Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 175 for “"organic solvent"”.
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MEMBRANE DEVELOPMENT FOR ORGANIC SOLVENT NANOFILTRATION APPLICATION
Organic solvent nanofiltration (OSN) is a straightforward yet effective membrane-based molecular separation technology with significant applicability in food, pharmaceutical, and petrochemical industries. This thesis tends to cover different methods for the fabrication and modification of polyimide …
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Parameters influencing yeast-mediated reactions in an organic solvent
The yeast-mediated reduction of a series of 3-oxobutanoate esters (methyl, ethyl, isopropyl, butyl, sec-hutyl, tert-hutyl and benzyl) was performed in petroleum ether at room temperature over a 24h period. The procedure was shown to be a simple and effective method for the stereoselective …
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The yeast mediated synthesis of the l-ephedrine precursor, l-phenylacetylcarbinol, in an organic solvent
… performing the reaction with dried yeast in an organic solvent.
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THE USE OF EXPANDED ENSEMBLE FOR THE PREDICTION OF WATER-ORGANIC SOLVENT PARTITION COEFFICIENTS OF SMALL DRUG-LIKE MOLECULES
… coefficient (logP) between water and a nonpolarsolvent is commonly used to characterize a molecule’s hydrophobicity. This metric serves as a key predictor of lipophilicity and membrane permeability— critical factors in determining a molecule’s bioavailability. As a result, accurate prediction of …
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Analysis of Organic Pollutants by Micro Scale Liquid-Liquid Extraction and On-column Large Volume Injection Gas Chromatography
The analysis of organic pollutants in water is traditionally done following EPA procedures which commonly use liquid-liquid extraction. One liter of water is extracted three times with 60 mL of an organic solvent. The extract is concentrated and analyzed by gas chromatography. This procedure is …
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The calcinogenic principles of Trisetum flavescens
… nature of the toxic substance or substances. An organic soluble substance was extracted and purified and shown to promote intestinal phosphate transport and increase plasma phosphate levels. This factor was shown to influence the movement of phosphate from the serosa to the bloodstream but not …
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Uniform biodegradable microparticle systems for protein delivery
… Different PLG and PLA molecular weight and organic solvent combination to dissolve core and shell polymers (organic solvent configuration) were used to produce uniform DWMS with average size around 55 µm and ~10 µm shell thickness. By studying the in vitro release profiles, intraparticle …
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The alkaline hydrolysis of esters in aqueous-organic solvent mixtures. The effects of solvents and of the activity coefficients of reactants on the kinetics of the alkaline hydrolysis of methyl acetate in aqueous dioxan, aqueous dimethyl sulphoxide and aqueous diglyme (bis (2-methoxyethyl ) ether) mixtures as solvents.
… hydrolysis of methyl acetate in various aqueous-organic solvent mixtures (dimethyl sulfoxide 0<x40.2, dioxane 0 <, x., < 0.2, methyl ethyl ketone 0<x<0.06 and diglyme, i. e. ether-bis (2-methyloxethyl) 0x<0.10) have been determined for the temperatures 15 0 C, 25 0C and 35 0C conductometrically. …
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Supercritical Fluid Extraction of Nylon 6,6 Fiber Finish and Oligomers
… of the finish has traditionally been done with solvents such as chloroform or Freon followed by gravimetric or spectroscopic analysis of the removed material. Quantitation of low molecular weight oligomeric material is another important quality control practice for the fiber industry in that the …
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Novel near-infrared absorbing dyes
… The first dyes of this type possessed poor organic solvent solubilities but, through modification of the 2,2-substituents of the dihydroperimidines it was possible to obtain squarylium dyes with good organic solvent solubility, this being a much sought after property of infrared dyes. Other …
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Novel continuous crystallization configurations for improved yield, purity and controlled crystal size distribution
… (3) the combination of impurity complexation and organic solvent nanofiltration to remove the impurity that has similar molecular weight and structure to the active pharmaceutical ingredient (API). For the first two approaches, continuous crystallization processes of cyclosporine were developed. …
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Analysis of Alcohol and Alkylphenol Polyethers via Packed Column Supercritical Fluid Chromatography
… of APEOs and consumed a smaller amount of organic solvent. AEOs and APOs lack functionality capable of absorbing UV light outside the UV cut-off of normal organic solvents. SFC was able to separate AEOs and APOs derivatized as trimethylsilyl ethers (TMS) with pure CO2 with detection at 195 …
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Environmentally Benign Extraction Processes in Analytical Separation of Essential Oils
… bodies aimed at reducing the wide-scale use of organic solvents due to negative environmental impacts. Supercritical carbon dioxide (SC-CO2) is considered to be environmentally benign and has been used in the development of a wide-range of alternative processes in various industries to totally …
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DEVELOPMENT OF ELECTRO-ENHANCED MICROEXTRACTION TECHNIQUES
… WAS OPTIMIZED VIA THE VARIOUS PARAMETERS SUCH AS ORGANIC SOLVENT FOR SLM, INFLUENCE OF PH IN THE DONOR AND ACCEPTOR SOLUTIONS, THE DURATION OF EXTRACTION TIME, THE ADJUSTMENT OF FLOW RATE AND THE APPLICATION OF VOLTAGE INTENSITY. EVENTUALLY, THE DEVELOPED TECHNIQUES WERE COMPARED WITH CONVENTIONAL …
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Investigation of Novel Electrolytes for Use in Lithium-Ion Batteries and Direct Methanol Fuel Cells
… due to their potential as a safer alternative to organic solvent-based electrolytes in lithium-ion batteries and composite sulfonated polyetheretherketone (sPEEK) membranes have been investigated for their potential use as a proton exchange membrane electrolyte in direct methanol fuel cells. The …
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Magneto-Optical Study of Cobalt Ferrite Nanoparticles
… or amine head group and suspended in a non-polar organic solvent. As a complete structural analysis of this series of samples is quite difficult due to the similarities of the constituents, magneto-optical spectroscopy is performed to decode the structural orientations of each cation involved. …
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Design & Fabrication of Super-Hydrophobic Surfaces by Laser Micro/Nanoprocessing
… textured metal samples by immersion inside an organic solvent Isopropanol Alcohol.
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DEVELOPMENT AND APPLICATION OF MINIATURIZED SAMPLE PREPARATION TECHNIQUES COMBINED WITH GAS CHROMATOGRAPHY-MASS SPECTROMETRY IN ENVIRONMENTAL ANALYSIS
… acid-etched stainless steel plunger was used as organic solvent holder and support. The aforementioned miniaturized and environmentally friendly sample preparation methods were demonstrated to be simple, fast and cost-effective for the analysis of organic pollutants from environmental aqueous …
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