Different schemes in the production of structured triglycerides based on solvent-free esterification of oleic acid and palmitic acid with glycerol were evaluated in terms of reactant conversion, product composition, and yield. Two-step processes, with or without glycerol dosing, were compared with onestep versions carried out at temperature conditions within 40C–60C to a final oleic acid/palmitic acid/glycerol ratio of 2:1:1, the stoichiometric ratio in 1,3-dioleoyl-2-palmitoyl glycerol (OPO). Substantial amounts of C52 triglycerides, including OPO, were produced in all schemes at 34.98–39.55 wt.% of the total triglycerides and triglyceride yields of 50.10–56.56 wt.% based on the raw materials. The two-step process with glycerol dosing at 60C showed the highest palmitic acid incorporation at the sn-2 position of 46.46%, but the same process carried out with a step increase in temperature from 40C to 60C gave the highest OPO yield at 19.30 wt.%. These results demonstrate the possibility of manipulating regioselectivity and triglyceride specificity by varying reactant feeding schemes without the use of solvents and sn-1,3-specific lipases common in conventional acidolysis-based processes.
Tạp chí khoa học Trường Đại học Cần Thơ
Lầu 4, Nhà Điều Hành, Khu II, đường 3/2, P. Xuân Khánh, Q. Ninh Kiều, TP. Cần Thơ
Điện thoại: (0292) 3 872 157; Email: tapchidhct@ctu.edu.vn
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