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Byung-soo Chun - One of the best experts on this subject based on the ideXlab platform.
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Effect of reaction parameters on conversion of krill (Euphausia superba) oil by immobilized lipase Ethanolysis
Journal of Industrial and Engineering Chemistry, 2014Co-Authors: Hye-youn Lee, A.s.m. Tanbirul Haque, Seon-bong Kim, Yang-bong Lee, Byung-soo ChunAbstract:Abstract Monoglyceride and diglyceride were produced by performing Ethanolysis of krill oil with immobilized lipase and the influence of various parameters on the enzymatic Ethanolysis was assessed. As an immobilized lipase, lipozyme TL-IM (thermonuces lanuginose) was used. Ethanolysis was done in non-pressurized and pressurized system to compare the reaction rate and yield. The optimal condition was found at 2.0 of ethanol mole ratio, temperature of 60 °C, lipases amount of 5 wt% in non-pressurized system. At pressurized system the optimal temperature and pressure was found at 50 °C and 10 MPa. However, at 50 °C monoglyceride was higher in pressurized system than in non-pressurized system.
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Effect of reaction rate on converted products from wheat germ oil by immobilized lipase Ethanolysis
Food Science and Biotechnology, 2013Co-Authors: A K M Asaduzzaman, Byung-soo ChunAbstract:Monoglycerides and diglycerides containing function of wheat germ oil were to produce and to assess the influence of various conditions on the Ethanolysis activities of immobilized lipases. Immobilized lipases like lipozyme ( Thermonuces lanuginose immobilized on silica gel and Rhizomucor miehei immobilized on an ion exchange resin were used for enzymatic Ethanolysis. Ethanolysis was carried out in different processes (non-pressured and pressured system) to compare the reaction rate and yield. For immobilized lipase, the optimal condition was found at 1.0 of ethanol mol ratio, temperature of 60°C, and lipases amount of 4% in non-pressured system. However, in pressured system, the optimal temperature was found at 50°C. The enzyme activity was changed depending on the enzyme source, reaction time, pressure, and temperature. Changing experimental parameters (temperature, ethanol mol ratio, enzyme amount, and reaction time) affecting wheat germ oil Ethanolysis reaction, the optimal reaction conditions were established.
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Stability of wheat germ oil obtained by supercritical carbon dioxide associated with lipase Ethanolysis
African Journal of Biotechnology, 2013Co-Authors: Jeong-eun Sim, Joo-hee Lee, Byung-soo ChunAbstract:Wheat germ oil was extracted using an environmental friendly solvent, supercritical carbon dioxide (SCCO2) at a semi-batch flow extraction process. The supercritical carbon dioxide (SC-CO2) extraction was carried out to extract oil at temperature of 40°C and pressure of 25 MPa. Ethanolysis was performed with 1,3-regiospecific lipase at different temperatures (40 to 70°C) to produce diglycerides and monoglycerides containing fatty acid ethyl esters. For determination of stability, wheat germ oil obtained by Ethanolysis reactants was characterized by measuring the acid value, peroxide value, free fatty acid contents, thiocyanate method, DPPH radical scavenging effect and rancimat test. The optimized condition of 40°C shows the highest oil stability among the various conditions. Keywords : Supercritical carbon dioxide, wheat germ oil, Ethanolysis, immobilized lipases, oil stability African Journal of Biotechnology Vol. 12(22), pp. 3570-3575
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Characteristics of menhaden oil Ethanolysis by immobilized lipase in supercritical carbon dioxide
Journal of Industrial and Engineering Chemistry, 2012Co-Authors: Sang-kyu Shin, Jeong-eun Sim, Hideki Kishimura, Byung-soo ChunAbstract:Abstract Ethanolysis of menhaden oil was performed with 1,3-regiospecific lipase to produce diglycerides and monoglycerides containing polyunsaturated fatty acids, and fatty acid ethyl esters. Immobilized lipases like lipozyme TL-IM ( Thermomuces lanuginosa immobilized on silica gel) were used for enzymatic Ethanolysis. Ethanolysis was carried out in different processes (solvent free, organic solvent and supercritical fluid system) to compare the reaction rate and yield obtained by menhaden oil Ethanolysis. Organic solvent (hexane) and supercritical carbon dioxide (SC-CO 2 ) were used as reaction medium. The reaction products were analyzed by gas chromatography (GC), thin layer chromatography (TLC) and high performance liquid chromatography (HPLC). Higher amounts of ethanol as a substrate caused substrate inhibition which dramatically decreased the reaction rate of Ethanolysis. To elucidate the effect of pressure, enzymatic Ethanolysis was performed in SC-CO 2 at pressures ranging from 75 to 121 bar. Enzymatic Ethanolysis of menhaden oil in SC-CO 2 decreased by substrate inhibition. Reaction rate and optimum amount of ethanol used were depended on SC-CO 2 density individually. Kinetic model with substrate inhibition (dead-end inhibition) by excess ethanol was set up to measure the reaction and inhibition rates.
