Sparkling wine production

Question 1

What are the desirable qualities for a sparkling wine tirage yeast?
(Exam question)

Answer 1

• ferments at low temperatures (15-16C)
• Ethanol tolerance (approx 11.5%)
• SO2 tolerance up to 15ppm FSO2.
• can ferment at low pH down to 2.9
• doesn’t produce off characters such as H2S
• the desired level of autolysis.
• flocculates well.

Question 2

What is the conversion factor for the amount of Cu(II) in copper sulphate pentahydrate?

Answer 2

M.w. Of Cu =63.546
M.W of CuSO4.H2O=249.68

Factor is 0.255