New Giveaway - Wort Monster Conical Fermenter!

Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > Wyeast 1728 and apparent attenuation




Reply
 
LinkBack Thread Tools Display Modes
Old 01-30-2013, 02:34 AM   #1
techprof
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jul 2011
Location: plano, il
Posts: 33
Liked 1 Times on 1 Posts

Default Wyeast 1728 and apparent attenuation

Just too a sample of a wee heavy, with an OG of1.085 multiple readings. After 9 days of fermentation it is at 1.012@ 67f. Ferm temps started at 63f and at one week bumped up 2f each day.

Flavor and aroma is what is expected but the gravity reading seems too low for this yeast. I did pitch a very healthy 2L starter and within 6 hrs fermentation started.

My sample was taken from the top 2-3 inches of bucket. Could that cause misreading?



__________________
techprof is offline
 
Reply With Quote Quick reply to this message
Old 01-30-2013, 03:51 PM   #2
stpug
HBT_SUPPORTER.png
Feedback Score: 0 reviews
Recipes 
 
Join Date: Nov 2012
Posts: 2,068
Liked 279 Times on 242 Posts
Likes Given: 127

Default

That's pretty high attenuation for that strain (typically 73-77% AA). You're sitting about 10% higher than average. I have noticed higher attenuation on multiple re-generations with this strain, and will typically get higher attenuation with large starters and yeastcakes. These factors coupled with a low mash temperature (what was your mash temp?) and well-managed fermentation temp schedule could push the AA a bit higher than manufacturers suggested range. I would say that if the flavor and aroma is what you expected then you're good. I wouldn't expect a shallow sample to cause an off reading, but you can certainly take another reading at bottling time to compare.



__________________
stpug is offline
 
Reply With Quote Quick reply to this message
Old 01-30-2013, 11:59 PM   #3
techprof
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jul 2011
Location: plano, il
Posts: 33
Liked 1 Times on 1 Posts

Default

Mash temp was 156f @60min. The grain bill was 15lbs 2row and. 5lb roasted barley. Mash vol 5gals, and batch sparge with 5g with 175f water. I collected a total of 8.8g water and boiled for 3hrs down to 5.25g. Cooled wort and refractometer showed 1.92. I then added my 2l starter, OG down to 1.085 for total volume 5.75g.

I could have boiled for another 30min to lower volume.

__________________
techprof is offline
 
Reply With Quote Quick reply to this message
Old 01-31-2013, 12:03 AM   #4
techprof
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jul 2011
Location: plano, il
Posts: 33
Liked 1 Times on 1 Posts

Default

.5 lb roasted barley...total 15.5lbs.

__________________
techprof is offline
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options
Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
apparent vs actual attenuation Bumpasourus Fermentation & Yeast 8 11-01-2012 01:54 PM
87.69% Apparent Attenuation even possible? Cold Country Brewery Fermentation & Yeast 4 02-21-2012 04:17 PM
apparent attenuation aragornss All Grain & Partial Mash Brewing 1 07-16-2011 01:33 PM
92% Apparent Attenuation! fellbrew Fermentation & Yeast 2 02-20-2011 10:38 PM
90% Apparent Attenuation? hialtitude Extract Brewing 3 03-21-2007 06:02 PM