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Semi-continuous xylose-to-xylitol bioconversion by Ca-alginate entrapped yeast cells in a stirred tank reactor

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Abstract

Candida guilliermondii FTI 20037 cells were entrapped in Ca-alginate beads and used for xylose-to-xylitol bioconversions during five successive batches in a stirred tank reactor. Supplemented sugarcane bagasse hemicellulosic hydrolysate was used as the fermentation medium. The average volume of the Ca-alginate beads was reduced by about 30% after the 600 h taken to perform the five bioconversion cycles, thus demonstrating physical instability under the conditions prevailing in the reactor vessel. In spite of this, almost steady bioconversion rates and yields were observed along the repeated batches. In average values, a production of 51.6 g l−1, a productivity of 0.43 g l−1 h−1 and a yield of 0.71 g g−1 were attained in each batch, variation coefficients being smaller than 10%.

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Abbreviations

D :

diameter of the Ca-alginate beads (mm)

P :

xylitol concentration (g l−1)

Q P :

xylitol productivity [Q P  = P/t] (g l−1)

S :

xylose concentration (g l−1)

t :

fermentation time (h)

V :

volume of individual Ca-alginate beads (mm3)

V I :

volume of Ca-alginate beads in the reactor (l)

V M :

volume of fermentation medium in the reactor (l)

V R :

volume of reactor [V R  = V I  + V M ] (l)

X I :

concentration of immobilized cells in the Ca-alginate beads (g l−1)

X M :

concentration of free cells in the fermentation medium (g l−1)

X R :

concentration of cells in the reactor (g l−1)

X RI :

concentration of immobilized cells in the reactor (g l−1)

X RI% :

percentage of immobilized cells in the reactor (%)

X RM :

concentration of free cells in the reactor (g l−1)

Y P/S :

xylose to xylitol bioconversion yield [Y P/S  = ΔP/ − ΔS] (g g−1)

μ P :

specific rate of xylitol production (g g−1 h−1)

μ S :

specific rate of xylose consumption (g g−1 h−1)

μ XR :

specific rate of cell growth (h−1)

μ XRI :

specific rate of immobilized cell growth (h−1)

μ XRM :

specific rate of free cell growth (h−1)

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Acknowledgments

The authors gratefully acknowledge the financial support of Fapesp and CNPq.

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Authors and Affiliations

  1. Departamento de Biotecnologia, Escola de Engenharia de Lorena, Estrada Municipal do Campinho s/n, CEP 12.602-810, Lorena, SP, Brazil

    Walter Carvalho, Larissa Canilha & Silvio S. Silva

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  1. Walter Carvalho
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  2. Larissa Canilha
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  3. Silvio S. Silva
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Correspondence to Walter Carvalho.

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Carvalho, W., Canilha, L. & Silva, S.S. Semi-continuous xylose-to-xylitol bioconversion by Ca-alginate entrapped yeast cells in a stirred tank reactor. Bioprocess Biosyst Eng 31, 493–498 (2008). https://doi.org/10.1007/s00449-007-0187-z

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  • DOI: https://doi.org/10.1007/s00449-007-0187-z

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