Glucuronic acid sodium salt

HEPES (8.14 g, 34.2 mmol) and MgCl2 (0.876 g, 9.2 mmol) were dissolved in 197 mL of distilled water and the pH was adjusted to 7 with 1 m NaOH solution. To the resulting solution UDP-glucuronic acid sodium salt (4250 mg, 6.58 mmol) and a solution of... 

TEMPO-mediated oxidation. With regenerated and mercerized celluloses, the oxidation leads to water-soluble p-l,4-linked poly glucuronic acid sodium salt (cellouronic acid, CUA) quantitatively [16]. In contrast, with native celluloses having the cellulose I crystal structure, the cellulose slurries maintain the slurry states even after TEMPO-mediated oxidation. These modified celluloses form water-insoluble fibers [17]. This has enabled modification of the surface of cellu-losic fibers. 

Glucuronic acid, sodium salt. See Sodium glucuronate... 

Vanilloylglycine, feruloylglycine and /w-coumaric acid glucuronide are identified after oral administration of caffeic acid to humans [15], Intraperitoneal injection of the sodium salt of caffeic acid to rats also produces these conjugates. Thus, conjugation with glycine or glucuronic acid in body tissues is demonstrated. 

Calcium, barium and sodium 1,2-isopropylidene-D-glucuronates were prepared from authentic 1,2-isopropylidene-D-glucuronic acid. The crystalline calcium salt contained 5.5 molecules of water and had [a]n25 —1.54° (c, 1.97, water), while the barium salt was a monohydrate insoluble in water. The anhydrous sodium salt had [a]D25 —2.58° (c, 10.74, water). 

Xanthan Gum occurs as a cream colored powder. It is a high-molecular-weight polysaccharide gum produced by a pure-culture fermentation of a carbohydrate with Xanthomonas campestris, purified by recovery with isopropyl alcohol, dried, and milled. It contains D-glucose and D-mannose as the dominant hexose units, along with D-glucuronic acid and pyruvic acid, and it is prepared as the sodium, potassium, or calcium salt. It is readily soluble in hot or cold water, but it is insoluble in alcohol. Its solutions are neutral. 

At a relative humidity of 80%, the sodium salt of pig-mucosal heparin shows a fiber repeat of 1.65 nm, with a triclinic unit-cell containing one chain. The sodium salt of macromolecular heparin from rat skin, at 78% r.h., showed a repeat of 1.73 nm, and crystallized in an orthorhombic unit-cell. After 24 hours at 84% r.h., the repeat changed to 1.65 nm, the pattern corresponding to that of pig-mucosal heparin. The stereochemistry of the chain in terms of the chain repeat and , i/r maps was discussed. It was suggested that the chemical formula for heparin is poly[(l— 4)-/3-D-GlcpA-(l— 4)- -d-GlcNAcp], and a scheme of 5-epimerization of /3-D-glucuronic acid to a-L-iduronic acid was discussed. 

Methyl-,4C D-glucuronate was prepared44 from the D-glucofuran-uronic acid derivative 22 (obtained by benzylidenation of D-glu-curonic acid in the presence of zinc chloride) by treating its sodium salt with methyl-14C iodide, followed by hydrogenolysis of the ester 23 in the presence of palladium-on-carbon the infrared (i.r.) spectrum of the product was identical to that of authentic 2. 

Heyns and coworkers have shown that D-glucuronic acid and its potassium and sodium salts react much more rapidly than D-glucose with primary and secondary arylamines,303,304 aliphatic amines,305 and the amino group of an amino acid,305 306 in aqueous or alcoholic media, to... 

Alginic acid Linear polymer made of P-1, 4-D-mannuronic and 1-glucuronic acids Extracted from brown algae, the polymer sodium salt and not the free acid or calcium salt dissolves in water Thickening, emulsifying, or gel-forming agent... 

The PhEur 2005 describes sodium hyaluronate as the sodium salt of hyaluronic acid, a glycosaminoglycan consisting of D-glucuronic acid and N-acetyl-o-glucosamine disaccharide imits. 

The USPNF 23 describes xanthan gum as a high molecular weight polysaccharide gum. It contains D-glucose and D-mannose as the dominant hexose units, along with D-glucuronic acid, and is prepared as the sodium, potassium, or calcium salt. 

A portion is present as the sodium salt of the liberated carboxyl groups on the glucuronic acid residues attached to the xylan chains the amount is readily computed from the free carboxyl content after removal of sodium by acid washing. 

---