Rehydrating dried yeast

Discuss making up beer kits - the simplest way to brew.
User avatar
Northern Brewer
Piss Artist
Posts: 204
Joined: Tue Nov 20, 2018 5:57 pm

Re: Rehydrating dried yeast

Post by Northern Brewer » Thu Apr 09, 2020 12:46 am

guypettigrew wrote:
Tue Apr 07, 2020 6:38 pm
No, I don't have the book, and don't know the web site. Any chance of a precis, Orlando?
Summary? Chris White, founder of one of the main companies producing liquid yeast, thinks dry yeast is not as good as liquid yeast.

It's complicated - not least because the likes of Fermentis are aware that many of their customers have rehydration written into their operating practices and it would inconvenience those customers for Fermentis to come out unambiguously in favour of not rehydrating. But it's fairly clear that for anyone not constrained by SOPs, Fermentis don't think rehydrating is worth it for their E2U yeast (ie pretty much all their beer strains).

guypettigrew
Even further under the Table
Posts: 2626
Joined: Mon Mar 22, 2010 7:10 pm
Location: Christchurch, Dorset

Re: Rehydrating dried yeast

Post by guypettigrew » Thu Apr 09, 2020 9:04 am

orlando wrote:
Wed Apr 08, 2020 11:03 am
They didn't find it did..

This comment is probably the reason and a reasonable conclusion:

"Many of the brewing texts that recommend rehydration were written quite awhile ago, and a lot has changed over the years. It’s entirely possible ingredient quality and standard brewing practices have improved such that the dry yeast of today is hardier and less likely to suffer from the potential negative effects of direct pitching. Alternatively, maybe the different pitching methods did produce a difference and tasters simply weren’t able detect it to significant degree. Either way, with my results corroborating Marshall’s initial findings, I’m inclined to continue skip the rehydration step and pitch dry yeast direct directly into the wort, even if it means slightly longer lag."
Thanks for that link, Orlando. Fascinating read.

Guy

User avatar
FUBAR
Lost in an Alcoholic Haze
Posts: 737
Joined: Wed Jan 13, 2010 10:12 pm
Location: Lenham Kent

Re: Rehydrating dried yeast

Post by FUBAR » Thu Apr 09, 2020 9:49 am

I have found without doubt that rehydrated yeast gets to work quicker , the fermentation is more vigorous and thorough than a straight pitch onto wort .
I buy my grain & hops from here http://www.homebrewkent.co.uk/


I have taken more out of alcohol than alcohol has taken out of me - Winston Churchill

User avatar
orlando
So far gone I'm on the way back again!
Posts: 7197
Joined: Thu Nov 17, 2011 3:22 pm
Location: North Norfolk: Nearest breweries All Day Brewery, Salle. Panther, Reepham. Yetman's, Holt

Re: Rehydrating dried yeast

Post by orlando » Thu Apr 09, 2020 10:46 am

mooncat wrote:
Wed Apr 08, 2020 4:48 pm
I always rehydrate dried yeast. With an 11gm packet I put in a sanitised bottle and add 250ml of 20c water.

Did you mean 30c? The recommendation is usually 30-35c. Also 10 ml per gram.

Lallemand's recommendation is:

"Sprinkle the yeast on the surface of 10 times
its weight in clean, sterilized water at 30-35°C"
I am "The Little Red Brooster"

Fermenting:
Conditioning:
Drinking: Southwold Again,

Up Next: John Barleycorn (Barley Wine)
Planning: Winter drinking Beer

Rookie
Falling off the Barstool
Posts: 3552
Joined: Fri Nov 23, 2007 5:30 pm
Location: Fort Wayne, Indiana

Re: Rehydrating dried yeast

Post by Rookie » Thu Apr 09, 2020 6:47 pm

Northern Brewer wrote:
Thu Apr 09, 2020 12:46 am
guypettigrew wrote:
Tue Apr 07, 2020 6:38 pm
No, I don't have the book, and don't know the web site. Any chance of a precis, Orlando?
Summary? Chris White, founder of one of the main companies producing liquid yeast, thinks dry yeast is not as good as liquid yeast.
Hmmm, the owner of a liquid yeast company says dry yeast is not as good.
I'm just here for the beer.

guypettigrew
Even further under the Table
Posts: 2626
Joined: Mon Mar 22, 2010 7:10 pm
Location: Christchurch, Dorset

Re: Rehydrating dried yeast

Post by guypettigrew » Thu Apr 09, 2020 7:27 pm

Rookie wrote:
Thu Apr 09, 2020 6:47 pm
Hmmm, the owner of a liquid yeast company says dry yeast is not as good.
Obviously a completely unbiased opinion, based on years of research, no doubt.

Personally I prefer liquid yeast. Allows me to faff about making a starter three days before brewing and then watching it closely to make sure it's doing something.

Guy

sandimas
Steady Drinker
Posts: 52
Joined: Sat Oct 15, 2016 11:29 am
Location: Near Malvern

Re: Rehydrating dried yeast

Post by sandimas » Fri Apr 10, 2020 11:17 am

orlando wrote:
Thu Apr 09, 2020 10:46 am
Did you mean 30c? The recommendation is usually 30-35c. Also 10 ml per gram.
When I started homebrewing I was told never to re-hydrate the yeast in water more the 5C different to the wort temp as it would shock it, so interesting so see this advice from a manufacturer. I always re-hydrate 20-25C, which has worked for me with 170+ brews.

User avatar
orlando
So far gone I'm on the way back again!
Posts: 7197
Joined: Thu Nov 17, 2011 3:22 pm
Location: North Norfolk: Nearest breweries All Day Brewery, Salle. Panther, Reepham. Yetman's, Holt

Re: Rehydrating dried yeast

Post by orlando » Fri Apr 10, 2020 1:16 pm

sandimas wrote:
Fri Apr 10, 2020 11:17 am
orlando wrote:
Thu Apr 09, 2020 10:46 am
Did you mean 30c? The recommendation is usually 30-35c. Also 10 ml per gram.
When I started homebrewing I was told never to re-hydrate the yeast in water more the 5C different to the wort temp as it would shock it, so interesting so see this advice from a manufacturer. I always re-hydrate 20-25C, which has worked for me with 170+ brews.
The difference may only really occur when your asking the yeast do to some heavy lifting, like a high alcohol Beer or a slightly larger batch than usual, or indeed a packet that is approaching or past its sell by date.
I am "The Little Red Brooster"

Fermenting:
Conditioning:
Drinking: Southwold Again,

Up Next: John Barleycorn (Barley Wine)
Planning: Winter drinking Beer

adamzworld
Hollow Legs
Posts: 415
Joined: Thu Nov 21, 2013 12:29 am

Re: Rehydrating dried yeast

Post by adamzworld » Thu Apr 16, 2020 11:54 pm

As an update to my original post, I tried a sample of this today after 11 days in the FV. Tastes pretty good to me so hopefully the yeast didn't cause any off flavours. None that I can taste at this point anyway!

Post Reply