RESTART AND/OR COMPLETE A STUCK FERMENTATION
The successful restart of a stuck fermentation depends upon three critical factors:
- Diagnose the causes of fermentation arrest.
- Appropriate wine treatment.
- Proper acclimation of the yeast.
1. TREAT THE STUCK WINE BEFORE THE RESTART – 24 HOURS PRIOR TO YEAST PREPARATION
- Press off skins.
- Adjust pH, Alcohol, VA.
- Remove spoilage microbes with Enartis Stab Micro M at 15 g/hL
- Rack off lees 24 hours after treatment and add Nutriferm No Stop at 20 g/hL.
2. PREPARE AND ACCLIMATE THE YEAST
STEP 1: Prepare starter
Tip: Use a sanitized tank able to hold the entire volume of stuck wine.
- Take 2.5 % of stuck wine.
- Add the same amount of water (2.5% of total volume).
- Add 10 g/hL of Nutriferm Energy (calculated on the volume of stuck wine).
- Adjust sugar level to 50 g/L (5°Brix).
- Maintain temperature at 20-23°C.
STEP 2: Yeast rehydration
Rehydrate 30 g/hL (calculated on the volume of stuck wine) of Enartis Ferm EZ FERM 44 in 10 times its weight of chlorine-free water at 40°C and wait 20 minutes.
STEP 3: Acclimate the yeast and start fermentation
- Add rehydrated yeast to STEP 1 and monitor °Brix and Temperature.
- At 1/2 °Brix depletion, add 20% of stuck wine + 5 g/hL of Nutriferm Special (calculated on volume of stuck wine).
- At 1/2 °Brix depletion, add another 20% of stuck wine.
- At 1/2 °Brix depletion, add the remaining stuck wine.
3. PRODUCT NEEDS FOR 100 hL
| WINEMAKING PRODUCT | QUANTITY (kg) |
|---|---|
| Stab Micro M | 1.5 |
| Nutriferm No Stop | 2 |
| Enartis Ferm EZFerm 44 | 3 |
| Nutriferm Energy | 1 |
| Nutriferm Special | 0.5 |
Why use Nutriferm No Stop?
Nutriferm No Stop acts as a protector by improving yeast membrane integrity. Additionally, it eliminates medium chain fatty acids and pesticides residues which may inhibit fermentation.
Why use Nutriferm Energy?
Nutrient content in stuck wine cannot support yeast growth. Complex yeast nutrients improves yeast activity and facilitates their acclimation to hostile wine conditions. Nutriferm Energy provides essential elements for yeast development.
Why using Enartis Ferm EZFerm 44?
It is a fructophilic yeast, vigorous fermenter with low nutrition needs. It has high implantation rate and strong resistance to alcohol and VA.
