title: Ascorbyl free radical release in diabetic patients.
abstract: The objective of this study was to verify the presence of oxidative stress in type 1 and type 2 diabetic patients and to provide evidences for an use of ascorbyl free radical (AFR)/vitamin C ratios as tools exploring the level of oxidative stress in diabetic patients. TBARS levels, oxygen-radical absorbing capacity assay and AFR release assessed by electron paramagnetic resonance (EPR) were used to explore the existence of oxidative stress in diabetes. Endogenous antioxidants (alpha-tocopherol, vitamin C and uric acid) were also measured. Scavenging capacities of plasma were decreased in diabetic patients. A significant decrease of plasma vitamin C and an increase of AFR/vitamin C ratios were noted in type 2 diabetic patients. Uricemia was decreased in type 1 diabetic patients. Our results suggest a possible use of AFR/vitamin C ratios as indicators of oxidative stress in diabetes mellitus.
authors.affiliation: Facultés de Médecine et de Pharmacie, Dijon, France. carol.masuyer@wanadoo.fr
authors.forename: C
authors.initials: C
authors.lastname: Courderot-Masuyer
authors.forename: J J
authors.initials: JJ
authors.lastname: Lahet
authors.forename: B
authors.initials: B
authors.lastname: Verges
authors.forename: J M
authors.initials: JM
authors.lastname: Brun
authors.forename: L
authors.initials: L
authors.lastname: Rochette
mesh_terms: D000975:Antioxidants / Q000378:metabolism; D001205:Ascorbic Acid / Q000097:blood*; D002784:Cholesterol / Q000097:blood; D008076:Cholesterol, HDL / Q000097:blood; D008078:Cholesterol, LDL / Q000097:blood; D003922:Diabetes Mellitus, Type 1 / Q000097:blood*; D003924:Diabetes Mellitus, Type 2 / Q000097:blood*; D004578:Electron Spin Resonance Spectroscopy; D005260:Female; D005609:Free Radicals / Q000097:blood*; D006801:Humans; D015227:Lipid Peroxidation; D008297:Male; D018384:Oxidative Stress; D013053:Spectrophotometry; D017392:Thiobarbituric Acid Reactive Substances; D014280:Triglycerides / Q000097:blood; D014527:Uric Acid / Q000097:blood; D014810:Vitamin E / Q000097:blood
chemical_list: D000975:Antioxidants; D008076:Cholesterol, HDL; D008078:Cholesterol, LDL; D005609:Free Radicals; D017392:Thiobarbituric Acid Reactive Substances; D014280:Triglycerides; D014810:Vitamin E; D014527:Uric Acid; D002784:Cholesterol; D001205:Ascorbic Acid