Summary
The ability of alginate-entrapped microorganisms to supply oxygen was determined with regard to physiology and growth behavior of the cells. Oxygen diffusion through an alginate film containing different concentrations of Pseudomonas putida or Saccharomyces cerevisiae was measured. Oxygen diffusion decreased when the cell loading increased. Dependent on the physiological behavior of these organisms the course of the oxygen concentration under the gel film is quite different. In further experiments an “Effectiveness-Factor” of oxygen uptake of alginate beads with Saccharomyces cerevisiae or Aspergillus niger was determined in relation to the growth behavior of the organisms. The effectiveness factor is always higher when the biomass is concentrated in the outer region of the gel beads as if the microorganisms are distributed homogeneously in the alginate. Considering these results it is not possible to make a general statement on the ability of microorganisms in alginate to supply oxygen. The physiology and the growth behavior of the immobilized organisms have to be considered in any case.
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Gosmann, B., Rehm, HJ. Influence of growth behaviour and physiology of alginate-entrapped microorganisms on the oxygen consumption. Appl Microbiol Biotechnol 29, 554–559 (1988). https://doi.org/10.1007/BF00260984
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DOI: https://doi.org/10.1007/BF00260984