Biotechnology and Bioprocess Engineering:BBE

The Korean Society for Biotechnology and Bioengineering (한국생물공학회)
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The Disruption of Saccharomyces cerevisiae Cells and Release of Glucose 6-Phosphate Dehydrogenase (G6PDH) in a Horizontal Dyno Bead Mill Operated in Continuous Recycling Mode

  • Mei Chow Yen (Department of Process and Food Engineering, Faculty of Engineering, University Putra Malaysia) ;
  • Ti Tey Beng (Department of Chemical and Environmental Engineering, Faculty of Engineering, University Putra Malaysia) ;
  • Ibrahim Mohammad Nordin (Department of Process and Food Engineering, Faculty of Engineering, University Putra Malaysia) ;
  • Ariff Arbakariya (Department of Bioprocess Technology, Faculty of Biotechnology and Molecular Science, University Putra Malaysia) ;
  • Chuan Ling Tau (Department of Process and Food Engineering, Faculty of Engineering, University Putra Malaysia)
  • Published : 2005.06.01
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Abstract

Baker's yeast was disrupted in a 1.4-L stainless steel horizontal bead mill under a continuous recycle mode using 0.3 mm diameter zirconia beads as abrasive. A single pass in continuous mode bead mill operation liberates half of the maximally released protein. The maximum total protein release can only be achieved after passaging the cells 5 times through the disruption chamber. The degree of cell disruption was increased with the increase in feeding rate, but the total protein release was highest at the middle range of feeding rate (45 L/h). The total protein release was increased with an increase in biomass concentration from 10 to $50\%$(w/v). However, higher heat dissipation as a result of high viscosity of concentrated biomass led to the denaturation of labile protein such as glucose 6-phosphate dehydrogenase (G6PDH). As a result the highest specific activity of G6PDH was achieved at biomass concentration of $20\%$(ww/v). Generally, the degree of cell disruption and total protein released were increased with an increase in impeller tip speed, but the specific activity of G6PDH was decreased substantially at higher impeller tip speed (14 m/s). Both the degree of cell disruption and total protein release increased, as the bead loading increased from 75 to $85\% (v/v)$. Hence, in order to obtain a higher yield of labile protein such as G6PDH, the yeast cell should not be disrupted at biomass concentration and impeller tip speed higher than $20\%(w/v)$ and 10 m/s, respectively.

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