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Dehydroascorbic acid (DHA) is an oxidized form of ascorbic acid (vitamin C). It is actively imported into the endoplasmic reticulum of cells via glucose transporters. [1] It is trapped therein by reduction back to ascorbic acid by glutathione and other thiols. [2] The (free) chemical radical semidehydroascorbic acid (SDA) also belongs to the ...
The name "vitamin C" always refers to the l-enantiomer of ascorbic acid and its oxidized form, dehydroascorbate (DHA). Therefore, unless written otherwise, "ascorbate" and "ascorbic acid" refer in the nutritional literature to l-ascorbate and l-ascorbic acid respectively.
The three substrates of the enzyme are dopamine, vitamin C (ascorbate), and O 2. The products are norepinephrine, dehydroascorbate, and H 2 O. DBH is a 290 kDa copper-containing oxygenase consisting of four identical subunits, and its activity requires ascorbate as a cofactor. [5]
The ascorbate-glutathione cycle, sometimes Foyer - Halliwell - Asada pathway, is a metabolic pathway that detoxifies hydrogen peroxide (H 2 O 2), a reactive oxygen species that is produced as a waste product in metabolism. The cycle involves the antioxidant metabolites: ascorbate, glutathione and NADPH and the enzymes linking these metabolites.
2 Fe 3+ + Ascorbate → 2 Fe 2+ + Dehydroascorbate 2 Fe 2+ + 2 H 2 O 2 → 2 Fe 3+ + 2 OH· + 2 OH −. The relative importance of the antioxidant and pro-oxidant activities of antioxidants is an area of current research, but vitamin C, which exerts its effects as a vitamin by oxidizing polypeptides, appears to have a mostly antioxidant action ...
In enzymology, a L-ascorbate oxidase (EC 1.10.3.3) is an enzyme that catalyzes the chemical reaction. 2 L-ascorbate + O 2. ⇌ {\displaystyle \rightleftharpoons } 2 dehydroascorbate + 2 H 2 O. Thus, the two substrates of this enzyme are L- ascorbate and O 2, whereas its two products are dehydroascorbate and H 2 O. [1]