Characterization of β-glucosidase activity in yeasts of oenological origin |
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Authors: | Iolanda Rosi M Vinella P Domizio |
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Institution: | Dipartimento di Biologia, Difesa, Biotecnologie Agro-Forestali, Universitàdella Basilicata, Potenza, Italy |
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Abstract: | I. ROSI, M. VINELLA AND P. DOMIZIO. 1994. Three hundred and seventeen strains representing 20 species of yeasts were screened for the presence of β-glucosidase activity. All of the strains of the species Debaryomyces castellii, Deb. hansenii, Deb. polymorphus, Kloeckera apiculata and Hansenula anomala showed β-glucosidase activity, but only one of 153 strains of Saccharomyces cerevisiae. The other species behaved differently, depending upon the strain. The strains that hydrolysed arbutin were checked to localize the β-glucosidase activity. A strain of Deb. hansenii exhibited the highest exocellular activity and some wall-bound and intracellular activity. The β-glucosidase synthesis from this yeast was enhanced by aerobic conditions of growth, was repressed by high glucose concentration (9%) and occurred during exponential growth. The optimum conditions for enzymatic preparations of Deb. hansenii were between pH 4.0 and 5.0 and 40 C. A high concentration of ethanol and glucose did not reduce the ezymatic activity. The enzymatic preparations of Deb. hansenii released monoterpenols and other alcohols from a grape glycoside extract. |
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