Naslov
Selection of Yeast Strain K. marxianus for Alcohol and Biomass Production on Whey

Autori
Grba, Slobodan ; Stehlik-Tomas, Vesna ; Stanzer, Damir ; Vahčić, Nada ; Škrlin, Ana

Izvornik
Chemical and Biochemical Engeenering Quartely (0352-9568) 16 (2002), 1; 13-16

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
K. marxianus; whey; fermentation; ethanol

Sažetak
This paper emphasizes the suitability of five different strains of yeast Kluyveromyces marxianus for alcoholic fermentation on deproteinized whey. The selection of yeast strains was performed at different cultivation conditions: temperatures were 300 C, 340 C and 37 0C respectively, and the concentration of lactose in the substrate varied from 5 % to 15 %. Cultivations were carried out in aerobic conditions on a rotary shaker, at pH 4, 5-5, 0. During cultivations the kinetics of alcoholic fermentations was analysed. Satisfactory results were achieved almost with all the yeast strains, but the best results were gained with K. marxianus VST 44 and ZIM 75 respectively. On the other hand, 34 0C seemed to be the optimal temperature for both strains. To optimize the process fed-batch cultivations were performed with the chosen strains of K. marxianus at 34 0C in aerobic/anaerobic conditions. The process ended after 12-14 hours. At the end of the process the biomass yield reached 10 g/L and the ethanol concentration was 7, 31 % (v/v). The results achieved in all experiments showed that the selected yeast strains K. marxianus VST 44 and ZIM 75 could be succesfully used in the ethanol and yeast biomass production on whey.

Izvorni jezik
Engleski

Znanstvena područja
Biotehnologija

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