Steric analysis of epoxyalcohol and trihydroxy derivatives of 9-hydroperoxy-linoleic acid from hematin and enzymatic synthesis

Thomas, Christopher P. ORCID: https://orcid.org/0000-0001-5840-8613, Boeglin, William E., Garcia-Diaz, Yoel, O'Donnell, Valerie B. and Brash, Alan R. 2013. Steric analysis of epoxyalcohol and trihydroxy derivatives of 9-hydroperoxy-linoleic acid from hematin and enzymatic synthesis. Chemistry and Physics of Lipids 167 , pp. 21-32. 10.1016/j.chemphyslip.2013.01.002

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Abstract

We characterize the allylic epoxyalcohols and their trihydroxy hydrolysis products generated from 9R- and 9S-hydroperoxy-octadecenoic acid (HPODE) under non-enzymatic conditions, reaction with hematin and subsequent acid hydrolysis, and enzymatic conditions, incubation with Beta vulgaris containing a hydroperoxide isomerase and epoxide hydrolase. The products were resolved by HPLC and the regio and stereo-chemistry of the transformations were determined through a combination of 1H NMR and GC–MS analysis of dimethoxypropane derivatives. Four trihydroxy isomers were identified upon mild acid hydrolysis of 9S,10S-trans-epoxy-11E-13S-hydroxyoctadecenoate: 9S,10R,13S, 9S,12R,13S, 9S,10S,13S and 9S,12S,13S-trihydroxy-octadecenoic acids, in the ratio 40:26:22:12. We also identified a prominent δ-ketol rearrangement product from the hydrolysis as mainly the 9-hydroxy-10E-13-oxo isomer. Short incubation (5 min) of 9R- and 9S-HPODE with B. vulgaris extract yielded the 9R- and 9S-hydroxy-10E-12R,13S-cis-epoxy products respectively. Longer incubation (60 min) gave one specific hydrolysis product via epoxide hydrolase, the 9R/S,12S,13S-trihydroxyoctadecenoate. These studies provide a practical approach for the isolation and characterization of allylic epoxy alcohol and trihydroxy products using a combination of HPLC, GC–MS and 1H NMR.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Pharmacy
Subjects:	R Medicine > RM Therapeutics. Pharmacology
Uncontrolled Keywords:	9-HPODE; Trihydroxyoctadecenoic acid; Linoleic acid; Epoxyalcohol synthase; Epoxide hydrolase; Hematin
Publisher:	Elsevier
ISSN:	0009-3084
Date of Acceptance:	6 January 2013
Last Modified:	21 Oct 2022 07:24
URI:	https://orca.cardiff.ac.uk/id/eprint/99803

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