how is ethanol produced by fermentation?

Answer 1

fermentatiopn is the gradual or slow decomposition by micro organism of large organic molecules(STARCH) into smaller ones(ethanol)

STAGE1;starch granules are first extracted by crushing oir pressure cooking satrchy food materials like cereals or potatoes.

STAGE 2;it is then treated with malt at room temperature of 50-60 degree celcius for about an hour.malt is a partialy germinating barely which contain an enzyme called diastase which act on starch and converts it to maltose
2(C6H10O5)n+nhH20---->2C12H22011

STAGE 3;yeast is then added.yeast contain two enzymes
A)maltase which act on maltose and converts it into glucose
C12H22011+H20--->2C6H12O6

B)zymase which then act on glucose to converts it itno ethanol and carbon (IV)oxide
C6H12O6---->2C2H5OH+2CO2

Answer 2

brewer's yeast. eg, saccharomyces

first you obtain a sugary solution that you want to ferment, say hops and barley solution. then you add some yeast, seal the mixture, warm at 37-38 degrees celcius, and the magic happens.

yeast respirate anaerobically, consuming sugars and producing ethanol as a waste product. the moment oxygen enters the system, the fermentation stops and the process halts, so you dont really open the tank every now and then to check. a regular beer fermentation process can take a week to 10 days.

in alcoholic brewing, maximum alcohol level in a fermenting tank tops off at around 12 or 13% v/v. at this level, the high ethanol levels kill all the yeast. its a pretty handy convenience.

any higher alcohol beverage manufactured is produced by distilling the mix over and over to increase the alcohol content.

Answer 3

May be you should rephrase you question It is not very clear what you want to know. Yeast is a type of vegetative living thing which does its work based on the commands of its genetic cell form so nothing is an advantage for the poor yeast.

Answer 4

from glucose the yeast will produced ethanol anaerobically...
C6H12O6(glucose)--->2C2H5OH + 2CO2

the ethanol concentration will not exceed 20% or the yeast will die. Further concentration ethanol is obtained by distillation.

Answer 5

C6H12O6 + yeast ---> 2CO2 +2 CH3CH2OH

glucose + yeast--->carbon dioxide + ethyl alcohol