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Abstract:

The glass transition temperature (Tg) of a dry ultrafiltrated pectinlyase (PL) preparation decreased from 56 to 24 °C when water content increased to 20%. The thermal transition temperature (Tp) for protein denaturation decreased greatly up to 40% moisture; above 40% no further changes in Tp were observed. In the glassy state, a lag period of approximately 7 days with no PL activity loss was observed; after that, PL activity was lost. Above Tg, the rates of PL inactivation greatly increased. In the glassy state Ea was 16.6 kJ/mol. When the system was in a higher mobility state (rubbery), Ea increased to 66.5 kJ/mol.

Registro:

Documento: Artículo
Título:Calorimetric studies on dry pectinlyase preparations: Impact of glass transition on inactivation kinetics
Autor:Taragano, V.M.; Pilosof, A.M.R.
Filiación:Departamento de Industrias, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Palabras clave:Dry pectinlyases; calorimetry; day length; electrophoretic mobility; enzyme activity; enzyme inactivation; glass transition temperature; pectinlyase; Glass transition; Moisture; Proteins; Ultrafiltration; Biotechnology; Calorimetry, Differential Scanning; Enzyme Activation; Enzyme Stability; Glass; Kinetics; Polysaccharide-Lyases; Ultrafiltration; Water
Año:2001
Volumen:17
Número:4
Página de inicio:775
Página de fin:777
DOI: http://dx.doi.org/10.1021/bp010030l
Título revista:Biotechnology Progress
Título revista abreviado:Biotechnol. Prog.
ISSN:87567938
CODEN:BIPRE
CAS:Polysaccharide-Lyases, 4.2.2.-; Water, 7732-18-5; pectin lyase, 4.2.2.10
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_87567938_v17_n4_p775_Taragano

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Citas:

---------- APA ----------
Taragano, V.M. & Pilosof, A.M.R. (2001) . Calorimetric studies on dry pectinlyase preparations: Impact of glass transition on inactivation kinetics. Biotechnology Progress, 17(4), 775-777.
http://dx.doi.org/10.1021/bp010030l
---------- CHICAGO ----------
Taragano, V.M., Pilosof, A.M.R. "Calorimetric studies on dry pectinlyase preparations: Impact of glass transition on inactivation kinetics" . Biotechnology Progress 17, no. 4 (2001) : 775-777.
http://dx.doi.org/10.1021/bp010030l
---------- MLA ----------
Taragano, V.M., Pilosof, A.M.R. "Calorimetric studies on dry pectinlyase preparations: Impact of glass transition on inactivation kinetics" . Biotechnology Progress, vol. 17, no. 4, 2001, pp. 775-777.
http://dx.doi.org/10.1021/bp010030l
---------- VANCOUVER ----------
Taragano, V.M., Pilosof, A.M.R. Calorimetric studies on dry pectinlyase preparations: Impact of glass transition on inactivation kinetics. Biotechnol. Prog. 2001;17(4):775-777.
http://dx.doi.org/10.1021/bp010030l