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Characteristics of Menhaden Oil Ethanolysis by Immobilized Lipase in Supercritical Carbon Dioxide
2010Co-Authors: Sang-kyu Shin, Salim Uddin, Gordon T. Wilkinson, Byung-soo ChunAbstract:Ethanolysis of menhaden oil was performed with 1, 3-regiospecific lipase to produce diglycerides and monoglycerides containing polyunsaturated fatty acids, and fatty acid ethyl esters. Immobilized lipases like Lipozyme TL-IM (Thermomuces lanuginosa immobilized on silica gel) were used for enzymatic Ethanolysis. Ethanolysis was carried out in different processes (solvent free, organic solvent and supercritical fluid system) to compare the reaction rate and yield obtained by menhaden oil Ethanolysis. Organic solvent (hexane) and supercritical carbon dioxide (SC-CO2) were used as reaction medium. The reaction products were analyzed by GC, TLC and HPLC. Higher amounts of ethanol as a substrate caused substrate inhibition which dramatically decreased the reaction rate of Ethanolysis. To elucidate the effect of pressure, enzymatic Ethanolysis was performed in SC-CO2 at pressures ranging from 75 to 121 bar. Enzymatic Ethanolysis of menhaden oil in SC-CO2 decreased by substrate inhibition. Reaction rate and optimum amount of ethanol were depended on SC-CO2 density individually. Kinetic model with substrate inhibition (dead-end inhibition) by excess ethanol was set up to measure the reaction and inhibition rates.
Ulf Schuchardt - One of the best experts on this subject based on the ideXlab platform.
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transesterification of soybean oil catalyzed by sulfated zirconia
Bioresource Technology, 2008Co-Authors: Camila Martins Garcia, Sergio Teixeira, Leticia Ledo Marciniuk, Ulf SchuchardtAbstract:Abstract Two sulfated zirconias were synthesized and characterized by X-ray diffraction and infrared spectroscopy. They were used as catalysts in the alcoholysis of soybean oil and in the esterification of oleic acid. Using sulfated zirconia prepared by the solvent-free method (S–ZrO 2 ) as catalyst, the alcoholysis conversions of soybean oil under optimized conditions (120 °C, 1 h and 5 wt% of catalyst) were 98.6% (mEthanolysis) and 92% (Ethanolysis), respectively. The esterification of oleic acid with methanol was complete after 2 h. Zirconia sulfated by standard methods (SZ) had low activity in the mEthanolysis of soybean oil (conversion of 8.5%) and conventional zirconia (NS) was inactive for mEthanolysis under the conditions optimized for S–ZrO 2 .
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transesterification of soybean oil catalyzed by sulfated zirconia
Bioresource Technology, 2008Co-Authors: Camila Martins Garcia, Sergio Teixeira, Leticia Ledo Marciniuk, Ulf SchuchardtAbstract:Two sulfated zirconias were synthesized and characterized by X-ray diffraction and infrared spectroscopy. They were used as catalysts in the alcoholysis of soybean oil and in the esterification of oleic acid. Using sulfated zirconia prepared by the solvent-free method (S-ZrO(2)) as catalyst, the alcoholysis conversions of soybean oil under optimized conditions (120 degrees C, 1h and 5wt% of catalyst) were 98.6% (mEthanolysis) and 92% (Ethanolysis), respectively. The esterification of oleic acid with methanol was complete after 2h. Zirconia sulfated by standard methods (SZ) had low activity in the mEthanolysis of soybean oil (conversion of 8.5%) and conventional zirconia (NS) was inactive for mEthanolysis under the conditions optimized for S-ZrO(2).
