title: Lipase-catalysed interesterification between canola oil and fully hydrogenated canola oil in contact with supercritical carbon dioxide.
abstract: The processing parameters in enzymatic reactions using CO2-expanded (CX) lipids have strong effects on the physical properties of liquid phase, degree of interesterification, and physicochemical properties of the final reaction products. CX-canola oil and fully hydrogenated canola oil (FHCO) were interesterified using Lipozyme TL IM in a high pressure stirred batch reactor. The effects of immobilised enzyme load, pressure, substrate ratio and reaction time on the formation of mixed triacylglycerols (TG) from trisaturated and triunsaturated TG were investigated. The optimal immobilised enzyme load, pressure, substrate ratio and time for the degree of interesterification to reach the highest equilibrium state were 6% (w/v) of initial substrates, 10 MPa, blend with 30% (w/w) of FHCO and 2h, respectively. The physicochemical properties of the initial blend and interesterified products with different FHCO ratios obtained at optimal reaction conditions were determined in terms of TG composition, thermal behaviour and solid fat content (SFC). The amounts of saturated and triunsaturated TG decreased while the amounts of mixed TG increased as a result of interesterification. Thus, the interesterified product had a lower melting point, and broader melting and plasticity ranges compared to the initial blends. These findings are important for better understanding of CX-lipid reactions and for optimal formulation of base-stocks of margarine and confectionary fats to meet industry demands.
authors.affiliation: Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada T6G 2P5.
authors.forename: Ehsan
authors.initials: E
authors.lastname: Jenab
authors.forename: Feral
authors.initials: F
authors.lastname: Temelli
authors.forename: Jonathan M
authors.initials: JM
authors.lastname: Curtis
mesh_terms: D002245:Carbon Dioxide / Q000737:chemistry*; D002384:Catalysis; D004951:Esterification; D005229:Fatty Acids, Monounsaturated / Q000737:chemistry*; D006358:Hot Temperature; D006865:Hydrogenation; D008049:Lipase / Q000737:chemistry*; D010938:Plant Oils / Q000737:chemistry; D000074262:Rapeseed Oil
chemical_list: D005229:Fatty Acids, Monounsaturated; D010938:Plant Oils; D000074262:Rapeseed Oil; D002245:Carbon Dioxide; C093666:Lipozyme; D008049:Lipase
keywords: Canola oil; Fully hydrogenated canola oil; Interesterification; Lipozyme TL IM; Melting behaviour; Solid fat content; Supercritical carbon dioxide