منابع مشابه
Ascorbic Acid Dehydroascorbic Acid C6 Dicarboxylic Acid
Dehydroascorbic acid is shown to be converted to 2-(threo-l,2,3-trihydroxypropyl)tartronic acid in aqueous alkaline solutions. The structure of the acid was determined by mass spectrometry of its acyclic Me3Si derivative. Mass spectrometric and chromatographic data are compared with those of related compounds. The acid is formed by a benzilic acid rearrangement of the intermediate 2,3-hexodiulo...
متن کاملBiosynthesis of Ascorbic Acid
hypophosphite for the conversion of D-glucuronolactone into L-ascorbic acid. 9. The presence of borate or Antabuse, each at mm-concentration, inhibits the conversion of Dglucuronolactone into L-ascorbic acid to about 50 %. 10. The optimum conditions for the action of the enzyme system have been studied. 11. The biosynthesized ascorbic acid has been identified by paper chromatography and by a bi...
متن کاملAnti-Allergic Activity of Monoacylated Ascorbic Acid 2-Glucosides.
2-O-α-d-Glucopyranosyl-l-ascorbic acid (AA-2G) is one of the stable ascorbic acid (AA) derivatives known as provitamin C agents. We have previously synthesized two types of monoacylated derivatives of AA-2G, 6-O-acyl-2-O-α-d-glucopyranosyl-l-ascorbic acids having a straight-acyl chain of varying length from C₄ to C18 (6-sAcyl-AA-2G) and a branched-acyl chain of varying length from C₆ to C16 (6-...
متن کاملIsolation of ascorbic acid 2-sulfate from selected rat organs.
Rats were injected subcutaneously with a5S042and [I-t4Clascorbic acid. A compound was isolated from rat liver and spleen which had chromatographic properties identical to synthetic ascorbic acid 2-sulfate (AAS). This compound gave a positive methanolic FeCla reaction, contained radioactive sulfur, and on hydrolysis it degraded to ~sSO42 and il~C]ascorbic acid. The isolated compound possessed id...
متن کاملascorbic acid treatment
The mechanisms regulating the secretion of proteoglycans and collagens in chondrocytes, in particular those operating at the level of the rough endoplasmic reticulum (RER), are largely unknown. To examine these mechanisms, I studied the effects of acute ascorbate treatment on the secretion of two collagen types (types II and IX) and two proteoglycan types (PG-H and PG-Lb, the major keratan sulp...
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ژورنال
عنوان ژورنال: ti<
سال: 2013
ISSN: 1929-4336
DOI: 10.26522/ti.v2i1.775