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 Inactivation kinetics of horseradish peroxidase in organic solvents of different hydrophobicity at different water contents
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/7735

title: Inactivation kinetics of horseradish peroxidase in organic solvents of different hydrophobicity at different water contents
authors: Saraiva, Jorge
Oliveira, Jorge C.
Oliveira, Susana
Hendrickx, Marc
keywords: Biocatalysis
Enzyme thermal inactivation
Time-temperature integrators
Water activity
issue date: 1996
publisher: Wiley-Blackwell
abstract: The thermal stability of horseradish peroxidase suspensions was studied in three organic solvents of different hydrophobicity (dodecane, octane, and 1-octanol) at three different water contents (14.1, 55.3 and 256.2mg water g−1 dry protein). In these conditions, the enzyme is much more stable than in aqueous solutions (inactivation temperatures were in the range of 125–150°C). The enzyme showed a similar stability when in the presence of organic solvents, compared to the enzyme in a solid matrix without organic solvents with the same water content. The inactivation kinetics was well described by assuming the existence of two iso-enzymes, both inactivating according to a First order model. The lowest value for the z-value of both fractions (around 15°C) was obtained at the higher water content studied. The use of solvent and water content variables should be adequate to develop time-temperature integrators to monitor thermal processes at 100–140°C.
URI: http://hdl.handle.net/10773/7735
ISSN: 1365-2621
publisher version/DOI: http://dx.doi.org/10.1046/j.1365-2621.1996.00343.x
source: International Journal of Food Science and Technology
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