uronic acid การใช้

• It is not found in nature, but its uronic acid, iduronic acid, is important.
• Ester linkages arise between oxidized sugars, the uronic acids, and the phenols and phenylpropanols functionalities of the lignin.
• Potassium permanganate is added to react with the unsaturated compounds ( lignin and uronic acids ) in the pulp and back-titrated.
• The chains are long, linear carbohydrate polymers that are negatively charged under physiological conditions due to the occurrence of sulfate and uronic acid groups.
• Jorpes discovered the structure of the heparin polysaccharide in 1935, identifying that it is a highly sulfonated polymer of glycosaminoglycoglycan ( GAG ) and uronic acid.
• These comprise 2-aminosugars linked in an alternating fashion with uronic acids, and include polymers such as heparin, heparan sulfate, chondroitin, keratan, and dermatan.
• Position of N-acetyl, N-sulfate, and O-sulfate groups in these uronic acids can vary, as can the branching patterns of the chain.
• A laboratory synthesis of a uronic acid from an aldose requires protecting the aldehyde and hydroxy groups from oxidation, for example by conversion to cyclic acetals ( e . g ., acetonides ).
• There is no internationally accepted molecular standard for the composition of heparin, as it is a complex polymer of GAG units and uronic acids ( including D-glucuronic acid, L-iduronic acid, and D-glucosamine ).
• Next, C-5 uronyl epimerase coverts d-GlcA to l-IdoA followed by 2-" O " sulfation of the uronic acid sugar by 2-" O " sulfotransferase ( Heparan sulfate 2-O-sulfotransferase ).
• Several scientists have determined the composition of plant root mucilage using monosaccharide analysis and linkage analysis showing that Maize ( Zea mays ) root mucilage contained high levels of galactose, xylose, arabinose, rhamnose, glucose, and lower levels of uronic acid, mannose, fucose and glucuronic acid.
• George claims that  & milk is still recommended as the best source of calcium as calcium in plants  & either comes in a form the body cannot use very well or occurs in the presence of other compounds ( such as phytates, fiber, cellulose, uronic acids, and oxalates in the case of calcium ) that prevent its use.
• An aldaric acid is an aldose in which both the hydroxyl function of the terminal carbon and the aldehyde function of the first carbon have been fully oxidized to carboxylic acid functions . ( Oxidation of just the aldehyde yields an aldonic acid while oxidation of just the terminal hydroxyl group yields an uronic acid . ) Aldaric acids cannot form cyclic hemiacetals like unoxidized sugars, but they can sometimes form lactones.