Berglund, Jennie published the artcileThe structure of galactoglucomannan impacts the degradation under alkaline conditions, HPLC of Formula: 59-23-4, the main research area is galactoglucomannan degradation alk hydrolysis sugar mol dynamic simulation.
Galactoglucomannan (GGM) from spruce was studied with respect to the degradation behavior in alk. solution Three reference systems including galactomannan from locust bean gum, glucomannan from konjac and the linear water-soluble CM-cellulose were studied with focus on mol. weight, sugar composition, degradation products, as well as formed oligomers, to identify relative structural changes in GGM. Initially all mannan polysaccharides showed a fast decrease in the mol. weight, which became stable in the later stage. The degradation of the mannan polysaccharides could be described by a function corresponding to the sum of two first order reactions; one slow that was ascribed to peeling, and one fast that was connected with hydrolysis. The galactose side group was stable under conditions used in this study (150 min, 90°C, 0.5 M NaOH). This could suggest that, apart from the covalent connection to C6 in mannose, the galactose substitutions also interact non-covalently with the backbone to stabilize the structure against degradation Addnl., the combination of different backbone sugars seems to affect the stability of the polysaccharides. For CM-cellulose the degradation was linear over time which further suggests that the structure and sugar composition play an important role for the alk. degradation Mol. dynamics simulations gave details about the conformational behavior of GGM oligomers in water solution, as well as interaction between the oligomers and hydroxide ions.
Cellulose (Dordrecht, Netherlands) published new progress about Base hydrolysis. 59-23-4 belongs to class alcohols-buliding-blocks, name is (2R,3S,4S,5R)-2,3,4,5,6-Pentahydroxyhexanal, and the molecular formula is C6H12O6, HPLC of Formula: 59-23-4.
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