Showing papers on "Aldose published in 1978"

Process for separating a ketose from an aldose by selective adsorption

Abstract: A process for separating a ketose from a feed mixture comprising a ketose and an aldose which process comprises contacting the mixture with an adsorbent comprising a Y or X zeolite containing one or more selected cations at the exchangeable cationic sites thereby selectively adsorbing a ketose from the feed mixture and thereafter recovering the ketose. Preferably the ketose will be recovered by desorption from the adsorbent with a desorbent material.

Clear-rinse agent for mechanical dishwashers

Abstract: A clear-rinse agent concentrate for mechanical dishwashers containing, as sheeting component, from 10% to 80% by weight of a reaction product obtained by reacting under acid catalysis conditions (1) an aldose selected from the group consisting of a reducing monosaccharide having 5 to 6 carbon atoms and an oligosaccharide thereof having from 2 to 4 monosaccharide units, with (2) a polyglycol ether having an average molecular weight of from 190 to 450, in a molar ratio of from 1:0.4 to 1:1.5; as well as the method of clear-rinsing employing said agent.

Salts of N-glycosyl derivatives of polyene macrolides, especially N-methylglucamine salts as well as the method of their preparation

Abstract: The new compounds, N-methylglucamine salts of N-glycosyl derivatives of polyene macrolides particularly N-methylglucamine salts of N-glycosyl derivatives of amphotericin B, polifungin and nystatin are described herein. These compounds exhibit high pharamacological activity in some topical and sistemic fungal infections. The product is prepared by reaction of an amino group containing polyene macrolide with an aldose or ketose mono- or oligosaccharide, in an organic solvent medium or in the mixture of solvents characterized in that the formed N-glycosyl derivatives is precipitated from the reaction medium by water or with an aqueous solution of inorganic salt, preferably ammonium sulphate, and after crystallization from a higher alkanol of C 3-6 atoms, preferably n-butanol transformed into a salt, preferably an N-methylglucamine salt and then crystallized from higher alkanol, preferably n-butanol.

Synthesis of L-Gulose from D-Glucose via Aldose Interchange

Abstract: Im Zusammenhang mit Untersuchungen an dem Antibioticum Bleomycin werden Gulose-Derivate beno- tigt, deren Synthese aus D-Glucose untersucht wird.

Epimerization of aldose

Abstract: PURPOSE: The epimerization of aldoses is effected by heating an aqueous aldose in the presence of a molybdenic acid catalyst supported on anion exchange fibers, thus producing epimerized isomers with industrial advantage because the catalyst- removing process becomes unncessary and the catalyst activity is maintained. CONSTITUTION: An aldose as D-xylose is heated at a temperature higher than 70°C in the presence of a catalyst of (C) molybdenic acid supported on (B) anion exchange fibers, which are prepared by impregnating polyethylene fibers with vinylbenzyl chloride and divinylbenzene, polymerizing them and introducing tertiary amino groups to give the objective epimerized isomer. For example, D-xylose is continuously made to react, thus giving D-lyxose. The concentration of the aldose used is 40W80% and the anion exchange fibers preferably have less than 200 micron diameter and 3W5000 aspect ratio. COPYRIGHT: (C)1980,JPO&Japio