Camila Martins Garcia - One of the best experts on this subject based on the ideXlab platform.
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transesterification of soybean oil catalyzed by sulfated zirconia
Bioresource Technology, 2008Co-Authors: Camila Martins Garcia, Sergio Teixeira, Leticia Ledo Marciniuk, Ulf SchuchardtAbstract:Abstract Two sulfated zirconias were synthesized and characterized by X-ray diffraction and infrared spectroscopy. They were used as catalysts in the alcoholysis of soybean oil and in the esterification of oleic acid. Using sulfated zirconia prepared by the solvent-free method (S–ZrO 2 ) as catalyst, the alcoholysis conversions of soybean oil under optimized conditions (120 °C, 1 h and 5 wt% of catalyst) were 98.6% (mEthanolysis) and 92% (Ethanolysis), respectively. The esterification of oleic acid with methanol was complete after 2 h. Zirconia sulfated by standard methods (SZ) had low activity in the mEthanolysis of soybean oil (conversion of 8.5%) and conventional zirconia (NS) was inactive for mEthanolysis under the conditions optimized for S–ZrO 2 .
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transesterification of soybean oil catalyzed by sulfated zirconia
Bioresource Technology, 2008Co-Authors: Camila Martins Garcia, Sergio Teixeira, Leticia Ledo Marciniuk, Ulf SchuchardtAbstract:Two sulfated zirconias were synthesized and characterized by X-ray diffraction and infrared spectroscopy. They were used as catalysts in the alcoholysis of soybean oil and in the esterification of oleic acid. Using sulfated zirconia prepared by the solvent-free method (S-ZrO(2)) as catalyst, the alcoholysis conversions of soybean oil under optimized conditions (120 degrees C, 1h and 5wt% of catalyst) were 98.6% (mEthanolysis) and 92% (Ethanolysis), respectively. The esterification of oleic acid with methanol was complete after 2h. Zirconia sulfated by standard methods (SZ) had low activity in the mEthanolysis of soybean oil (conversion of 8.5%) and conventional zirconia (NS) was inactive for mEthanolysis under the conditions optimized for S-ZrO(2).
Laurence Charles - One of the best experts on this subject based on the ideXlab platform.
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Insights in the Architecture of Silicon-Based Plasma Polymers Using Partial Network Ethanolysis Combined with Electrospray Tandem Mass Spectrometry
Plasma Processes and Polymers, 2013Co-Authors: Thierry Fouquet, Julien Petersen, Fabio Ziarelli, Jerôme Bour, Valerie Toniazzo, David Ruch, Laurence CharlesAbstract:Thin films obtained upon plasma polymerization of D4 and HMDSO precursors at atmospheric pressure are submitted to controlled Ethanolysis to produce oligomers amenable to electrospray mass spectrometry. When using high resolution mass spectrometry to assess their elemental composition and tandem mass spectrometry to characterize their end-groups, a whole set of Ethanolysis products is identified, from which the network connectivity in the original film can be reconstructed. Ethanolysis products of ppD4 and ppHMDSO exhibit the same structural features composed of linear and cross-linked PDMS moieties, the extent of cross-linking reflecting the inorganic character of the film. Oligomers originally embedded in the solid network and released as intact species upon its dissolution are also observed. [GRAPHICS] .
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Insights in the Architecture of Silicon‐Based Plasma Polymers Using Partial Network Ethanolysis Combined with Electrospray Tandem Mass Spectrometry
Plasma Processes and Polymers, 2013Co-Authors: Thierry Fouquet, Julien Petersen, Fabio Ziarelli, Jerôme Bour, Valerie Toniazzo, David S. Ruch, Laurence CharlesAbstract:Thin films obtained upon plasma polymerization of D4 and HMDSO precursors at atmospheric pressure are submitted to controlled Ethanolysis to produce oligomers amenable to electrospray mass spectrometry. When using high resolution mass spectrometry to assess their elemental composition and tandem mass spectrometry to characterize their end-groups, a whole set of Ethanolysis products is identified, from which the network connectivity in the original film can be reconstructed. Ethanolysis products of ppD4 and ppHMDSO exhibit the same structural features composed of linear and cross-linked PDMS moieties, the extent of cross-linking reflecting the inorganic character of the film. Oligomers originally embedded in the solid network and released as intact species upon its dissolution are also observed. [GRAPHICS] .
