Disclosed herein is a process for preparing highly pure acarbose of formula (I) useful as medicine for the treatment of diabetes. The disclosed process comprises prepurifying an acarbose-containing solution using a synthetic adsorbent to produce a prepurified acarbose having an acarbose content of a predetermined level or more; and contacting the prepurified acarbose with a monodispersed, strongly acid cation exchanger, in one step, to absorb acarbose.

Hierin gegeben ein Prozeß für das Vorbereiten des in hohem Grade reinen acarbose von Formel (i) nützlich als Medizin für die Behandlung von Diabetes frei. Der freigegebene Prozeß enthält das Prepurifying eine acarbose-enthaltene Lösung mit einem synthetischen Adsorbent, a zu produzieren prepurified das acarbose, das einen acarbose Inhalt eines vorbestimmten Niveaus oder mehr hat; und das In Verbindung treten prepurified acarbose mit a monodispersed, stark saurer Kationenaustauscher, in einem Schritt, um acarbose aufzusaugen.
 
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