Google+

Blinded bt Science: Do your yeast get proper nutrition?

Leave a comment

June 26, 2015 by fhsteinbart


Here we see a simple two step protein mash schedule.  The first step being the protein rest, the second step the saccharification rest.

Here we see a simple two step protein mash schedule. The first step being the protein rest, the second step the saccharification rest.

For years, brewers have asked for lower protein malted barley’s for brewing beer. While the farmers were more than happy to cooperate with this venture, and the maltster’s also contributed to the lower protein demands of brewers, there’s a caveat  For if you decrease the protein, you also decrease the free amino nitrogen. Free amino nitrogen (FAN) is essential for proper yeast growth and development.  Without sufficient FAN, the yeast will have insufficient food for proper growth and development, and may result in a stuck fermentation, or even worse still, an abnormal fermentation.  Yeast need approximately 150 parts per 1,000,000 (PPM) or 150 mg per liter of FAN in wort in order to have the optimal amount nutritional needs met.  Unfortunately, we need decrease the levels of protein in barley and consequently and malt, you also decrease the FAN.  Since most home brewers do not use a protein rest in brewing are all green beers, yeast nutrient must be added to compensate for the decrease level of FAN.  Doing a protein rest will encourage the formation of free amino nitrogen, which would be sufficient supplementation for the yeast.  So the basic choice comes down to either doing a protein rest, or adding yeast nutrient to the wort.  While the former is more preferred, the latter is just as effective and will save time, energy, and make for a simpler brew day.

Advertisements

Please Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

Enter your email address to follow this blog and receive notifications of new posts by email.

Join 2,754 other followers

beer sensory science

Dedicated to understanding the science of beer flavor

The Apartment Homebrewer

Brewing small batches of craft beer in a 650 sqft apartment

World's Oldest Home Beer & Wine Supply Store

Seacoast Beverage Lab

World's Oldest Home Beer & Wine Supply Store

The Not So Professional Beer Blog

World's Oldest Home Beer & Wine Supply Store

The Beer Here

World's Oldest Home Beer & Wine Supply Store

Beervana

World's Oldest Home Beer & Wine Supply Store

-=BrewmanceNW=-

World's Oldest Home Beer & Wine Supply Store

#pdxbeergeeks

World's Oldest Home Beer & Wine Supply Store

BREWPUBLIC.com

World's Oldest Home Beer & Wine Supply Store

%d bloggers like this: