dehydroascorbic acid
oxidized vitamin C

the reversibly oxidized form of ascorbic acid. it is the lactone of 2,3-diketogulonic acid and has antiscorbutic activity in man on oral ingestion. Widespread in plants, as oxidn. prod. of Ascorbic acid BWR05-S. Formed reversibly in vivo from ascorbic acid and shows similar vitamin function Dehydroascorbic acid (DHA) is an oxidized form of ascorbic acid. It is actively imported into the endoplasmic reticulum of cells and generates the oxidative potential found there. Protein disulfide isomerases are known to reduce DHA back to ascorbic acid, oxidizing their disulfide bonds in the process. Therefore L-dehydroascorbic acid is a vitamin C compound much like L-ascorbic acid. Oxidized forms of esterified ascorbic acids can be numbered at C(5) or C(6) atoms and the (free) chemical radical semi-dehydroascorbate or semidehydro ascorbic acid (SDA) to the group of dehydroascorbic acids.; Dehydroascorbic acid is the oxidized form of vitamin C. Reduced Vitamin C concentrations in the brain exceed those in blood by 10 fold. Dehydroascorbic acid readily enters the brain and is retained in the brain tissue in the form of ascorbic acid (ascorbic acid is not able to cross the blood-brain barrier).; Therefore, transport of dehydroascorbic acid by the Glucose Transporter 1 (GLUT1, Glucose transporters are integral membrane glycoproteins involved in transporting glucose into most cells. GLUT1 is a major glucose transporter in the mammalian blood-brain barrier. It is present at high levels in primate erythrocytes and brain endothelial cells.) is a mechanism by which the brain acquires vitamin C. (OMIM 138140); Vitamin C does not pass from the blood stream into the brain, although the brain is one of the organs which has the greatest concentration of vitamin C. Instead it is dehydroascorbate that is transported through the blood-brain barrier via GLUT1 transporters, and then converted to vitamin C. Some research has suggested that administration of dehydroascorbic acid may confer protection from neuronal injury following an ischemic stroke.