title: [Purification of alpha-amylase by affinity chromatography on cross-linked starch].
abstract: Affinity chromatography on cross-linked starch affords a simple and rapid procedure for alpha-amylases (EC 3.2.1.1.) purification. When starch is cross-linked in alkaline medium by epichlorhydrin in the conditions described, the insoluble polysaccharide obtained is able to retain specifically the alpha-amylase which is then eluted with 2M maltose solution. alpha-amylase can be obtained in a pure form with a 60% yield. The exoenzyme beta-amylase (EC 3.2.1.2) is not retained by the support and is eluted with other contaminant proteins. Therefore, this procedure allows the separation of the endo- and exoamylase activities.
mesh_terms: D000681:Amylases / Q000302:isolation & purification*; D001665:Binding Sites; D002846:Chromatography, Affinity / Q000379:methods; D011485:Protein Binding; D013213:Starch
chemical_list: D013213:Starch; D000681:Amylases
vernacular_title: Purification d'alpha-amylases par chromatographie d'affinité sur amidon réticulé