Mikrobiol. Z. 2020; 82(3):55-64. Ukrainian.
doi: https://doi.org/10.15407/microbiolj82.03.055

Features of α-Galactosidase Production by Penicillium restrictum

N.V. Borzova, O.V. Gudzenko, L.D. Varbanets

Zabolotny Institute of Microbiology and Virology, NAS of Ukraine
154 Akad. Zabolotny Str., Kyiv, 03143, Ukraine

Optimization of producer culture conditions is a necessary step in obtaining biotechnologically important enzymes. The aims were to investigate some parameters of Penicillium restrictum Gilman & Abbott cultivation, identify carbon and nitrogen sources that will provide high α-galactosidase activity, and evaluate the culture’s ability to hydrolyze galactosecontaining carbohydrates. Methods. Micromycete was grown in submerged cultivation conditions at 25°C. Rhamnose, sucrose, guar galactomannan, grapefruit mill, soy flour, NaNO2, NaNO3, (NH4)2SO4, (NH4)2NO3, urea, yeast autolysate, yeast extract, peptone were used as carbon and nitrogen sources. Glycosidase activity was determined using synthetic nitrophenyl substrates; the ability to hydrolyze raffinose, stachyose and galactomannan was evaluated by the dinitrosalicylic method. Results. It was found that the maximum of α-galactosidase activity (6.05 U/ml) and productivity (0.036 U/ml/h) of P. restrictum was observed on the 7th day of incubation in case of rhamnose, soy flour and ammonium sulfate using. The hydrolysis rate of raffinose, stachyose and galactomannan was 133, 116 and 27 μmol/min/ml, respectively. Conclusions. The high P. restrictum ability to produce α-galactosidase was shown using appropriate media. The substrate specificity and high rate of hydrolysis of raffinose, stachyose, galactomannan opens up broad prospects for α-galactosidase from P. restrictum use in food, feed, paper industry and agricultural waste processing technologies.

Keywords: α-galactosidase, Penicillium restrictum, raffinose, stachyose, galactomannan.

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