Fermentation 1 Power Point Presentation

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2 Pasteur¶s definition: ³life without air´, anaerobe redox

reactions in organisms New definition: a form of metabolism in which the end

products could be further oxidized For example: a yeast cell obtains 2 molecules of ATP per molecule of glucose when it ferments it to ethanol ÷

2 Techniques for large-scale production of microbial products. It must both provide an optimum environment for the microbial synthesis of the desired product and be economically feasible on a large scale. They can be divided into surface (emersion) and submersion techniques. The latter may be run in batch, fed batch, continuous reactors In the surface techniques, the microorganisms are cultivated on the surface of a liquid or solid substrate. These techniques are very complicated and rarely used in industry O

2 In the submersion processes, the microorganisms grow in a liquid medium. Except in traditional beer and wine fermentation, the medium is held in fermenters and stirred to obtain a homogeneous distribution of cells and medium. Most processes are aerobic, and for these the medium must be vigorously aerated. All important industrial processes (production of biomass and protein, antibiotics, enzymes and sewage treatment) are carried out by submersion processes. á

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Fermentation 1 Power Point Presentation

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