Vitality

Definition:
“Yeast Activity or Physiological Health”
Or “Potential To Endure Stress and Still Perform”

How Can We Measure Yeast Vitality?
1. Glycolytic Flux
• pH
2. Cellular Components
• Glycogen
• Sterols
• Trehalose

Acidification Power Test
• Based on capacity of yeast slurry to acidify
surrounding medium.
• acidification power test measures the reduction in
extra-cellular pH before and after glucose addition
• The "acidification power" test serves as an indicator of the
yeast cells physiological condition