OPTIMIZATION OF NITROGEN SOURCE AND DISSOLVED OXYGEN CONCENTRATION TO ENHANCE CO-PRODUCTION OF ETHANOL AND XYLITOL IN A CO-CULTURE SYSTEM OF TWO SACCHAROMYCES CEREVISIAE AND CANDIDA TROPICALIS STRAINS

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ZAHED O.; SALEHI JOZANI GH.R.; KHODAIYAN F.

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Journal: Journal of Molecular and Cellular Researches Year:2015 | Volume:28 | Issue:2 Page(s): 237-249

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Title

OPTIMIZATION OF NITROGEN SOURCE AND DISSOLVED OXYGEN CONCENTRATION TO ENHANCE CO-PRODUCTION OF ETHANOL AND XYLITOL IN A CO-CULTURE SYSTEM OF TWO SACCHAROMYCES CEREVISIAE AND CANDIDA TROPICALIS STRAINS

Author(s)

ZAHED O. | SALEHI JOZANI GH.R. | KHODAIYAN F. | Issue Writer Certificate

Keywords

BIOETHANOLQ1

CANDIDA TROPICALISQ2

OPTIMIZATIONQ2

SACCHAROMYCES CEREVISIAEQ2

XYLITOLQ2

Abstract

Application of biorefinery approach in which in addition to BIOETHANOL, simultaneously one or more other biological products are produced, has attracted attention as a new and hopeful strategy to economize ethanol production from lignocellulosic biomass. So, objective of the present study was to optimize co-production of ethanol and XYLITOL in a co-culture system of two SACCHAROMYCES CEREVISIAE and CANDIDA TROPICALISstrains in a batch fermentor. To determine the best nitrogen source, two strains were co-cultured on the medium containing one of 8 different organic and mineral nitrogen sources (6 g/l). The results showed that different nitrogen sources showed significantly different biorefinery efficiency, and the maximum ethanol (24.41 g/l), XYLITOL (22.7 g/l) and biomass (13.24 g/l) production was observed when yeast extract was used. At the next step, effect of different dissolved oxygen concentrations, 5, 10, 20 and 30%, was evaluated on the efficiency of ethanol and XYLITOL production at batch fermentor level. The maximum ethanol production (38 g/l) and yield efficiency (Yp/s= 0.47 gram ethanol per gram used glucose) was achieved when dissolved oxygen concentration was 5%, whereas the maximum XYLITOL production (21.6 g/l) and yield efficiency (Yp/s= 0.54 gram produced XYLITOL per gram used xylose) was achieved when dissolved oxygen concentration was 10%. Also, the maximum biomass (25.7 g/l) was achieved at 30% dissolved oxygen concentration. Finally, it could be concluded that the yeast extract and 5-10 % oxygen concentrations were selected as the best nitrogen source and oxygen concentrations, respectively, for co-production of xyltitol and ethanol by co-culture of the studied yeasts.

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APA: Copy

ZAHED, O., SALEHI JOZANI, GH.R., & KHODAIYAN, F.. (2015). OPTIMIZATION OF NITROGEN SOURCE AND DISSOLVED OXYGEN CONCENTRATION TO ENHANCE CO-PRODUCTION OF ETHANOL AND XYLITOL IN A CO-CULTURE SYSTEM OF TWO SACCHAROMYCES CEREVISIAE AND CANDIDA TROPICALIS STRAINS. JOURNAL OF MOLECULAR AND CELLULAR RESEARCH (IRANIAN JOURNAL OF BIOLOGY), 28(2), 237-249. SID. https://sid.ir/paper/248610/en

Vancouver: Copy

ZAHED O., SALEHI JOZANI GH.R., KHODAIYAN F.. OPTIMIZATION OF NITROGEN SOURCE AND DISSOLVED OXYGEN CONCENTRATION TO ENHANCE CO-PRODUCTION OF ETHANOL AND XYLITOL IN A CO-CULTURE SYSTEM OF TWO SACCHAROMYCES CEREVISIAE AND CANDIDA TROPICALIS STRAINS. JOURNAL OF MOLECULAR AND CELLULAR RESEARCH (IRANIAN JOURNAL OF BIOLOGY)[Internet]. 2015;28(2):237-249. Available from: https://sid.ir/paper/248610/en

IEEE: Copy

O. ZAHED, GH.R. SALEHI JOZANI, and F. KHODAIYAN, “OPTIMIZATION OF NITROGEN SOURCE AND DISSOLVED OXYGEN CONCENTRATION TO ENHANCE CO-PRODUCTION OF ETHANOL AND XYLITOL IN A CO-CULTURE SYSTEM OF TWO SACCHAROMYCES CEREVISIAE AND CANDIDA TROPICALIS STRAINS,” JOURNAL OF MOLECULAR AND CELLULAR RESEARCH (IRANIAN JOURNAL OF BIOLOGY), vol. 28, no. 2, pp. 237–249, 2015, [Online]. Available: https://sid.ir/paper/248610/en

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