International Review of Biophysical Chemistry最新文献_第5页

Optimization Tests of Antagonistic Interaction between Lead / Iron and Lead / Zinc, IN-VITRO Investigations on the Plant: PHASEOLUS VULGARIS 铅/铁和铅/锌拮抗相互作用的优化试验——以菜豆为研究对象

International Review of Biophysical Chemistry Pub Date : 2013-02-28 DOI: 10.15866/IREBIC.V4I1.1580

N. Sahraoui, A. Tamrabet, M. Abdedaim, F. Hamriche

引用次数: 0

The effect of process parameters on yield for zinc borate production 硼酸锌生产工艺参数对收率的影响

International Review of Biophysical Chemistry Pub Date : 2013-01-01 DOI: 10.15866/IREBIC.V4I4.1651

N. Acaralı, E. Derun, N. Tugrul, M. Piskin

{"title":"The effect of process parameters on yield for zinc borate production","authors":"N. Acaralı, E. Derun, N. Tugrul, M. Piskin","doi":"10.15866/IREBIC.V4I4.1651","DOIUrl":"https://doi.org/10.15866/IREBIC.V4I4.1651","url":null,"abstract":"The purpose of this study is to increase efficiency and to reduce costs by changing the process parameters. The synthesis of zinc borate has been carried out with the reaction of zinc oxide and boric acid. In this study, zinc borate production was carried out in aqueous media using commercial zinc borate as seed. Experiments have been carried out in an isolated glass beaker. Temperature is controlled using a digital temperature sensor and magnetic stirrer provides constantly stirring during the reaction. The experiments were performed in the presence of seed and without seed. The samples were filtered and dried at 105°C for 20 h. Dry, fine powdered zinc borate particles were produced under optimised conditions. The resulting high yield were formed utilizing various amounts of seed and high yield was obtained for saturated solution. The effect of varying the concentrations of seed, reaction time, the amount of water on yield have been investigated. As a result, zinc borate was analyzed with X-ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR) and it was observed that the synthesis was carried out successfully","PeriodicalId":14377,"journal":{"name":"International Review of Biophysical Chemistry","volume":"64 1","pages":"139-142"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85752307","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

Optimization of Cassava Starch Hydrolysis by Malt Extract, α-Amylase and Glucoamylase 麦芽提取物、α-淀粉酶和葡萄糖淀粉酶水解木薯淀粉的工艺优化

International Review of Biophysical Chemistry Pub Date : 2012-12-31 DOI: 10.15866/IREBIC.V3I6.1579

F. Aderibigbe, A. Anozie, L. Adejumo, R. Owolabi

{"title":"Optimization of Cassava Starch Hydrolysis by Malt Extract, α-Amylase and Glucoamylase","authors":"F. Aderibigbe, A. Anozie, L. Adejumo, R. Owolabi","doi":"10.15866/IREBIC.V3I6.1579","DOIUrl":"https://doi.org/10.15866/IREBIC.V3I6.1579","url":null,"abstract":"Cassava starch hydrolysis was investigated in this study using malt extract, alpha amylase and glucoamylase. The effects of process variables, namely: temperature, pH and time were studied and optimized for hydrolysis of cassava (Manihot esculenta) flour to glucose syrup. Three levels of process variables were used for the study. The three levels of process variables were: temperature (60, 67 and 74 oC), time (1.5, 2.0 and 2.5 h) and pH (4.5, 5 and 5.5). A polynomial regression model was developed using the experimental data. The results showed that production of reducing sugar was strongly affected by the variation of variables on malt extract, alpha amylase and glucoamylase hydrolysis of cassava starch. The fit of the model was expressed by the coefficient of determination R2 which was found to be 0.987 indicating that 98.7 % of the variability in the response can be explained by the model. The value also indicates that only 1.3% of the total variation is not explained by the model. This shows that equation (2) is a suitable model to describe the response of the experiment pertaining to reducing sugar production. The statistical significance of the model was validated by F-test for analysis of variance (p ≤ 0.05). For malt extract, alpha amylase and glucoamylase hydrolysis, the optimum value of temperature, time and pH were found to be 74 oC; pH 5.5 and time 1.5 h. The maximum reducing sugar production at optimum condition was 268 g/l representing 76.57 % conversion or 76.57 dextrose equivalent (DE)","PeriodicalId":14377,"journal":{"name":"International Review of Biophysical Chemistry","volume":"50 1","pages":"234-238"},"PeriodicalIF":0.0,"publicationDate":"2012-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78230821","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

