Abstract
Oxygen availability is the most important environmental parameter in the production of xylitol by yeasts, directly affecting yields and volumetric productivity. This work evaluated the cell behavior in fermentations carried out with different dissolved oxygen concentrations (0.5–30.0% of saturation), as well as a limited oxygen restriction (0% of saturation), at several oxygen volumetric transfer coefficients (12 ≤k L a ≤ 70 h-1). These experiments allowed us to establish the specific oxygen uptake rate limits to ensure high yields and volumetric productivity. When oxygen availability was limited, the specific oxygen uptake rate values were between 12 and 26 mg of O2/ of g cell·h, resulting in a yield of 0.71 g of xylitol/xylose consumed, and 0.85 g/[L·h] for the volumetric productivity. According to the results, the effective control of the specific oxygen uptake rate makes it possible to establish complete control over this fermentative process, for both cell growth and xylitol production.
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Faria, L.F.F., Gimenes, M.A.P., Nobrega, R., Pereira, N. (2002). Influence of Oxygen Availability on Cell Growth and Xylitol Production by Candida guilliermondii . In: Finkelstein, M., McMillan, J.D., Davison, B.H. (eds) Biotechnology for Fuels and Chemicals. Applied Biochemistry and Biotechnology. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-4612-0119-9_37
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DOI: https://doi.org/10.1007/978-1-4612-0119-9_37
Publisher Name: Humana Press, Totowa, NJ
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