摘要:
α-Lactosamine hydrochloride, substantially free of β-lactosamine hydrochloride; a method of preparing α-lactosamine hydrochloride monohydrate from an anomeric mixture of lactosamine hydrochloride, including: preparing a solution including the anomeric mixture of lactosamine hydrochloride, water and at least one water-miscible organic solvent at a temperature of 0-100° C., and cooling the solution to cause crystallisation of α-lactosamine hydrochloride monohydrate; a method of preparing anhydrous α-lactosamine hydrochloride; and use of α-lactosamine hydrochloride as a food supplement or intermediate in synthesis.
摘要:
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.
摘要:
The invention provides engineered enzymes of transsialidase and/or sialyl transferase activity that have increased regioselectivity and/or increased thermostability.
摘要:
Mutated fucosidases are provided demonstrating improved properties in terms of thermal stability and transfucosidase synthetic performance compared with a wild type transfucosidase isolated from Bifidobacterium longum subsp. infantis.
摘要:
A mixture of human milk oligosaccharides that consists essentially of 6′-SL, LNnT and LSTc, made by treating 6′-SL and LNnT in the presence of an α2,6-transsialidase.
摘要:
The invention relates to a mixture of human milk oligosaccharides that consists essentially of: a) a component A which is 3-FL or DFL, a component B which is LNT, LNnT, LNFP-I or 2′-FL, a component C, which is LNFP-II when component B is LNT, or LNFP-III when component B is LNnT, or LNDFH-I when component B is LNFP-I, or DFL when component B is 2′-FL, and a component D, which is lactose when component A is 3-FL, or 2′-FL when component A is DFL, with the proviso that if component B is 2′-FL, then component A is 3-FL; or consists essentially of: b) 3-FL, a component E which is LNT, LNnT or LNFP-I, and a component F, which is LNFP-II when component E is LNT, or LNFP-III when component E is LNnT, or LNDFH-I when component E is LNFP-I, and to processes for producing them and their uses.
摘要:
A method of diversification of human milk oligosaccharides (HMOs) or precursors thereof, compounds obtainable by the method, and uses and compositions involving such compounds. The method comprises a) providing at least one compound or a mixture of the compounds selected from the group consisting of: optionally sialylated and/or fucosylated lactose derivatives of general formula 2 and salts thereof; b) adding at least one enzyme comprising a transglycosidase activity to the at least one compound or a mixture of compounds provided according to step a); and c) incubating the mixture obtained according to step b).
摘要:
An achemo-enzymatic synthesis of oligosaccharides of formula 1 is presented wherein R is selected from —OH, —N3 and —OR6 wherein R6 is selected from allyl optionally substituted by one or more methyl, propargyl optionally substituted by one or more methyl, 2-trimethylsilyl-ethyl, —(CH2)n—NH2 and —(CH2)n—N3 wherein integer n is to 10, preferably 2 or 3, R is selected from sialyl moiety, —SO3H and —CH(R)—COOH wherein R is selected from H, alkyl and benzyl, R2 is selected from H and fucosyl, R3 is selected from H and sialyl, R4 is selected from H and fucosyl, provided that at least one of R3 and R4 is H, and A is a divalent carbohydrate linker, having important biological activities and significant commercial value for the pharmaceutical and food industry.
摘要:
A method for making an N-substituted D-mannosamine derivative of the following formula 1 and its salts wherein R1 is a non-electron-withdrawing group, and wherein R2 is —OH or R2 is —NHR3 wherein R3 is a group removable by hydrogenolysis; by epimerizing an N-substituted D-glucosamine derivative of the following formula 2 wherein R1 and R2 are as defined above.
摘要:
A mixture of human milk oligosaccharides that consists essentially of 6′-SL, LNnT and LSTc, made by treating 6′-SL and LNnT in the presence of an α2,6-transsialidase.