HOMEBREW Digest #5649 Tue 19 January 2010

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  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 Return to table of contents
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 Return to table of contents
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