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A stoichiometric analysis of biological xylitol production

Paper ID Volume ID Publish Year Pages File Format Full-Text
3959 201 2010 9 PDF Available
Title
A stoichiometric analysis of biological xylitol production
Abstract

In the biological production of xylitol from xylose it has been demonstrated that a low-level supply of oxygen to the culture (∼0.1 volume of air per volume of culture medium per minute) yields an increase of extracellular accumulated xylitol up to 0.65 gxylitol gxylose−1 in our experiments. In spite of the abundant experimental evidence regarding xylitol production, the advances in the mathematical description of the process are relatively scarce. In this work, a stoichiometric model considering the main biochemical reactions (metabolic fluxes) involved in microaerobic xylitol production is proposed. The main metabolic reactions in xylitol production by Candida parapsilosis were incorporated in order to establish a stoichiometric reaction rate analysis of the network. The reaction rates in the metabolic network were calculated both for determined and underdetermined systems. A comparison between predicted and experimentally measured or reported yields has shown that the proposed stoichiometric model correctly depicts the xylitol yield within a 12.8% average error for several xylose-assimilating yeasts. The expected xylitol concentrations for a production process were also estimated after a sensitivity analysis of the metabolic network. An analysis of the estimated metabolic fluxes provided insight into some physiological events involved in the production of xylitol by yeasts.

Keywords
Xylose; Xylitol; Candida parapsilosis; Metabolic network; Stoichiometric matrix; Stoichiometric model
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A stoichiometric analysis of biological xylitol production
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 50, Issues 1–2, 15 June 2010, Pages 1–9
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us