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Question
Name the enzymes and write the reactions involved in the preparation of ethanol from sucrose by fermentation.
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Solution
Ethanol, C2H5OH, is obtained commercially by fermentation, the oldest method is from sugars. The sugar in molasses, sugarcane or fruits such as grapes is converted to glucose and fructose, (both of which have the formula C6H12O6), in the presence of an enzyme, invertase. Glucose and fructose undergo fermentation in the presence of another enzyme, zymase, which is found in yeast.
\[\ce{\underset{Sugar}{C12H22O11} + H2O ->[Invertase] \underset{Glucose}{C6H12O6} + \underset{Fructose}{C6H12O6}}\]
\[\ce{\underset{Glucose/Fructose}{C6H12O6} ->[Zymase] \underset{Ethanol}{2C2H5OH} + 2CO2}\]
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