Abstract
Laminaribiose phosphorylase (EC 2.4.1.31) catalyzes a reversible phosphorolysis reaction in which laminaribiose, a very high value sugar is produced. This enzyme is not being produced commercially therefore, to realize the most effective method for producing laminaribiose phosphorylase and obtaining as much activity units as possible per liter of culture, different cultivation methods of Euglena gracilis were compared. Heterotrophic and mixotrophic cultivations of Euglena gracilis in two different pHs, in flask and bioreactor were performed. The reverse phosphorolysis activity of laminaribiose phosphorylase produced under different cultivation methods was measured. The heterotrophic approach showed to be the more effective cultivation method as 47.6 IU/L was obtained compared to 27 IU/L in the mixotrophic one. The heterotrophic cultivation then was further investigated under two different pH values of the culture media. The culture at pH 6.8 resulted in 7.94 IU/L/day whereas only 4.06 was obtained for the culture at pH 4. Cultivation in a bioreactor resulted in a distinctive amount of 191.5 IU/L and an activity yield of 9.7 IU/g glucose compared to 5.4 in flask cultivation. Heterotrophic cultivation of Euglena gracilis in a bioreactor containing a culture media at pH 6.8 and controlled operation conditions showed enhanced laminaribiose phosphorylase activity production per liter and day of cultivation.
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Abi, A., Müller, C. & Jördening, HJ. Improved laminaribiose phosphorylase production by Euglena gracilis in a bioreactor: A comparative study of different cultivation methods. Biotechnol Bioproc E 22, 272–280 (2017). https://doi.org/10.1007/s12257-016-0649-8
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DOI: https://doi.org/10.1007/s12257-016-0649-8