| Autor: |
Stehlik Tomas, Vesna, Gulan Zetić, Vlatka, Stanzer, Damir, Grba, Slobodan, Vahčić, Nada |
| Jazyk: |
angličtina |
| Rok vydání: |
2004 |
| Předmět: |
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| Popis: |
The aim of the present work was to study the incorporation of some microelements in the yeast S. cerevisiae and its impact on the physiological state of the yeast cells during the alkoholic fermentation. The cultivations were performed on molasses medium in anaerobic and semiaerobic conditions with and without the addition of zinc, copper and manganese sulphate (0.1 g/L of each) at 30oC and different pH values of the medium (3.5-6) for 8 h. The addition of the mentioned salts in molasses medium enhanced the yield of the yeast biomass up to 30% in semiaerobic conditions, but the ethanol yield was changed very little. On the other hand, in anaerobic conditions, the yields of the yeast biomass were increased up to 10% and alcohol yield up to 20%. The highest amount of Zn ions in dry matter (0.7mg/g) was incorporated in the yeast biomass under anaerobic conditions. In contrast, the incorporation of Cu and Mn was preferred in semiaerobic conditions and the highest value of Cu ions in dry matter (1.1mg/g) and Mn in dry matter (0.3 mg/g) in yeast biomass were obtained. Optimal pH for all incorporations was between 4 and 5. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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