In the purification of acarbose by contacting an acarbose-containing solution with a cation exchanger to adsorb the acarbose, eluting the ion exchanger and collecting an eluate fraction enriched in purified acarbose, the improvement wherein the cation exchanger is a polymer obtained by polymerizing an aromatic compound possessing at least one vinyl group and at least one hydrophilic monomer in the presence of a solvent for the monomer which is a precipitant for the crosslinked polymer formed, is...

Die Erfindung betrifft Polymerisate bzw. polymere Kationenaustauscher auf der Basis von Aromaten mit einer oder mehreren Vinylgruppe(n) und hydrophilen Monomeren, ein Verfahren zu ihrer Herstellung sowie ihre Verwendung zur Reinigung von Acarbose.

Maltotriose derivatives of the general formula I in which R<1> are protective groups customary in sugar chemistry, and R<2> is a lower alkyl, lower alkenylmethyl, an aryl or aralkyl radical which can be ring-substituted by halogen, nitro, lower alkyl or lower alkoxy, are suitable for the preparation of acarbose by chemical means. Processes for their preparation are indicated.