Oxidative Decomposition of Pollutants of Pulp and Paper Industry Effluents: a Review 制浆造纸工业废水中污染物的氧化分解研究进展

International Review of Biophysical Chemistry Pub Date : 2012-12-31 DOI: 10.15866/IREBIC.V3I6.1575

S. Panda, U. P. Tripathy

引用次数: 0

Chemically Modified Biosorbent for Phosphorus Removal from Aqueous Solution 化学改性生物吸附剂用于去除水溶液中的磷

International Review of Biophysical Chemistry Pub Date : 2012-12-31 DOI: 10.15866/IREBIC.V3I1.1548

S. Benyoucef, M. Amrani

{"title":"Chemically Modified Biosorbent for Phosphorus Removal from Aqueous Solution","authors":"S. Benyoucef, M. Amrani","doi":"10.15866/IREBIC.V3I1.1548","DOIUrl":"https://doi.org/10.15866/IREBIC.V3I1.1548","url":null,"abstract":"In the present study, chemically modified Aleppo pine (Pinus halepensis Miller) sawdust was used for removal of phosphate from water. Biosorbent preparation process included size fractionation, extraction for surface activation, acid prehydrolysis, and treatment with urea. Sorption of phosphate ions onto biosorbent was studied using the batch technique. The effect of different parameters such as contact time, adsorbate concentration, and temperature was investigated. The adsorption kinetics data were best described by the pseudo-second-order rate equation, and equilibrium was achieved after 40 min. The Langmuir and Freundlich equations for describing adsorption equilibrium were applied to data. The constants and correlation coefficients of these isotherm models were calculated and compared. The adsorption isotherms obey the Freundlich equation. The thermodynamic parameters like free energy, enthalpy and entropy changes for the adsorption of phosphate ions have been evaluated and it has been found that the reaction was spontaneous and endothermic in nature. The low value of activated energy of adsorption, 3.088 kJ/mol, indicates that the phosphate ions are easily adsorbed on the sawdust. Results suggest that the prepared chemically modified Aleppo pine sawdust has potential in remediation of contaminated waters by phosphate","PeriodicalId":14377,"journal":{"name":"International Review of Biophysical Chemistry","volume":"3 1","pages":"8-15"},"PeriodicalIF":0.0,"publicationDate":"2012-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87359698","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

Benzohydroxamic Acid and its Applications: a Review 苯甲羟肟酸及其应用综述

International Review of Biophysical Chemistry Pub Date : 2012-12-31 DOI: 10.15866/IREBIC.V3I6.1578

R. Arora, R. Kakkar

引用次数: 5

Determining the Elemental Composition of Terminalia Brownii’s Bark Using X-Ray Fluorescence Spectrometry x射线荧光光谱法测定黄连树皮元素组成

International Review of Biophysical Chemistry Pub Date : 2012-10-31 DOI: 10.15866/IREBIC.V3I5.1571

A. Attaelmanan, H. Omar

引用次数: 0

AZ12 Based Design of PDK2 Inhibitors 基于AZ12的PDK2抑制剂设计

International Review of Biophysical Chemistry Pub Date : 2012-10-31 DOI: 10.15866/IREBIC.V3I5.1574

R. Kakkar, Neeta Azad, P. Gahlot

引用次数: 1

Modified CNBr Cleavage Protocol for Efficient Separation of Met-Ser Containing OmpX-Om14 Membrane Protein Fusion 改进的CNBr切割方案高效分离含OmpX-Om14膜蛋白融合

