Day 3 Flashcards
Ale yeaste
Topfermenting saccharomyces cervisiae, warmer tempeture
Lager yeast
bottom fermenting, saccharomyces pastoranis os carlsbergensis 8-16 grader
What is flocculation?
yeaste aggregates in clumps and sediment
What is flocculation?
yeaste aggregates in clumps and sediment, dependent on temperature, oxygen, and CO2 content
What is flocculation?
yeaste aggregates in clumps and sediment, dependent on temperature, oxygen, and CO2 content
Positive and negatives by flocculation
Positive: removal og yeast, collection of yeast. Negative: Premature floculation –> poor maturation and high diacetyl levels, delayed flocculations–> off-flavours filtration
What does crabtree positive mean?
They produce ethanol indstesd of only reprodction. Even if there is oxygen available
Why does yeast need oxygen
to produce sterols for reproduction
Why does yeast need oxygen
to produce sterols for reproduction
What does crabtree positive mean?
They produce ethanol indstesd of only reprodction. Even if there is oxygen available. happens at 4g/l glucose
Why does yeast need oxygen
to produce sterols for reproduction
yeast most important properties
ethanol, esters, diacetyl
What does higer tempeture do to the yeast and ester production?
more yeast and more esters
Normal pitching rate for yeast
10-18 mio cells /ml wort
