We Use Yeast for Brewing Beer Flashcards
1) What do you need to do first?
Get sugar out of the grain
1) What is beer made from?
Grain - usually barley
1) What are the barley grains allowed to do?
Germinate for a few days
1) What does the starch do whilst the grains germinate?
Break down into sugar by enzymes
1) What is then done to the grains?
They are dried in a kiln
1) What is malting?
Malting is a process of steeping, germinating and drying grain to convert it into malt.
1) What is then done to the malted grain?
It is mashed up and water is added to produce a sugary solution with lots of bits in it
1) What is then done to the sugary solution?
It is sieved to remove the bits
1) What’s added to the mixture to give the beer its bitter flavour?
Hops
2) What is done second?
Yeast is added and the mixture is incubated. The yeast ferments the sugar into alcohol.. the fermenting vessels are designed to stop unwanted microorganisms and air getting in
2) What starts to kill the yeast?
The rising conc of alcohol (ethanol) in the fermentation mixture due to anaerobic respiration
2) what happens as the yeast dies?
Fermentation slows down
2) what can different species of yeast tolerate?
Different levels of alcohol
2) What can some species be used to produce?
Strong beer with a high conc of alcohol
3) what is done third?
The beer is drawn off through a tap
Sometimes chemicals called clarifying agents are added to remove particles and make it clearer
