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Contents:
RE: Pitching Yeast (donniestyle)
BABBLE Brew-Off 2010 ("Dan Morey")
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Date: Tue, 19 Jan 2010 09:42:50 -0600 (CST)
From: donniestyle at directlink.net
Subject: RE: Pitching Yeast
My recent yeast pitch rates are based on George Fixx's Recommended Pitch
Rates. Dr Fixx recommended 750,000*(mL of Wort)*(Deg Plato of Wort) for
ale, and twice as much for lager. Doing the math for your 1 gallon 1.053
batch, you get 3800 * 750,000 * 13.25 = 37,762,500,000 yeast cells. Using
the Propagator as previously noted you'll have 25,000,000,000 cells, and
assuming freshness and optimal handling and storage, a propagator would
probably be enough yeast for your test batch. With most of the other
yeast packaging available today you would be over pitching by almost 2 to
more than 3 times the amount needed, so avoid that by either not using all
of it (discarding some), making more beer (2 gal), or saving the
remainder. You can also weigh out dry yeast from packages to get the
estimated cells you require. Use calculations for the number of cells as
outlined below.
I have one question also. I've read before some claims a much higher cell
count in a dry yeast sachet, but my math does not calculate the same
numbers. Are the claims I've read (up to 224,000,000,000 yeast cells in a
dry yeast package) correct? I don't recall any such retail packaging.
I've seen 6*10^8 or 6*10^9 for cells per gram, and package sizes range
from 6 to 11.5 grams. I calculate the number of cells in a dry yeast
packet as follows, with the numbers from the yeast manufacturers data
sheets.
Package size: 11.5 grams
Cells/gram: 6 * 10^9 cells per gram
Total cells: 6 * 10^9 * 11.5 = 69,000,000,000 cells
Using Dr Fixx's pitching recommendations, this amount is sufficient for 5
gallons of about a 1.040 ale or 2.5 gallons of lager at the same OG. Yes,
the recommendations are for re-pitched yeast. Yes, current manufacturers
claim that and also that fresh yeast pitching rates are not much lower
(and would not attribute to over pitching issues).
Cheers,
Don
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Date: Tue, 19 Jan 2010 19:46:13 -0600
From: "Dan Morey" <dan-at-morey.us at comcast.net>
Subject: BABBLE Brew-Off 2010
This is an invitation to participate in the BABBLE Brew-Off 2010 Saturday,
February 27, 2010 at DiCarlo's Fine Wines & Spirits in Mundelein, IL.
Entries will be accepted starting February 1st.
BABBLE is proud to announce that the Brew-Off will again be a stop on the
Midwest Homebrewer of the Year circuit http://www.sphbc.org/mwhboy/
We are also pleased to bring you our Entrant Appreciation Drawing. The name
of one participant will be selected at random and this person will win a
special gift package. Each entry qualifies you in the drawing, so the more
you submit the better your chances at winning!
There will be a separate best of show judging for Meads and Ciders. Ribbons
will be awarded for 1st, 2nd and 3rd best of show in these categories so
dust off some of those bottles and take a chance on winning more ribbons.
Rules and entry forms can be found on the BABBLE website
www.babblehomebrewers.com
If you are interested in Judging, please contact Bruce Dir and Stewarding,
Steve Pavlovich. You can contact both by emailing brewoff at
babblehomebrewers.com (just eliminate the spaces).
We have many fine sponsors which can also be found on our website.
Cheers, Dan
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End of HOMEBREW Digest #5649, 01/19/10
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