摘要:
A process for recovering unreacted sucrose from a reaction mixture of sucrose and a fatty acid alkyl ester in an organic solvent as reaction medium in the presence of a catalyst in the production of a sucrose fatty acid ester which comprises adjusting the reaction mixture from which a part of the organic solvent as reaction medium may be previously removed and to which water is added, to a neutral pH region, adding a newtral salt and sucrose to the reaction mixture to precipitate the sucrose fatty acid ester, filtering off the precipitate, and bringing the filtrate into contact with a reverse osmosis membrane to recover the unreacted sucrose. According to the invention, unreacted sucrose can be easily recovered, while the sucrose fatty acid ester not contaminated with the organic solvent as reaction medium can be obtained from the reaction mixture without using an organic solvent for purification.
摘要:
Process for preparing maltose derivatives characterised by allowing crystalline alpha-maltose, preferably alpha-maltose having an alpha-maltose isomer content of 55% or more, to react with a reagent under anhydrous conditions. By this process, maltose derivatives of high-quality can be obtained easily and in a consistently high yield.
摘要:
Oligosaccharides having the general formula (i) wherein R is R 1 or a group having the formula (ii) wherein R 1 is hydrogen or straight or branched C 1-18 -alkyl, which may comprise a terminal hydroxyl, amino, carbonyl, carboxyl or allyl group, and M + is a neutralizing cation, the glyco-protein conjugates thereof obtained with albumin, gamma-globulin or diphteria or tetanus toxoids and the polymer and copolymer derivatives of the compounds wherein R 1 comprises an allyl group, a method for their manufacture and their use as immunogens and antigens in the diagnosis and therapy of human and animal chlamydial infections are described.
摘要:
Procédé de synthèse organique d'oligosaccharides constituant ou correspondant à des fragments de muco-polysaccharides acides dans lequel on fait réagir deux composés constitués ou terminés respectivement par des motifs de structure sucre aminé et des motifs de structure acide uronique. Ces motifs étant substitués spécifiquement. Ce procédé conduit à des oligosaccharides utilisables notamment en thérapeutique.
摘要:
Verfahren zur Erniedrigung der Viskosität von Formose bzw. Gemischen aus Formose und Mono- und/oder Disacchariden durch Zusatz eines viskositätserniedrigenden Mittels, dadurch gekennzeichnet, dass man als viskositätserniedrigendes Mittel Diaikylphosphite verwendet.