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Synthesis of phosphatidylcholine with (n−3) fatty acids by phospholipase A 2 in microemulsion
Author(s) -
Na An,
Eriksson Caj,
Eriksson SvenGöran,
Österberg Eva,
Holmberg Krister
Publication year - 1990
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02540488
Subject(s) - chemistry , phosphatidylcholine , lauric acid , lysophosphatidylcholine , polyunsaturated fatty acid , phospholipid , linoleic acid , stearic acid , hydrolysis , organic chemistry , microemulsion , phospholipase a2 , fatty acid , palmitic acid , transesterification , lecithin , biochemistry , chromatography , catalysis , enzyme , pulmonary surfactant , membrane
Phosphatidylcholine containing a long chain polyunsaturated acyl group at the 2‐position has been prepared by phospholipase A 2 catalyzed esterification of lysophosphatidylcholine with polyunsaturated fatty acids EPA (C20∶5) or DHA (C22∶6). Preliminary studies showed that the other fatty acids, such as lauric acid (C12), palmitic acid (C16), stearic acid (C18) and linoleic acid (C18∶2), were also incorporated. To our knowledge, phospholipase A 2 catalyzed condensation reactions have not been reported in the literature before. The reactions were performed in sodium bis (2‐ethylhexyl)‐sulfosuccinate‐based microemulsions containing small amounts of water. Synthesis of the same phospholipid by transesterification of phosphatidylcholine with the polyunsaturated acids in microemulsion failed; however, enzymatic hydrolysis to lysophosphatidylcholine was facile, quantitative conversion from phosphatidylcholine being attained after 16 hr reaction time. An additional observation was that, unlike enzymatic hydrolysis of phospholipids, the condensation reaction catalyzed by phospholipase A 2 was totally independent of the presence of calcium.