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Related Experiment Videos

Yeast flocculation: kinetics and collision theory.

M Stratford1, M H Keenan

  • 1Institute of Food Research, Norwich Laboratory, U.K.

Yeast (Chichester, England)
|September 1, 1987
PubMed
Summary
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Mechanical energy is essential for yeast flocculation, with rates increasing exponentially with shaking speed. Higher pH values necessitate greater energy input, suggesting activation energy overcomes cell repulsion for bond formation.

Area of Science:

  • Biotechnology
  • Biochemistry
  • Microbiology

Background:

  • Flocculation is a crucial process in yeast cell aggregation.
  • Understanding the physical parameters influencing flocculation is vital for industrial applications.

Purpose of the Study:

  • To investigate the role of mechanical energy in yeast flocculation.
  • To determine the relationship between energy input, cell concentration, shaking speed, and pH on flocculation rates.
  • To elucidate the energetic requirements for overcoming cell-cell repulsion during flocculation.

Main Methods:

  • Yeast cells were subjected to controlled mechanical agitation.
  • Flocculation rates were measured under varying cell concentrations and shaking speeds.
  • The effect of pH on the minimum shaking speed and activation energy was analyzed.

Related Experiment Videos

  • Arrhenius-like plots were used to determine activation energy.

    • Main Results:

    • Flocculation requires a minimum mechanical energy input and ceases upon its removal.
    • The initial flocculation rate is proportional to the square of cell concentration.
    • Flocculation rate increases exponentially with shaking speed above a minimum threshold.
    • The minimum shaking speed and activation energy for flocculation are pH-dependent.

    Conclusions:

    • Mechanical energy is a critical determinant of yeast flocculation.
    • Activation energy is necessary to overcome electrostatic repulsion between yeast cells, facilitating the formation of flocculent bonds.
    • pH significantly influences the energy requirements for yeast cell aggregation.