The Experts below are selected from a list of 2040 Experts worldwide ranked by ideXlab platform
Hanna Nosal - One of the best experts on this subject based on the ideXlab platform.
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Synthesis and characterization of alkyd resins based on Camelina sativa oil, glycerol and selected epoxidized vegetable oils as functional modifiers
Progress in Organic Coatings, 2016Co-Authors: Hanna Nosal, Marek Warza??a, Janusz Nowicki, Izabela Semeniuk, Ewa SaburaAbstract:Novel alkyd resins based on the Camelina sativa oil as a new renewable raw material and glycerol as a polyol component were synthesized. Selected epoxidized vegetable oils (linseed oil and camelina oil) as new functional modifiers were used in the Alcoholysis Reaction with purified camelina oil. The influence of the added epoxidized linseed oil and epoxidized camelina oil on the course of alkyd resin synthesis and the properties of the final products were investigated. The glycerol-based alkyd resins with improved properties were produced.
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Synthesis and characterization of alkyd resins based on Camelina sativa oil and polyglycerol
Progress in Organic Coatings, 2015Co-Authors: Hanna Nosal, Marek WarzaÅa, Janusz Nowicki, Ewa Nowakowska-bogdan, Magdalena ZarÄbskaAbstract:A one pot synthesis of alkyd resins based on the Camelina sativa oil as a new renewable raw material and on polyglycerols as polyols was carried out. The oligomerization of glycerol was conducted in the presence of LiOH (0.1wt%) at 245°C. The total content of diglycerol reached its maximum (about 33.5wt%) after 7h. The oligomerization product with no additional treatment was subjected to the Alcoholysis Reaction with purified camelina oil. The alkyd resin was obtained after polycondensation of the Alcoholysis products with phthalic and maleic anhydrides at 230–250°C. A real possibility was determined for the synthesis of alkyd resins with some properties similar to those which can be found in equivalent products manufactured on the basis of semi drying oil and pentaerythritol like flexibility and drying time.
Magdalena ZarÄbska - One of the best experts on this subject based on the ideXlab platform.
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Synthesis and characterization of alkyd resins based on Camelina sativa oil and polyglycerol
Progress in Organic Coatings, 2015Co-Authors: Hanna Nosal, Marek WarzaÅa, Janusz Nowicki, Ewa Nowakowska-bogdan, Magdalena ZarÄbskaAbstract:A one pot synthesis of alkyd resins based on the Camelina sativa oil as a new renewable raw material and on polyglycerols as polyols was carried out. The oligomerization of glycerol was conducted in the presence of LiOH (0.1wt%) at 245°C. The total content of diglycerol reached its maximum (about 33.5wt%) after 7h. The oligomerization product with no additional treatment was subjected to the Alcoholysis Reaction with purified camelina oil. The alkyd resin was obtained after polycondensation of the Alcoholysis products with phthalic and maleic anhydrides at 230–250°C. A real possibility was determined for the synthesis of alkyd resins with some properties similar to those which can be found in equivalent products manufactured on the basis of semi drying oil and pentaerythritol like flexibility and drying time.
Janusz Nowicki - One of the best experts on this subject based on the ideXlab platform.
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Synthesis and characterization of alkyd resins based on Camelina sativa oil, glycerol and selected epoxidized vegetable oils as functional modifiers
Progress in Organic Coatings, 2016Co-Authors: Hanna Nosal, Marek Warza??a, Janusz Nowicki, Izabela Semeniuk, Ewa SaburaAbstract:Novel alkyd resins based on the Camelina sativa oil as a new renewable raw material and glycerol as a polyol component were synthesized. Selected epoxidized vegetable oils (linseed oil and camelina oil) as new functional modifiers were used in the Alcoholysis Reaction with purified camelina oil. The influence of the added epoxidized linseed oil and epoxidized camelina oil on the course of alkyd resin synthesis and the properties of the final products were investigated. The glycerol-based alkyd resins with improved properties were produced.
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Synthesis and characterization of alkyd resins based on Camelina sativa oil and polyglycerol
Progress in Organic Coatings, 2015Co-Authors: Hanna Nosal, Marek WarzaÅa, Janusz Nowicki, Ewa Nowakowska-bogdan, Magdalena ZarÄbskaAbstract:A one pot synthesis of alkyd resins based on the Camelina sativa oil as a new renewable raw material and on polyglycerols as polyols was carried out. The oligomerization of glycerol was conducted in the presence of LiOH (0.1wt%) at 245°C. The total content of diglycerol reached its maximum (about 33.5wt%) after 7h. The oligomerization product with no additional treatment was subjected to the Alcoholysis Reaction with purified camelina oil. The alkyd resin was obtained after polycondensation of the Alcoholysis products with phthalic and maleic anhydrides at 230–250°C. A real possibility was determined for the synthesis of alkyd resins with some properties similar to those which can be found in equivalent products manufactured on the basis of semi drying oil and pentaerythritol like flexibility and drying time.
Alfonso Robles - One of the best experts on this subject based on the ideXlab platform.
