664748
Description
Mind Map by alice.finlay, updated more than 1 year ago
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Created by alice.finlay
over 10 years ago
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Fermentation
- It is a process
used to produce
alcohol e.g. beer
and wine. The
microbe used is
yeast
- Main stages of fermenting yeast
- 1. Extract sugar
- 2. Add yeast
- 3. Adjust temperature for yeast growth
- 4. Ferment mixture into airtight container to
prevent entry of air and microorganisms
- 5. Clarify beer (makes yeast settle)
- 6. Draw out the alcohol
- 7. Pasteurise and bottle the beer
- 7. Pasteurise and bottle the beer
- 6. Draw out the alcohol
- 5. Clarify beer (makes yeast settle)
- 4. Ferment mixture into airtight container to
prevent entry of air and microorganisms
- 3. Adjust temperature for yeast growth
- 2. Add yeast
- 1. Extract sugar
- The breakdown of sugar by yeast in the absence of oxygen =
anaerobic respiration
- sugar -> ethanol + carbon dioxide + energy
- C6H12O6 -> 2C2H5OH +2CO2
- If oxygen is present = aerobic respiration
- sugar + oxygen -> water + carbon dioxide
- sugar + oxygen -> water + carbon dioxide
- If oxygen is present = aerobic respiration
- C6H12O6 -> 2C2H5OH +2CO2
- sugar -> ethanol + carbon dioxide + energy
- Yeast and Alcohol
- Different strains of
yeast give alcohol
different flavours
and strengths
- Usually the high
concentration of
alcohol produced
by the yeast cells
kills them making
the drink safe for
humans
- Yeast that can
tolerate high levels
of alcohol are used
to produce drinks
with a higher alcohol
content e.g. vodka
- Different strains of
yeast give alcohol
different flavours
and strengths
- Effect of temperature on yeast
- For every 10 degree celcius rise, the yeast doubles
- Until it reaches the optimum and then the yeast decreases
- This is because the enzymes are denaturing
- This is because the enzymes are denaturing
- Until it reaches the optimum and then the yeast decreases
- For every 10 degree celcius rise, the yeast doubles
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