Polysaccharides, sulfur-containing

Polymers, 20 389-412. See also Ethylene-propylene polymers Filled polymers Higher olefin polymers Polymerization Polysaccharides Shape-memory polymers (SMPs) SiC>2 polymer Special polymers Sulfur-containing polymers Thermosetting reactive polymers Water-soluble polymers aging of, 20 167... 

Reductive decomposition of the formazans of oxidized polysaccharides, by means of hydrogen sulfide, as with the simple sugar formazans, yields sulfur-containing, nitrogenous polysaccharide derivatives which contain thionic acid phenylhydrazide groups. For example, when a pyridine-ethanol solution of oxy-starch formazan or oxy-dextrin formazan is saturated with hydrogen sulfide, the vividly red solution turns colorless and a yellow precipitate, which gives the Wuyts reaction characteristic of the thionic acid phenylhydrazides, separates. 

Hydrocarbons Bile acids Sapogenins N-Aryl-N, N -dialkyl-urea herbicides [79] [81,82] [84] [86] rooi Cholestanone, a-cholestanol Triterpene derivatives CycltAexanol Sulfur-containing polysaccharides [80] [83] [85] [87]... 

There are also a number of nitrogen and sulfur containing polysaccharides including chitin and heparin. 

The distribution of sulfur-containing metabolites among marine organisms is even more general than that of organohalogen compounds, insofar as sulfur appears as much in the primary metabolites - polysaccharides - as in the secondary metabolites. Sulfated compotmds are... 

Acid Detergent Fiber. The ground sample is heated for 1 h under reflux in a solution of 2% cetyltrimethyl ammonium bromide [57-09-0] in IN sulfuric acid [7664-93-9]. The acid hydrolyzes and dissolves the nonceUulosic polysaccharides. The insoluble residue, relatively free of hemiceUuloses and containing aU the ceUulose and lignin, is filtered, dried, and corrected for ash to give the ADF value. 

Several natural polysaccharides are esterified with sulfuric or phosphoric acid. Sulfated bacterial polysaccharides are not, however, very common. One example is a polysaccharide from an Arthrobacter species, which is most probably linked to the proteoglycan and contains sulfated D-galactopy-ranosyl residues. An extracellular polysaccharide from a Phormidium spe-... 

Esterification is not difficult if xylan is first carefully precipitated from solution and dried to a fluffy, non-horny powder, or if the xylan can be highly swollen so as to make the polysaccharide molecules easily accessible to the esterifying reagents. Solechnik101 finds that swollen undried xylan, when treated with acetic anhydride containing sulfuric... 

Steeping and wet-milling processes are also utilized to separate soluble compounds from com. One process involves removal of soluble starch and protein from com by steeping com in a warm sulfurous acid solution for about one to two days. The undissolved com solids are then coarsely wet-milled and processed to collect the oil-containing germ for com oil production. Also, for more enzyme-resistant cellulose biomass, sulfuric acid or hydrochloric acid can be used to digest the cellulose polysaccharide into fermentable molecules. 

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