Abstract:
The invention relates to a method for selective crystallization of 2'-O-fucosyllactose (2'-FL) from an aqueous solution comprising 2'-FL and a fucosylated carbohydrate other than 2'-FL, preferably 2',3-di-O-fucosyllactose (DFL), by adding one or more C 1 -C 4 alcohols, preferably methanol, to the solution.
Abstract:
3- O -Fucosyllactose is made by process which includes the hydrogenolysis of a new compound of the formula 1 wherein R 1 and R 2 are independently a group removable by hydrogenolysis, and R 3 is a group removable by hydrogenolysis or H; or a hydrate or solvate thereof.
Abstract:
This invention relates to achemo-enzymatic synthesis of oligosaccharides of formula 1 I wherein R is selected from -OH, -N 3 and -OR 6 wherein R 6 is selected from allyl optionally substituted by one or more methyl, propargyl optionally substituted by one or more methyl, 2-trimethylsilyl-ethyl, -(CH 2 ) n -NH 2 and -(CH 2 ) n -N 3 wherein integer n is to 10,preferably 2 or 3, R is selected from sialyl moiety, -SO 3 H and -CH(R )-COOH wherein R is selected from H, alkyl and benzyl, R 2 is selected from H and fucosyl, R 3 is selected from H and sialyl, R 4 is selected from H and fucosyl, provided that at leastone of R 3 and R 4 is H, and A is a divalent carbohydrate linker, having important biological activities and significant commercial value for the pharmaceutical and food industry.
Abstract:
A mixture of, preferably a mixture consisting essentially of, an lacto-N-tetraose (LNT) precursor (1) and an lacto-N-neotetraose (LNnT) precursor (2), (formula 1, 2), where R is a group removable by hydrogenolysis and R 3 is either a group removable by hydrogenolysis or H, a method of crystallizing 1 and/or 2 from said mixture, and the use of said mixture for making a mixture consisting essentially of LNnT and LNT for use as a pharmaceutically or nutritionally active ingredient. The precursors can be made by reacting an acceptor of formula 5, (formula 5), wherein R is a group removable by hydrogenolysis, R 1 is acyl, Ri is acyl or H, R3 is selected from a group removable by hydrogenolysis, acyl, silyl and an acetal type group and Y is selected from alkanoylamido, haloalkanoylamido, -NAc2, benzamido, alkoxycarbonylamino, haloalkoxycarbonylamino, benzyloxycarbonylamino, azido, phthalimido, tetrachlorophthalimido, 2,3- diphenylmaleimido and 2,3-dimethylmaleimido, with a donor of formula 6, (formula 6), wherein R 4 is acyl and Xi is selected from halogen, -OC(=NH)CCl 3 , -OAc, -OBz or -SR 5 , wherein R 5 is selected from alkyl, substituted phenyl and unsubstituted phenyl, followed by one or more deprotection steps.
Abstract:
The present invention concerns a method for separating different oligosaccharides having at least one carboxylic acid group, also referred to as charged oligosaccharides. The method allows for the high throughput separation of oligosaccharides that are otherwise difficult to separate in non-chromatographic methods and involves the use of a weakly basic macroporous anion exchange resin.
Abstract:
The present invention relates to the separation and isolation of sialylated human milk oligosaccharides (HMOs) from the reaction mixture in which they are produced.
Abstract:
It is provided i) an amorphous carbohydrate with improved chemical stability and/or physical features, ii) a method for producing an amorphous carbohydrate with improved chemical stability and/or physical features, and iii) a method for improving the chemical stability and/or the physical features of an amorphous carbohydrate.
Abstract:
The invention relates to crystalline polymorphs of lacto-N-tetraose (LNT) and methods for making the same for use in pharmaceutical compositions, nutritional formulations and food supplements.
Abstract:
The invention relates to a method for selective crystallization of 2 '-fucosyllactose (2'-FL) from an aqueous solution comprising 2'-FL and one or more other fucosylated carbohydrates by adding acetic acid to the solution. The aqueous solution is separated from an aqueous culture medium prior to crystallization.