3- Methylglucose

The concentrations of nine sugars (fucose, methylglucose, arabinose, glucose, fructose, lactose, sucrose, cellobiose, and maltose) in beer, milk, and soda are determined using an... 

Trehalose is a nonreducing disaccharide that is hydrolyzed by aqueous acid to yield 2 equivalents of D-glucose. Methylation followed by hydrolysis yields 2 equivalents of 2,3,4,6-tetra-O-methylglucose. How many structures are possible for trehalose ... 

For the preparation of partially methylated sugars direct methylation is not as a rule a suitable process, for the mixture of isomers thus produced can be fractionated only with difficulty. Instead, it is customary to introduce protecting substituents prior to methylation and to remove them afterwards. As will be seen later, this is the method used in the synthesis of mono-, di-, and tri-methylglucoses. 

Proof of Constitution.—Schinle43 suggested that the methylglucose, formed together with 2-methyl-D-glucose from D-glucose dibenzyl... 

The values of a series of a- and /3-shifts have been determined for mono-O-methylglucoses and mono-O-methylmannoses, in order to aid in assignments of 13C signals of oligosaccharides and polysaccha-... 

Fig. 4.—Mass Fragmentography (m/e 161) of Methylated Hexose Derivatives from the Disialosy] Ganglioside. [Top, before treatment with neuraminidase bottom, after treatment with Vibrio cholerae neuraminidase. The methylated hexose derivatives identified are (A) 2,4,6-tri-O-methylgalactose (B) 2,3,6-tri-O-methylglucose (C) 2,3,4,6-tetra-O-methylgalactose. The peaks eluting before C are unrelated signals that were also detected in a blank experiment employing the neuraminidase treatment. Conditions 3% of QF-1, at 190°. Reproduced, by permission, from Ref. 80.]...

Mean particle size ranges 50 to 1000 mn. Depending on the type and concentration of the lipid, 0.5 to 5% emulsifier (surfactant) has to be added for physical stabilization. For dermal use, surfactants are very often poloxamer 188, polysorbate 80, lecithin, tyloxapol, polyglycerol methylglucose distearate (Tegocare 450), sodinm cocoamphoacetate (Miranol Ultra C32), or saccharose fatty acid ester. 

Only quinovose, glucose, 3-O-methylglucose, xylose and 3-0-methylxylose are present in the carbohydrate moieties of these glycosides. The first monosaccharide unit is always xylose, while 3-O-methylglucose and 3-0-methylxylose are always terminal. In comparison to steroidal... 

Boogaard, P.J., Mulder, G.J. Nagelkerke, J.F. (1989) Isolated proximal tubular cells from rat kidney as an in vitro model for studies on nephrotoxicity. II. a-Methylglucose uptake as a sensitive parameter for mechanistic studies of acute toxicity by xenobiotics. Toxicol, appl. Pharmacol., 101, 144-157... 

A 10.0 g sample of glycogen gave 6.0 millimol of 2,3-di-O-methylglucose on methylation and acid hydrolysis. 

With respect to reference compounds key rhamnose A tetra-O-methylglucose "glucose. Solvents 1, 1-butanol-acetic acid-ammonia-water (40 50 3 15) 2,1-butanol-water 3,1-butanol-pyridine- water (6 4 3) 4, l-butanol- ethanol-water (4 1 5, upper phase) 6t 1-butanol-ethanol-water (40 11 19) 6, 1-butanol-acetic acid-water (4 1 1). References are given in parentheses. 

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