β-galactosidase activity as affected by apparent pH and physical properties of reduced moisture systems
Enzymatic activity observed in low moisture systems has been analyzed from several standpoints. The rates of enzymatic reactions depend on many factors, the molecular mobility of the reactants and the properties of the matrices in which they are embedded (pH, viscosity, ionic strength) being often c...
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2002
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| LEADER | 12741caa a22013097a 4500 | ||
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| 001 | PAPER-5414 | ||
| 003 | AR-BaUEN | ||
| 005 | 20230518203503.0 | ||
| 008 | 190411s2002 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-0037070487 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 030 | |a EMTED | ||
| 100 | 1 | |a Burin, L. | |
| 245 | 1 | 0 | |a β-galactosidase activity as affected by apparent pH and physical properties of reduced moisture systems |
| 260 | |c 2002 | ||
| 270 | 1 | 0 | |m Buera, M.D.P.; Departamento de Industrias, Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina; email: pilar@di.fcen.uba.ar |
| 506 | |2 openaire |e Política editorial | ||
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| 520 | 3 | |a Enzymatic activity observed in low moisture systems has been analyzed from several standpoints. The rates of enzymatic reactions depend on many factors, the molecular mobility of the reactants and the properties of the matrices in which they are embedded (pH, viscosity, ionic strength) being often controlling aspects. The objective of present work was to investigate β-galactosidase activity as affected by pH-moisture dependence and by physical properties of the matrix in reduced moisture systems of whey (W) and dextranes (Dx). β-galactosidase from 3 different sources, Escherichia coli, Aspergillus oryzae, and Saccharomyces lactis, were tested. β-galactosidase activity from S. lactis was reduced in W systems. pH-moisture dependence was proposed as the main cause of this low activity. The decrease of apparent pH upon water removal and the molecular mobility of the polymeric matrix, and of the enzyme, which is related to their size, appear to be more significant factors than the actual value of the glass transition temperature (Tg) of the matrix on β- galactosidase activity. Therefore, all properties concerning physico-chemical aspects have to be considered to analyze enzyme activity in low moisture biomaterials. © 2002 Elsevier Science Inc. All rights reserved. |l eng | |
| 536 | |a Detalles de la financiación: Secretaría de Ciencia y Técnica, Universidad de Buenos Aires | ||
| 536 | |a Detalles de la financiación: Agencia Nacional de Promoción Científica y Tecnológica, PIP-CONICET 02734, PICT 09-06251, BID 1201 OC-AR | ||
| 536 | |a Detalles de la financiación: International Foundation for Science | ||
| 536 | |a Detalles de la financiación: Universidad de Buenos Aires | ||
| 536 | |a Detalles de la financiación: The authors acknowledge financial support from Universidad de Buenos Aires (Proyecto IX05) (Secretarı́a de Ciencia y Técnica), Agencia Nacional de Promoción Cientı́fica y Tecnológica BID 1201 OC-AR, PICT 09-06251, PIP-CONICET 02734 and from the International Foundation for Science (Sweden). We appreciate greatly the comments and suggestions given by Carolina Schebor during the preparation of the manuscript. | ||
| 593 | |a Departamento De Industrias, Facultad De Ciencias Exactas Y Naturales, Universidad De Buenos Aires, 1428 Buenos Aires, Argentina | ||
| 690 | 1 | 0 | |a Β-GALACTOSIDASE ACTIVITY |
| 690 | 1 | 0 | |a GLASS TRANSITION |
| 690 | 1 | 0 | |a LOW MOISTURE |
| 690 | 1 | 0 | |a MOBILITY |
| 690 | 1 | 0 | |a BIOMATERIALS |
| 690 | 1 | 0 | |a GLASS TRANSITION |
| 690 | 1 | 0 | |a IONIC STRENGTH |
| 690 | 1 | 0 | |a MOISTURE |
| 690 | 1 | 0 | |a MOLECULAR BIOLOGY |
| 690 | 1 | 0 | |a PHYSICAL CHEMISTRY |
| 690 | 1 | 0 | |a POLYMERS |
| 690 | 1 | 0 | |a POLYMERIC MATRIX |
| 690 | 1 | 0 | |a ENZYMES |
| 690 | 1 | 0 | |a BETA GALACTOSIDASE |
| 690 | 1 | 0 | |a BIOMATERIAL |
| 690 | 1 | 0 | |a DEXTRAN DERIVATIVE |
| 690 | 1 | 0 | |a WATER |
| 690 | 1 | 0 | |a ASPERGILLUS ORYZAE |
| 690 | 1 | 0 | |a CONFERENCE PAPER |
| 690 | 1 | 0 | |a CONTROLLED STUDY |
| 690 | 1 | 0 | |a ENZYME ACTIVITY |
| 690 | 1 | 0 | |a ESCHERICHIA COLI |
| 690 | 1 | 0 | |a GLASS TRANSITION TEMPERATURE |
| 690 | 1 | 0 | |a IONIC STRENGTH |
| 690 | 1 | 0 | |a MOISTURE |
| 690 | 1 | 0 | |a MOLECULAR DYNAMICS |
| 690 | 1 | 0 | |a NONHUMAN |
| 690 | 1 | 0 | |a PHYSICAL CHEMISTRY |
| 690 | 1 | 0 | |a SACCHAROMYCES |
| 690 | 1 | 0 | |a SACCHAROMYCES LACTIS |
| 690 | 1 | 0 | |a VISCOSITY |
| 690 | 1 | 0 | |a WHEY |
| 690 | 1 | 0 | |a ASPERGILLUS |
| 690 | 1 | 0 | |a ASPERGILLUS ORYZAE |
| 690 | 1 | 0 | |a ESCHERICHIA COLI |
| 690 | 1 | 0 | |a SACCHAROMYCES |
| 650 | 1 | 7 | |2 spines |a PH |
| 650 | 1 | 7 | |2 spines |a PH |
| 700 | 1 | |a Del Pilar Buera, M. | |
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