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synthesis of 2 monoacylglycerols and structured triacylglycerols rich in polyunsaturated fatty acids by enzyme catalyzed Reactions
Enzyme and Microbial Technology, 2012Co-Authors: A Rodriguez, Luis Esteban, L Martin, Maria J Jimenez, Estrella Hita, Beatriz Castillo, Pedro A Gonzalez, Alfonso RoblesAbstract:Abstract This paper studies the synthesis of structured triacylglycerols (STAGs) by a four-step process: (i) obtaining 2-monoacylglycerols (2-MAGs) by Alcoholysis of cod liver oil with several alcohols, catalyzed by lipases Novozym 435, from Candida antartica and DF, from Rhizopus oryzae, (ii) purification of 2-MAGs, (iii) formation of STAGs by esterification of 2-MAGs with caprylic acid catalyzed by lipase DF, from R. oryzae, and (iv) purification of these STAGs. For the Alcoholysis of cod liver oil, absolute ethanol, ethanol 96% (v/v) and 1-butanol were compared; the conditions with ethanol 96% were then optimized and 2-MAG yields of around 54–57% were attained using Novozym 435. In these 2-MAGs, DHA accounted for 24–31% of total fatty acids. In the operational conditions this lipase maintained a stable level of activity over at least 11 uses. These results were compared with those obtained with lipase DF, which deactivated after only three uses. The Alcoholysis of cod liver oil and ethanol 96% catalyzed by Novozym 435 was scaled up by multiplying the reactant amounts 100-fold and maintaining the intensity of treatment constant (IOT = 3 g lipase h/g oil). In these conditions, the 2-MAG yield attained was about 67%; these 2-MAGs contained 36.6% DHA. The synthesized 2-MAGs were separated and purified from the Alcoholysis Reaction products by solvent extraction using solvents of low toxicity (ethanol and hexane); 2-MAG recovery yield and purity of the target product were approximately 96.4% and 83.9%, respectively. These 2-MAGs were transformed to STAGs using the optimal conditions obtained in a previous work. After synthesis and purification, 93% pure STAGs were obtained, containing 38% DHA at sn-2 position and 60% caprylic acid (CA) at sn-1,3 positions (of total fatty acids at these positions), i.e. the major TAG is the STAG with the structure CA-DHA-CA.
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synthesis of structured lipids by two enzymatic steps ethanolysis of fish oils and esterification of 2 monoacylglycerols
Process Biochemistry, 2009Co-Authors: M M Munio, Luis Esteban, Pedro A Gonzalez, Alfonso Robles, Emilio MolinaAbstract:Abstract This paper studies the synthesis of structured triacylglycerols (STAGs), rich in polyunsaturated fatty acids (PUFAs) by a two-step enzymatic process: (i) Alcoholysis of fish oils (cod liver and tuna oils) with ethanol to obtain 2-monoacylglycerols (2-MAGs), catalyzed by 1,3 specific lipases and (ii) esterification of these 2-MAGs with caprylic acid (CA, 8:0), also catalyzed by a 1,3 specific lipase, to produce STAGs of structure CA–PUFA–CA. As regards the Alcoholysis Reaction, three factors have been studied: the influence of the type of lipase used (lipase D from Rhizopus oryzae, immobilized on Accurel MP1000, and Novozym 435 from Candida antarctica), the operational mode of a stirred tank reactor (STR operating in discontinuous and continuous mode) and the intensity of treatment (IOT = lipase amount × Reaction time/oil amount). Although higher 2-MAG yields were obtained with lipase D, Novozym 435 was selected due to its greater stability in the operational conditions. The highest 2-MAG yield (63%) was attained in the STR operating in discontinuous mode at an IOT of 1 g lipase × h g oil−1 (at higher IOT the 2-MAGs were degraded to glycerol). This system was scaled up to 100 times the initial volume, achieving a similar yield (65%) at the same IOT. The 2-MAGs in the final Alcoholysis Reaction mixture were separated from ethyl esters by solvent extraction using solvents of low toxicity (ethanol and hexane); the 2-MAG recovery yield was over 90% and the purity was approximately 87–90%. Regarding the esterification of the 2-MAGs, the following factors were studied: the influence of the lipase type used, the presence or absence of solvent (hexane) and the Reaction time or intensity of treatment (IOT = lipase amount × Reaction time/2-MAG amount). Of the five lipases tested, the highest STAG percentages (over 90%) were attained with lipases D and DF, immobilized on Accurel MP1000. These STAGs contain 64% CA, of which 98% is at positions 1 and 3. Position 2 contains 5% CA and 45% PUFAs, which means that all the PUFAs that were located at position 2 in the original oil remain in that position in the final STAGs. The lipase D immobilized on Accurel MP1000 is stable in the operational conditions used in the esterification Reaction. Finally the purification of STAGs was carried out by neutralization of free fatty acids with hydroethanolic solution of KOH and extraction of STAGs with hexane. By this method purity was over 95% and separation yields were about 80%.
Ewa Sabura - One of the best experts on this subject based on the ideXlab platform.
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Synthesis and characterization of alkyd resins based on Camelina sativa oil, glycerol and selected epoxidized vegetable oils as functional modifiers
Progress in Organic Coatings, 2016Co-Authors: Hanna Nosal, Marek Warza??a, Janusz Nowicki, Izabela Semeniuk, Ewa SaburaAbstract:Novel alkyd resins based on the Camelina sativa oil as a new renewable raw material and glycerol as a polyol component were synthesized. Selected epoxidized vegetable oils (linseed oil and camelina oil) as new functional modifiers were used in the Alcoholysis Reaction with purified camelina oil. The influence of the added epoxidized linseed oil and epoxidized camelina oil on the course of alkyd resin synthesis and the properties of the final products were investigated. The glycerol-based alkyd resins with improved properties were produced.