Abstract: Synthesis of an amino-disaccharide, amino-oligosaccharide or a derivative thereof, characterized in that a monosaccharide, a disaccharide, an oligosaccharide, a glycoside or a derivative thereof, in the presence of a glycosidase as catalyst, is reacted with an amino-deoxy-saccharide or a glycoside or derivative thereof, and that the amino-saccharide is optionally isolated from the product mixture directly or after chemical/enzymatic modification.

Abstract: Disclosed is a method of producing a compound which contains the Glc.beta.1-4GlcN structure involving reacting at least one donor substance Glc.beta.OR where R is an organic group, and at least one acceptor substance which is a glucopyranosamino derivative having the formula GlcNR"-R'", wherein NR" is an azido, 2-N-acetyl-, 2-N-phtalimido, or an organic group bound to the 2-N-group of glucosamine, wherein R'" is a glycosidically bound fluoro or is an O-, C-, N- or S-glycosidically bound aliphatic or aromatic compound, with the optional proviso that if NR" is NHAc then R'" is not OH and if NR" is not NHAc then R'" may be OH, in the presence of Bullera singularis or an E.C. group 3.2 glycosidase of essentially the same structure as an E.C. group 3.2 glucosidase obtained from Bullera singularis to form the Glc.beta.1-4GlcN derivative; and optionally isolating the compound which contains the Glc.beta.1-4GlcN structure.

Abstract: Synthesis of an amino-disaccharide, amino-oligosaccharide or a derivative thereof, characterized in that a monosaccharide, a disaccharide, an oligosaccharide, a glycoside or a derivative thereof, in the presence of a glycosidase as catalyst, is reacted with an amino-deoxy-saccharide or a derivative thereof, and that the amino-saccharide is isolated from the product mixture directly or after chemical/enzymatic modification.

Abstract: Method for synthesis of GalNAc.alpha.-serine or GalNAc.alpha.-threonine containing compounds, including at least one reaction where an .alpha.-saccharide or .alpha.-glycoside of GalNAca is used as gylcosyl donor and a derivative of serine of threonine is used as acceptor in a transglycosylation reaction with N-acetyl-.alpha.-D-galactosaminidase as the catalyst, wherein said acceptor has been modified in its N-terminal .alpha.-amino group and optionally in its c-terminal carboxyl group.

Abstract: Synthesis of an amino-disaccharide, amino-oligosaccharide or a derivative thereof, characterized in that a monosaccharide, a disaccharide, an oligosaccharide, a glycoside or a derivative thereof, in the presence of a glycosidase as catalyst, is reacted with an amino-deoxy-saccharide or a derivative thereof, and that the amino-saccharide is isolated from the product mixture directly or after chemical/enzymatic modification.