Abstract
Seven strains of the genus Kluyveromyces were screened for β-galactosidase activity and Kluyveromyces marxianus ATCC 16045 was selected as the best enzyme producer for culture medium optimization. The production of β-galactosidase by submerged cultivation was evaluated using a factorial design and response surface methodology. The culture medium containing whey and parboiled rice effluent was formulated to maximize the production of β-galactosidase. The effects of the initial pH and the concentrations of whey lactose, peptone, (NH4)2SO4, yeast extract, and parboiled rice effluent on enzyme production were studied using a 2 6-2IV fractional design. A CCRD (24 trials plus axial and central points) was used for the four variables selected from the fractional design (lactose, peptone, (NH4)2SO4 and yeast extract), with β-galactosidase activity as the response. The optimum conditions established for production were a whey (lactose) concentration of 120 g/L, a yeast extract concentration of 5 g/L, a peptone concentration of 15 g/L, a (NH4)2SO4 concentration of 15 g/L, a parboiled rice effluent concentration of 30 g/L, and a pH value of 4.0. Under these conditions, the highest enzymatic activity of 10.4 U/mL was measured, being 9.5–9.7 as the values predicted by the proposed model, showing an enzymatic activity increase of 30% using alternative sources of lactose and nitrogen for β-galactosidase production.
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The present work was carried out with the financial support of FAPERGS, CNPq, and CAPES, entities of the Brazilian government.
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Braga, A.R.C., Gomes, P.A. & Kalil, S.J. Formulation of Culture Medium with Agroindustrial Waste for β-Galactosidase Production from Kluyveromyces marxianus ATCC 16045. Food Bioprocess Technol 5, 1653–1663 (2012). https://doi.org/10.1007/s11947-011-0511-0
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DOI: https://doi.org/10.1007/s11947-011-0511-0