[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 488: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 112: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 112: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 112: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 112: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 112: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 112: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 112: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 112: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 112: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 112: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 112: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 112: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 112: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions.php on line 4765: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3891)
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions.php on line 4767: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3891)
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions.php on line 4768: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3891)
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions.php on line 4769: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3891)
The Brewing Forum • View topic - How To . . . Rehydrate Yeast

How To . . . Rehydrate Yeast

If you know how to do something, and how it should be done, tell us here.

How To . . . Rehydrate Yeast

Postby Aleman » Sat Apr 05, 2014 16:28

Hardly the most complex of how to's this one It does surprise me the number of methods that people use, and most of them are not correct . . . . for brewing yeast! Bread yeasts are a completely different animal . . . actually they are not . . . and the requirements are different.

Firstly you need to use the correct amount of water, not wort or a sugar solution but normal tap water . . . preferrably water with a medium to high mineral content. The reason for this is simple, when you add a dehydrated yeast cell into a solution it rapidly absorbs liquid, but the yeast membrane is not selective at this stage and allows 'everything' and 'anything' across the membrane, including all those sugars and minerals. This can cause extreme osmotic stress to the poor yeast cell as it tries to wake up, and it will either end up poorly or could even explode and die, not a good result really, so just medium to high mineral content water.

Secondly the right amount of liquid should be used . . . Fermentis suggest using 10 times the weight of water as yeast, so an 11g sachet of yeast needs 110g of water (which is as near as dammit 110ml), 100g of yeast needs 1000ml

Thirdly, the water, after boiling to ensure sterilisation, needs to be at the correct temperature, and this varies for variety to variety. Nottingham for example needs to be at 36C . . . Fermentis Saflager W34/70 needs 21-25C, . . . SO4 needs 25-29C. Lallemand report a 20% loss in viability compared with rehydrating at 30C instead of 36C . . . and if you are close the limit for under pitching this could be an important factor. DO NOT guess the temperature! Use a thermometer! This is one of the easiest things to do, and guessing wrong will almost certainly kill your yeast.

Fourthly, Sprinkle the yeast onto the surface of the cooled water and stir gently to mix it in . . . I know it just says sprinkle it on and leave it . . . but you need to stir it to mix it in, (I actually use my stir plate while pouring the yeast into the sterile conical flask), and then leave it to stand (covered) to rehydrate usually 15-30 minutes depending on variety, (Lallemand say 15, Fermentis 30).

Fifthly, as you are filling the FV with cooled wort, give the yeast another stir, and pour it into the Fermenter.

Result, Happy yeast ready to get cracking to turn your wort into luscious beer.

should give you some rehydration temperatures to play with.
User avatar
Aleman
Curmudgeonly Brewer
 
Posts: 2870
Joined: Thu Apr 03, 2014 00:28
Location: Mashing In Blackpool, Lancs, UK

Re: How To . . . Rehydrate Yeast

Postby Barney » Sat Apr 05, 2014 19:50

Thanks for that Interesting post and the link. I had not realised the importance of both temperature and rehydration. I had been thinking "oh its only dry yeast just chuck it straight into the fermenter" . I will change my approach a little with that extra insight.
User avatar
Barney
Brewer
 
Posts: 19
Joined: Thu Apr 03, 2014 10:05

Re: How To . . . Rehydrate Yeast

Postby Dusty » Sun Apr 06, 2014 16:20

Very informative,thanks :cheers:
User avatar
Dusty
Brewer
 
Posts: 32
Joined: Sun Apr 06, 2014 14:57

Re: How To . . . Rehydrate Yeast

Postby Mark » Mon Apr 07, 2014 23:09

Thanks Aleman. Could you suggest a brand of bottled water that would be suitable?

@chesterbrewr
User avatar
Mark
Brewer
 
Posts: 523
Joined: Mon Apr 07, 2014 16:40

Re: How To . . . Rehydrate Yeast

Postby BarnsleyBrewer » Tue Apr 08, 2014 00:15

A good how to Aleman


Sent from my iPad using Tapatalk




User avatar
BarnsleyBrewer
Brewer
 
Posts: 1393
Joined: Sat Apr 05, 2014 14:12
Location: Wombwell, South Yorkshire

Re: How To . . . Rehydrate Yeast

Postby Sqrson » Tue Apr 08, 2014 08:17

Ths for the info :cheers:
What temp would you recommend for dreaded Wherry yeast :?: I never rehydrated yeasts before, but will do for that one

“In wine there is wisdom, in beer there is Freedom, in water there is bacteria.”
User avatar
Sqrson
Brewer
 
