Lesson 4 - Grape Flashcards
1
Q
Name the two attributes for grape fermentation
A
High starting sugar concentration
Low pH
2
Q
What is the starting sugar
A
19 brix
3
Q
What is the starting pH
A
Under 4
4
Q
What can too high YAN produce
A
Adding too many nutrients can cause more fusel oil to be produced, effecting flavour
5
Q
What is the height to width ratio of a fermentation vessel
A
2:1
6
Q
Why are fermentation time high
A
High sugar content
Low pH
Nutrient deficit
Spontaneous fermentation causing a larger lag phase
7
Q
What is malolactic fermentation
A
Malortic acid is reacted to form lactic acid and carbon dioxide
8
Q
A
9
Q
What Bacteria causes malolactic reactions
A
Oenococus oeni
10
Q
A
