Factors Affecting Fermentation of Glucose by Yeast

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  • Topic: Yeast, Ethanol, Adenosine triphosphate
  • Pages : 2 (578 words )
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  • Published : March 30, 2011
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Factors Affecting Fermentation of Glucose by Yeast

Fermentation is anaerobic respiration whereby food is altered into more simple compounds and energy in the form of chemicals is produced, an example being adenosine triphosphate (biology-online.org/dictionary/Fermentation). All this occurs with the lack of atmospheric oxygen. At the end of the day alcohol and carbon dioxide are the end products when yeast is used in the fermentation procedure. But end products like acetic acid or lactic acid can also be gained depending on the circumstances. The salinity, air conditions, temperature, pH of the system, the enzyme systems of microorganisms, and the type of sugars being fermented can show a variety in the type of end products produced. In this study the tube with the highest amount of chlorine is added, an increase in the rate of fermentation should be observed. Methods and Materials:

100ml of the stock solution of 10% glucose was placed into four separate beakers. Each beaker was labeled “1 (control),” “2 (5 drops),” “3 (10 drops),” and “4 (15 drops)”. Five drops of 6% sodium hypochlorite was added to beaker #2, 10 drops to beaker #3, and 15 drops to beaker #4. The contents of the yeast suspension were then stirred thoroughly to be sure the yeast cells were suspended and not settled at the bottom and to each solution 50ml of the yeast suspension was added. The contents of each beaker were stirred with a glass stirring rod to mix the solutions thoroughly. Each of the four fermentation tube bowls were filled with one of the solutions and the tubes were tilted so that the vertical arm was full, but the bowl was nearly empty. Each fermentation tube was labeled in order to indicate its contents. The tubes were placed in a warm place (in an incubator or near a heat lamp). Every 10 minutes for 90 minutes a measurement was made and the amount of gas produced in each of the four fermentation tubes was recorded and graphed. Results:

Figure 1
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