International Review of Biophysical Chemistry Pub Date : 2012-10-31 DOI: 10.15866/IREBIC.V3I5.1572

Ankit Gupta, Deepti Chaturvedi, R. Mahalakshmi

{"title":"Modified CNBr Cleavage Protocol for Efficient Separation of Met-Ser Containing OmpX-Om14 Membrane Protein Fusion","authors":"Ankit Gupta, Deepti Chaturvedi, R. Mahalakshmi","doi":"10.15866/IREBIC.V3I5.1572","DOIUrl":"https://doi.org/10.15866/IREBIC.V3I5.1572","url":null,"abstract":"Cleavage efficiencies of cyanogen bromide (CNBr) are drastically reduced in sequences wherein the methionine residue is succeeded by serine or threonine. Solubility issues associated especially with membrane proteins contribute further to reduced cleavage at Met-Xxx sites. Moreover, prolonged incubations of several hours to days, in highly acidic reaction conditions required for CNBr cleavage, often lead to protein degradation. To circumvent these problems, we have developed a protocol for CNBr cleavage of protein fusions, which is particularly useful for Met-Ser sequences. This protocol facilitates enhanced cleavage efficiencies in short incubation times of 1-2 hours. It incorporates up to 40% acetonitrile in 8M urea, or trace amounts of acetonitrile in 6M guanidine hydrochloride, in the final reaction. We demonstrate the successful application of this protocol for the Met-Ser containing membrane protein fusion OmpX-Om14. Cleavage of the Om14 (the yeast mitochondrial outer membrane protein) from E. coli OmpX (Outer membrane protein X) has provided yields of up to 70% product without detectable degradation levels. The direct use of the cleavage reaction for the rapid and cost-effective purification of Om14 has been shown. Using a database analysis, we discuss the importance of this protocol for several membrane proteins that have Met-Ser sequences","PeriodicalId":14377,"journal":{"name":"International Review of Biophysical Chemistry","volume":"106 1","pages":"147-156"},"PeriodicalIF":0.0,"publicationDate":"2012-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76133232","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: 3

Thermodynamic Modeling of PES/CA Blend Membrane Preparation PES/CA共混膜制备的热力学模型

International Review of Biophysical Chemistry Pub Date : 2012-10-31 DOI: 10.15866/IREBIC.V3I5.1569

H. Abdallah, S. S. Ali

{"title":"Thermodynamic Modeling of PES/CA Blend Membrane Preparation","authors":"H. Abdallah, S. S. Ali","doi":"10.15866/IREBIC.V3I5.1569","DOIUrl":"https://doi.org/10.15866/IREBIC.V3I5.1569","url":null,"abstract":"Thermodynamic behavior of quaternary system with one low molecular weight component; N –Methylpyrrolidone (NMP) as a solvent, non-solvent; polyethylene glycol (PEG 400) and two high molecular weight polymers; polyethersulfone (PES) and cellulose acetate (CA) was investigated. An extended modified Flory-Huggins model was used. The predicted results from model of critical temperature for superiority properties of polymer blend solution were in range between UCST 323 K and LCST 350 K. However, the increasing the vaporization time of PES/CA blend membrane to 30 min has increased the heat of vaporization to 133659.6 J/mole which led to increase in cohesive energy density to 1311.82 J/cm3 and gained more solvent evaporation. The diffusion model was studied on the immersion precipitation process which was indicated that solvent and non-solvent volume fractions increased with time in the coagulation bath , while the polymer solution volume fraction decreased due to solvent and non-solvent removal from polymer solution and blend membrane formation. The predicted results from model of heat treatment process on blend membrane were indicated that increasing in membrane thickness and formation of dense layer in blend membrane","PeriodicalId":14377,"journal":{"name":"International Review of Biophysical Chemistry","volume":"19 1","pages":"125-135"},"PeriodicalIF":0.0,"publicationDate":"2012-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78389461","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: 6