title: Enzymatic preparation of structured oils containing short-chain fatty acids.
abstract: Structured oils prepared by enzymatic transacylation with triacylglycerols (TAGs) and various fatty acids (FAs) were characterized. Transacylation with trilaurin and saturated FAs (C4:0-C16:0) was performed using Lipozyme RM-IM under standard reaction conditions. The structured oils thus produced had transacylation ratios of 25-37%, as medium-chain FAs > long-chain FAs > short-chain FAs. This result confirmed that short-chain FAs have little reactivity in enzymatic transacylation. All prepared oils shared the same composition of TAG molecular species, as demonstrated by HPLC analysis, and contained a mixture of mono-substituted, di-substituted, and non-substituted TAGs. The reaction conditions for transacylation with TAGs and short-chain FAs were optimized to improve transacylation ratios. The introduction ratios of C4:0, C5:0, and C6:0 into trilaurin were increased to 52.4, 42.5, and 34.1%, respectively, by extending the reaction time. Transacylation between TAGs and short-chain FAs was further examined by using Lipase PL. C4:0 was introduced at 51.1%, the same ratio as for Lipozyme RM-IM. When C5:0 and C6:0 were used as the FA substrate, the transacylation ratios obtained were 47.7 and 43.4%, respectively, higher than those for Lipase RM-IM. Lipase PL is therefore useful for introducing short-chain FAs into TAGs.
authors.affiliation: Department of Materials and Life Science, Faculty of Science and Technology, Seikei University. akanda@st.seikei.ac.jp
authors.forename: Ayato
authors.initials: A
authors.lastname: Kanda
authors.forename: Fusako
authors.initials: F
authors.lastname: Namiki
authors.forename: Setsuko
authors.initials: S
authors.lastname: Hara
mesh_terms: D005227:Fatty Acids / Q000737:chemistry* / Q000378:metabolism*; D008049:Lipase / Q000378:metabolism*; D012450:Safflower Oil / Q000737:chemistry / Q000378:metabolism; D014280:Triglycerides / Q000737:chemistry* / Q000378:metabolism*
chemical_list: D005227:Fatty Acids; D014280:Triglycerides; D012450:Safflower Oil; C093666:Lipozyme; D008049:Lipase