Filtration Flashcards
1
Q
What are collagens and how do they work?
A
Proteins with a net positive charge (gelatin and isinglass)
Attract to yeast and tannins due to their negative charge
2
Q
What are carrageenan and how do they work?
A
Irish moss and whirlfloc
Carry a net negative charge in the boil
Cause proteins to coagulate in the boil
3
Q
What is a bubble point test?
A
A filter membrane integrity test. The filter is wetted and drained, then pressure is added to the inlet until bubbles start escaping the outlet in a bucket of water. Bubbles before reaching manufacturers set pressure indicate a failed membrane.
4
Q
What filter size is considered sterile filtration?
A
0.2 microns
5
Q
What is pvpp?
A
Filtering aid that adsorbs polyphenols.
Requires DE filtration after use
