caa a22 4500 465766498 CHVBK 20180323111915.0 cr unu---uuuuu 170327e19900801xx s 000 0 eng 10.1007/BF02538092 doi (NATIONALLICENCE)springer-10.1007/BF02538092 VanRollins Mike Hypertension Research Division, Henry Ford Hospital, 2799 West Grand Boulevard, 48202, Detroit, Michigan aut Synthesis and characterization of cytochrome P-450 epoxygenase metabolites of eicosapentaenoic acid [Elektronische Daten] [Mike VanRollins] Eicosapentaenoic acid, a major component of fish oil extracts, was recently shown to be metabolized to vicinal diol regioisomers by renal and hepatic cytochrome P-450 epoxygenases. The diol products were also found in the urine of people ingesting fish oil. In the present report, we developed a chemical method of making milligram amounts of the epoxide intermediates and their diol products. Eicosapentaenoic acid was reacted with 0.1 eq.m-chloroperoxybenzoic acid for 15 min. After normal- and reverse-phase high performance liquid chromatography plus capillary gas chromatography and electron impact mass spectrometry, the products were identified as 17,18-cis-epoxyeicosa-5,8,11,14-tetraenoic, 14,15-cis-epoxy-eicosa-5,8,11,17-tetraenoic, 11,12-cis-epoxy-eicosa-5,8,14,17-tetraenoic, 8,9-cis-epoxy-eicosa-5,11,14,17-tetraenoic and 5,6-cis-epoxy-eicosa-8,11,14,17-tetraenoic acids. The total epoxide yield from eicosapentaenoate was 10% per incubation. By reincubating (cycling) the unused substrate 10-20 times, the total epoxide yield could be increased to 66-88%. Epoxide regioisomers were not produced in equal amounts; epoxygenation was facilitated as the distance between the target double bond and carbomethoxy group increased. Upon hydrolyzing the epoxides, the gas-chromatographic retention times and mass spectra of the diol products were found to match those of biological metabolites. In addition, each of these standards was rapidly and quantitatively synthesized in an amount (milligram) adequate for biological tests. American Oil Chemists' Society (AOCS), 1990 Lipids Springer-Verlag 25/8(1990-08-01), 481-490 0024-4201 25:8<481 1990 25 11745 https://doi.org/10.1007/BF02538092 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02538092 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- VanRollins Mike Hypertension Research Division, Henry Ford Hospital, 2799 West Grand Boulevard, 48202, Detroit, Michigan aut NATIONALLICENCE 773 0- Lipids Springer-Verlag 25/8(1990-08-01), 481-490 0024-4201 25:8<481 1990 25 11745 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer