04-10-2010, 10:13 PM
Join Date: Mar 2010
| | Re: Tiny super efficient CO2 reactor
Yeast need nutrient. A tablespoon or two per bottle of yeast extract, vegemite, powdered milk or soybean, egg white, or basically anything readily soluble that contains protein, phosphate, and vitamin c. I heat kill yeast in lemon juice then freeze to make my yeast nutrient.
If you don't give your yeast nutrients beyond sugar, then they won't have the resources to multiply and colonize vigorously. Sometimes, this will result in fermentation starting then fading quickly, a stuck fermentation as they call it in brewing.
Also, I strongly second the recommendation for wine yeast. Nothing beats it for longevity and productivity.