title: [Properties of amylase immobilized on aerosil derivatives].
abstract: The properties of three preparations of alpha-amylase immobilized on aminoaerosil by 2,4-toluylenediisocyanate and N,N'-dicyclohexylcarbodiimide as well as on carboxyaerosil by N,N'-dicyclohexylcarbodiimide were compared with the properties of soluble enzyme. Under immobilization the pH-effect and pH-stability zones of amylase are 0.5--1.0 pH units shifted towards the alkaline region. The preparations in which the enzyme is bound with the matrix through the amine groups on carboxyaerosil by N,N'-dicyclohexylcarbodiimide and on aminoaerosil by 2,4 toluylenediisocyanate are the most stable at 50 degrees C and to the EDTA effect. The preparation obtained by means of 2,4-toluylenediisocyanate contains a greater amount of the bound protein, is more active and stable.
mesh_terms: D000681:Amylases / Q000378:metabolism*; D001236:Aspergillus oryzae / Q000201:enzymology; D004024:Dicyclohexylcarbodiimide; D004355:Drug Stability; D004800:Enzymes, Immobilized / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D012822:Silicon Dioxide; D013696:Temperature; D014051:Toluene 2,4-Diisocyanate; D000516:alpha-Amylases / Q000378:metabolism*
chemical_list: D004800:Enzymes, Immobilized; D014051:Toluene 2,4-Diisocyanate; D004024:Dicyclohexylcarbodiimide; D012822:Silicon Dioxide; D000681:Amylases; D000516:alpha-Amylases
vernacular_title: O svoĭstvakh amilazy, immobilizovannoĭ na proizvodnykh azrosila.