title: Production of medium-chain triacylglycerols from corn oil: optimization by response surface methodology.
abstract: Structured lipids (SLs) having long-chain fatty acids at sn-2 and medium-chain caprylic acid (CA, 8:0) at their sn-1,3-positions from corn oil (CO) were obtained and optimized by response surface methodology (RSM) with a three-level, three-factor face-centered cube design. Compositions of triacylglycerol species (TAGs) in SLs were also investigated by reverse-phase high performance liquid chromatography. Lipozyme TL IM from Thermomyces lanuginosa was used for the acidolysis of CO with CA in n-hexane. The effects of substrate molar ratio, enzyme amount, and reaction time on CA incorporation into CO were optimized. The optimum conditions were 13.2% (wt.) enzyme, 3.9:1 caprylic acid/corn oil molar ratio, and 3.1 h reaction time. At optimum conditions, 21.5 +/- 0.8 mol.% caprylic acid containing SLs was obtained. This product was characterized by 50% of triacylglycerol species with equivalent carbon number (ECN) C30, C32, C36, and C38, and 50% of triacylglycerol species with ECN C42, C44, and C46.
authors.affiliation: Istanbul Technical University, Institute of Science and Technology, Istanbul, Turkey.
authors.forename: Tarik
authors.initials: T
authors.lastname: Oztürk
authors.forename: Guldem
authors.initials: G
authors.lastname: Ustun
authors.forename: H Ayse
authors.initials: HA
authors.lastname: Aksoy
mesh_terms: D001709:Biotechnology / Q000379:methods*; D002210:Caprylates / Q000737:chemistry; D003314:Corn Oil / Q000378:metabolism*; D005227:Fatty Acids / Q000032:analysis; D006868:Hydrolysis; D008049:Lipase / Q000378:metabolism; D008956:Models, Chemical; D012044:Regression Analysis; D015203:Reproducibility of Results; D013997:Time Factors; D014280:Triglycerides / Q000096:biosynthesis*
chemical_list: D002210:Caprylates; D005227:Fatty Acids; D014280:Triglycerides; D003314:Corn Oil; D008049:Lipase; C031492:octanoic acid