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Characterization of Ethanolysis products of poly(dimethylsiloxane) species by electrospray ionization tandem mass spectrometry.
Rapid communications in mass spectrometry : RCM, 2012Co-Authors: Thierry Fouquet, Jerôme Bour, Valerie Toniazzo, David S. Ruch, Laurence CharlesAbstract:RATIONALE The partial and controlled degradation of insoluble cross-linked silicon-based polymers is a promising approach to enable their characterization by mass spectrometry. Providing that the chemolysis reaction specifically proceeds at cross-linking sites, the size of linear poly(dimethylsiloxane)s (PDMS) produced during the treatment should reflect the length of linear segments between branching points in the original network. In this context, the specificity of ethanol to act as a nucleophilic agent towards tri-functional silicon atoms in a D3TDnTD3 model was evaluated. METHODS Tandem mass spectrometry (MS/MS) combined with accurate mass measurements, MS3 experiments and collision-induced dissociation of authentic compounds was used for structural characterization of D3TDnTD3 Ethanolysis products. All MS/MS data were obtained from electrosprayed ammonium adducts, previously reported to provide the most informative data for silicon-based polymers. RESULTS Since the expected Ethanolysis products were hydroxy- and ethoxy-terminated PDMS, the dissociation behavior of such polymeric species was established, using electrosprayed ammonium adducts as the precursor ions. Diagnostic product ions were identified, allowing four main D3TDnTD3 Ethanolysis products to be structurally characterized. End-group analysis of these polymeric distributions clearly indicated that Ethanolysis was mostly occurring on tri-functional silicon atoms but also, to a lesser extent, on those D atoms close to T silicons. CONCLUSIONS The size of the linear skeleton located between two tri-functional silicon atoms could be accurately determined by mass spectrometric analyses of a polymeric model submitted to Ethanolysis. This soft and rapid pre-treatment is thus a promising approach for determining the length of linear segments between branching points in the original network of cross-linked silicon-based polymers. Copyright © 2012 John Wiley & Sons, Ltd.
Leticia Ledo Marciniuk - One of the best experts on this subject based on the ideXlab platform.
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transesterification of soybean oil catalyzed by sulfated zirconia
Bioresource Technology, 2008Co-Authors: Camila Martins Garcia, Sergio Teixeira, Leticia Ledo Marciniuk, Ulf SchuchardtAbstract:Abstract Two sulfated zirconias were synthesized and characterized by X-ray diffraction and infrared spectroscopy. They were used as catalysts in the alcoholysis of soybean oil and in the esterification of oleic acid. Using sulfated zirconia prepared by the solvent-free method (S–ZrO 2 ) as catalyst, the alcoholysis conversions of soybean oil under optimized conditions (120 °C, 1 h and 5 wt% of catalyst) were 98.6% (mEthanolysis) and 92% (Ethanolysis), respectively. The esterification of oleic acid with methanol was complete after 2 h. Zirconia sulfated by standard methods (SZ) had low activity in the mEthanolysis of soybean oil (conversion of 8.5%) and conventional zirconia (NS) was inactive for mEthanolysis under the conditions optimized for S–ZrO 2 .
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transesterification of soybean oil catalyzed by sulfated zirconia
Bioresource Technology, 2008Co-Authors: Camila Martins Garcia, Sergio Teixeira, Leticia Ledo Marciniuk, Ulf SchuchardtAbstract:Two sulfated zirconias were synthesized and characterized by X-ray diffraction and infrared spectroscopy. They were used as catalysts in the alcoholysis of soybean oil and in the esterification of oleic acid. Using sulfated zirconia prepared by the solvent-free method (S-ZrO(2)) as catalyst, the alcoholysis conversions of soybean oil under optimized conditions (120 degrees C, 1h and 5wt% of catalyst) were 98.6% (mEthanolysis) and 92% (Ethanolysis), respectively. The esterification of oleic acid with methanol was complete after 2h. Zirconia sulfated by standard methods (SZ) had low activity in the mEthanolysis of soybean oil (conversion of 8.5%) and conventional zirconia (NS) was inactive for mEthanolysis under the conditions optimized for S-ZrO(2).