title: Effect of omeprazole on ascorbate free radical formation.
abstract: In order to study the effect of omeprazole on the K/[H+] value of ascorbic acid (K = the ascorbic acid-ascorbic free radical equilibrium constant), changes of the concentration of ascorbate free radical in guinea pig sera were examined after intraperitoneal administration of omeprazole. Furthermore, to see the in vitro effect of omeprazole on ascorbate free radical, changes were examined in ascorbate solutions after addition of omeprazole. It was found that the K/[H+] value in the serum increased significantly after administration of omeprazole and also that the drug amplified the electron spin resonance (ESR) signal intensity of ascorbate free radical in vitro. These results suggested that omeprazole acts like oxygen radicals.
authors.affiliation: Department of Internal Gastroenterology, Sendai Shakai Hoken Hospital.
authors.forename: T
authors.initials: T
authors.lastname: Ohara
authors.forename: R
authors.initials: R
authors.lastname: Sasaki
authors.forename: D
authors.initials: D
authors.lastname: Shibuya
authors.forename: S
authors.initials: S
authors.lastname: Asaki
authors.forename: T
authors.initials: T
authors.lastname: Toyota
mesh_terms: D000818:Animals; D001205:Ascorbic Acid / Q000378:metabolism*; D004578:Electron Spin Resonance Spectroscopy; D005609:Free Radicals / Q000378:metabolism; D006168:Guinea Pigs; D008297:Male; D009853:Omeprazole / Q000494:pharmacology*; D010084:Oxidation-Reduction
chemical_list: D005609:Free Radicals; D009853:Omeprazole; D001205:Ascorbic Acid