title: Optimization of permeabilization process of yeast cells for catalase activity using response surface methodology.
abstract: Biotransformation processes accompanied by whole yeast cells as biocatalyst are a promising area of food industry. Among the chemical sanitizers currently used in food technology, hydrogen peroxide is a very effective microbicidal and bleaching agent. In this paper, permeabilization has been applied toSaccharomyces cerevisiaeyeast cells aiming at increased intracellular catalase activity for decomposed H2O2. Ethanol, which is non-toxic, biodegradable and easily available, has been used as permeabilization factor. Response surface methodology (RSM) has been applied in determining the influence of different parameters on permeabilization process. The aim of the study was to find such values of the process parameters that would yield maximum activity of catalase during decomposition of hydrogen peroxide. The optimum operating conditions for permeabilization process obtained by RSM were as follows: 53% (v/v) of ethanol concentration, temperature of 14.8 °C and treatment time of 40 min. After permeabilization, the activity of catalase increased ca. 40 times and its maximum value equalled to 4711 U/g.
authors.affiliation: Department of Chemical and Biochemical Engineering, Faculty of Chemical Technology and Engineering, University of Technology and Life Sciences , Bydgoszcz , Poland.
authors.forename: Ilona
authors.initials: I
authors.lastname: Trawczyńska
authors.affiliation: Department of Chemical and Biochemical Engineering, Faculty of Chemical Technology and Engineering, University of Technology and Life Sciences , Bydgoszcz , Poland.
authors.forename: Marek
authors.initials: M
authors.lastname: Wójcik
keywords: catalase; optimization; response surface methodology; yeast