revealed the potential of these plants for production of industrial grade CMC. \u0000 \u0000 Key words: Lignocellulosic biomass, cellulose, carboxymethyl cellulose, soda pulping, bleaching, etherification, Tithonia diversifolia, Musa paradisiaca.","PeriodicalId":7556,"journal":{"name":"African Journal of Pure and Applied Chemistry","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72715452","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