What is E2U™?
Easy-to-use (E2U™) is a Fermentis brand used to characterize specific wine and beer yeasts & fermentation solutions which can easily be used in the beverage manufacturing process, without going through complex preparation protocols that complicate the operation. E2U™ is an innovative concept to make your life easier, to save you time, and offer more comfort and safety. In fact, the extension of this brand to our beer range was recently communicated after a study conducted by Fermentis and independent laboratories in 2017. In the study, several trials were made to measure viability, various fermentation parameters (fermentation kinetics, final ethanol production, apparent degree of fermentation, etc.) and volatile compounds production in beers made; using different media (tap water, distilled water, 7°P, 15°P, 25°P wort), different temperatures (8°C/46°F, 12°C/54°F, 16°C/61°F, 20°C/68°F, 32°C/90°F, 40°C/104°F) and different kinds of agitation (without, moderate and violent) to rehydrate yeast, in comparison with direct pitching (moderate agitation at 30°C/86°F). No significant differences were found in this study for our full range of yeasts. You can see the example of the SafAle™ S-33 in Figure 4 on the next page. The study concluded that the performance of our brewing yeasts is not affected when they are rehydrated in different types of media (wort of different strengths, distilled water, tap water, etc.), at different speeds of agitation, and in a wide range of temperatures. Furthermore, it is not affected when they are inoculated directly into the wort, without previous rehydration. The range is E2U™! You can now pitch directly, with no need to rehydrate; but if you still want to rehydrate, you can relax and use different conditions that adjust more to your process, without negative effects. But please… keep in mind that we are still talking about living microorganisms and there are some limits. Use the recommended temperature range for pitching (check the back of the sachet) and if you have always rehydrated Fermentis ADY, again, you can still do it, but do it preferably with hopped wort that will protect the yeast against microbial contamination. Last but not least, there is no need to oxygenate the wort when using E2U™ yeast by Fermentis (due to our production process) and DO NOT shake the flask extremely vigorously when you are rehydrating the yeasts. Our ADY are ready to go when you pitch them!
What is the Best Before End Date (BBE) of E2U™ Fermentis ADY?
Best Before End Date for Fermentis yeasts is three years from production date which was established in 2016. Study results showed that in beers made with yeast exposed to forced aging tests, and almost 4 years of natural (true) aging, the performance and sensorial profile is not affected negatively, for either ale or lager strains. In addition, the temperatures of storage studied (-20°C/-4°F, 5°C/41°F, 25°C/77°F) do not affect the ale yeasts in any way, how- ever there can be longer fermentation (2-3 days) for lager yeast that have been stored at ambient temperatures. So our recommendation would be to store lagers strains (Sa- fLager™ W-34/70, SafLager™ S-189, SafLager™ S-23) at or below 10°C (50°F).
Can I use E2U™ Fermentis ADY after multiple generations?
Yeast recycling is something you can do with E2U™ Fermentis yeast, it is your decision. Keep in mind that yeast management requires laboratory equipment and knowledge to validate the quality of the cropped yeast as genetic drift can happen over time impacting several parameters in your beer, such as fermentation kinetics and volatile compounds produced. Our recommendation is to limit repitching to no more than 4-6 times (for any yeasts, not only Fermentis) and always check the quality of the cropped yeast. Again, the fact that you are using dry yeast does not mean you cannot recycle the culture. What is important is to check, when recycling yeast, the presence of beer spoilage microorganisms and that is something our E2U™ yeasts are controlled against from our yeasts bank and through the production process.
What is the recommended pitch rate for E2U™ Fermentis ADY?
Active Dry Yeast is dry yeast biomass with no free water molecules (94-97% dry matter). A pitch rate in weight per volume (grams per hectoliter) is the most accurate way, for ADY, to achieve consistency in your fermentations time after time. For E2U by Fermentis ale strains we recommend a pitch rate of 50-80 gr/hL (2.06-3.3 oz/bbl); and 80-120 gr/hL (3.3-4.95 oz/bbl) for our lagers strains. In other words, one 11.5grs sachet (0.406 oz) is good for 5 gallons for ales and two 11.5g sachets for 5 gallons for lagers. For high gravity beers (over 18°P) it is better to pitch 2 sachets per 5 gallons brew.