The extract from defatted almond meal, called emulsin, contains b-glucosidases and oxynitrilases. Oxinitrilase catalyzes the formation of chemical equilibrium between a-hydroxynitriles and their corresponding aldehydes and HCN. In the presence of an excess of HCN this enzyme catalyzes the stereospecific addition of HCN to a nuber of aldehydes to form optically active a-hydroxynitriles which are building blocks for asimetric organic synthesis. Glycosylhydrolases usually catalyze the stereospecific hydrolysis of glycosidic bonds but they can also be used for the formation of glycosidic bonds by means of two process: reverse hydrolysis and transglycosilation. Both enzynes are currently used in our laboratory for synthetic applications. In particular we use the b-glucosidase from almond to glycosylate various alcohol bearing allyl functionalities with the aim of producing glycosyl monomers which produce hydrophilic polymer coatings and DNA separation matrices. The isolation of the enzymes from sweet almonds requires a fractional ammonium sulphate precipitation followed by ion exchange chromatography on a DEAE cellulose. Capillary zone electrophoresis provided an excellent tool for the analysis of enzymes in the different purification steps. The separation of the enzyme isoformes was achieved in capillary columns coated with polyacryolylaminoetoxyethanol (polyAAEE) at different pH values.

Capillary zone elactrophoresis of hydroxynitrile lyase and b-glucosidase from sweet almond / M. Chiari, S. Riva, D. Tura. ((Intervento presentato al 10. convegno Capillary Electrophoresis and isotachophoresis tenutosi a Prague, Czech Republic nel 1996.

Capillary zone elactrophoresis of hydroxynitrile lyase and b-glucosidase from sweet almond

S. Riva;D. Tura
1996

Abstract

The extract from defatted almond meal, called emulsin, contains b-glucosidases and oxynitrilases. Oxinitrilase catalyzes the formation of chemical equilibrium between a-hydroxynitriles and their corresponding aldehydes and HCN. In the presence of an excess of HCN this enzyme catalyzes the stereospecific addition of HCN to a nuber of aldehydes to form optically active a-hydroxynitriles which are building blocks for asimetric organic synthesis. Glycosylhydrolases usually catalyze the stereospecific hydrolysis of glycosidic bonds but they can also be used for the formation of glycosidic bonds by means of two process: reverse hydrolysis and transglycosilation. Both enzynes are currently used in our laboratory for synthetic applications. In particular we use the b-glucosidase from almond to glycosylate various alcohol bearing allyl functionalities with the aim of producing glycosyl monomers which produce hydrophilic polymer coatings and DNA separation matrices. The isolation of the enzymes from sweet almonds requires a fractional ammonium sulphate precipitation followed by ion exchange chromatography on a DEAE cellulose. Capillary zone electrophoresis provided an excellent tool for the analysis of enzymes in the different purification steps. The separation of the enzyme isoformes was achieved in capillary columns coated with polyacryolylaminoetoxyethanol (polyAAEE) at different pH values.
Settore AGR/03 - Arboricoltura Generale e Coltivazioni Arboree
Settore AGR/13 - Chimica Agraria
Settore AGR/15 - Scienze e Tecnologie Alimentari
Settore CHIM/10 - Chimica degli Alimenti
Capillary zone elactrophoresis of hydroxynitrile lyase and b-glucosidase from sweet almond / M. Chiari, S. Riva, D. Tura. ((Intervento presentato al 10. convegno Capillary Electrophoresis and isotachophoresis tenutosi a Prague, Czech Republic nel 1996.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/213495
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