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A non‐isothermal bioreactor utilizing immobilized baker's‐yeast cells: a study of the effect on invertase activity
Author(s) -
Russo P.,
Garofalo A.,
Bencivenga U.,
Rossi S.,
Castagnolo D.,
D'Acunzo A.,
FS Gaeta,
DG Mita
Publication year - 1996
Publication title -
biotechnology and applied biochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.468
H-Index - 70
eISSN - 1470-8744
pISSN - 0885-4513
DOI - 10.1111/j.1470-8744.1996.tb00369.x
Subject(s) - invertase , bioreactor , isothermal process , membrane , yeast , chemistry , membrane bioreactor , substrate (aquarium) , catalysis , chemical engineering , chromatography , enzyme , biochemistry , thermodynamics , organic chemistry , biology , ecology , physics , engineering
The behaviour of the enzyme invertase, located on the cell wall of baker's‐yeast cells and entrapped in a gelatin membrane, was studied under isothermal and non‐isothermal conditions. The reaction rate linearly increased with the applied transmembrane temperature gradient, with reference either to the average temperature or to the temperature on the warm side of the catalytic membrane. These results were obtained both when the bioreactor was operated under conditions of closed volumes and when the substrate‐containing solutions are recirculated. The mathematical relationships have been elaborated between the temperatures read in the working solutions and those on the two faces of the catalytic membrane. Since the temperature difference across the membrane is smaller than that indicated by the thermocouples, the observed effects are greater than expected. The potential advantages of the use of a non‐isothermal bioreactor in processes of industrial interest are discussed.