Reaction Engineering Aspects of α-1,4-d-Glucan Phosphorylase Catalysis

Comparison of Plant and Bacterial Enzymes for the Continuous Synthesis of d-Glucose-1 -Phosphate
  • Bernd Nidetzky
  • Richard Griessler
  • Andreas Weinhäusel
  • Dietmar Haltrich
  • Klaus D. Kulbe
Chapter
Part of the Applied Biochemistry and Biotechnology book series (ABAB, volume 63-65)

Abstract

Some important process properties of α-1,4-d-glucan phosphorylases isolated from the bacterium Corynebacterium callunae and potato tubers (Solanum tuberosum) were compared. Apart from minor differences in their stability and specificity (represented by the maximum degree of maltodextrin conversion) and a 10-fold higher affinity of the plant phosphorylase for maltodextrin (K M of 1.3 g/L at 300 mM of orthophosphate), the performances of both enzymes in a continuous ultrafiltration membrane reactor were almost identical. Product synthesis was carried out over a time course of 300–400 h in the presence or absence of auxiliary pullulanase (increasing the accessibility of the glucan substrate for phosphorolytic attack up to 15–20%). The effect of varied dilution rate and reaction temperature on the resulting productivities was quantitated, and a maximum operational temperature of 40°C was identified.

Index Entries

α-1,4-d-Glucan phosphorylase Corynebacterium callunae Solanum tuberosum α-D-glucose-1-phosphate continuous production 

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Copyright information

© Humana Press Inc. 1997

Authors and Affiliations

  • Bernd Nidetzky
    • 1
  • Richard Griessler
    • 1
  • Andreas Weinhäusel
    • 1
  • Dietmar Haltrich
    • 1
  • Klaus D. Kulbe
    • 1
  1. 1.Division of Biochemical Engineering, Institute of Food TechnologyUniversität für Bodenkultur WienViennaAustria

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