Posts: 40
Joined: Mon Apr 07, 2014 10:19
Location: Herts

Re: How To . . . Rehydrate Yeast

Postby Aleman » Tue Apr 08, 2014 08:54

User avatar
Aleman
Curmudgeonly Brewer
 
Posts: 2870
Joined: Thu Apr 03, 2014 00:28
Location: Mashing In Blackpool, Lancs, UK

Re: How To . . . Rehydrate Yeast

Postby GaryG » Tue Apr 08, 2014 23:11


Gary

Mac enthusiast, Citroen C5 driver and now homebrew enthusiast.
User avatar
GaryG
Brewer
 
Posts: 152
Joined: Sun Apr 06, 2014 10:08
Location: Glasgow

Re: How To . . . Rehydrate Yeast

Postby oldjiver » Tue Apr 15, 2014 21:17

Having re hydrated with plain water, is there any advantage (after a certain time) in then adding malt/sugar to make a starter for adding later. Or is it just no advantage with dried yeast?
User avatar
oldjiver
Brewer
 
Posts: 169
Joined: Tue Apr 15, 2014 20:53
Location: Essex Suffolk Border

Re: How To . . . Rehydrate Yeast

Postby Good Ed » Tue Apr 15, 2014 21:26


Here's to the man who drinks strong ale,
and goes to bed quite mellow.
Lives as he ought to live,
and dies a jolly good fellow.
- Old English folk song
User avatar
Good Ed
Brewer
 
Posts: 869
Joined: Fri Apr 04, 2014 22:36
Location: Birmingham

Re: How To . . . Rehydrate Yeast

Postby oldjiver » Tue Apr 15, 2014 21:37

:hat: Reason I asked was that much store was made in the past of building up a great foaming starter with no difrentation made between dried and liquid yeasts. Times are changing!
User avatar
oldjiver
Brewer
 
Posts: 169
Joined: Tue Apr 15, 2014 20:53
Location: Essex Suffolk Border

Re: How To . . . Rehydrate Yeast

Postby Bribie G » Wed Apr 16, 2014 01:19

Good advice above.
The Yeast Book by Chris White (the Whitelabs guy) states that around half the yeast cells can be killed by pitching them into wort or sugar solution.

I'm currently on the third generation of Danstary BRY-97 that started off as a dry yeast, but once it's gone through a brew then it can be treated as a liquid yeast from then on.
Re making a starter, it's tempting to try and breed up a big starter for a Lager from one packet of yeast, but as mentioned by Good Ed that's only going to confuse the yeast. Dried yeast is "bred" with good healthy cell walls packed full of all the lipids etc so it's good to go fairly quickly. If you make a starter it's not really going to breed much, just start fermenting as opposed to increasing cell numbers. If pitching into a cold lager it's best to use two packs.

I was talking to a brewer at a craft brewery last week and picking his brains about Lagers (the guy's German) and he said it's far better to pitch cold then bring the temperature up rather than under-pitch warm and drop the temperature in the hope that the yeast will breed up in the meantime. Can produce two quite different beers apparently.
User avatar
Bribie G
Brewer
 
Posts: 112
Joined: Sun Apr 13, 2014 06:50
Location: Kyogle, Border Ranges, New South Wales

Re: How To . . . Rehydrate Yeast

Postby Good Ed » Wed Apr 16, 2014 21:02


Here's to the man who drinks strong ale,
and goes to bed quite mellow.
Lives as he ought to live,
and dies a jolly good fellow.
- Old English folk song
User avatar
Good Ed
Brewer
 
Posts: 869
Joined: Fri Apr 04, 2014 22:36
Location: Birmingham

Re: How To . . . Rehydrate Yeast

Postby CraftyTim » Wed Apr 16, 2014 21:50


I'd rather have a bottle in front of me, than a frontal lobotomy :D
User avatar
CraftyTim
Brewer
 
Posts: 495
Joined: Tue Apr 15, 2014 14:20

Re: How To . . . Rehydrate Yeast

Postby Good Ed » Wed Apr 16, 2014 21:58


Here's to the man who drinks strong ale,
and goes to bed quite mellow.
Lives as he ought to live,
and dies a jolly good fellow.
- Old English folk song
User avatar
Good Ed
Brewer
 
Posts: 869
Joined: Fri Apr 04, 2014 22:36
Location: Birmingham

Re: How To . . . Rehydrate Yeast

Postby BarnsleyBrewer » Wed Apr 16, 2014 22:01

I buy a 500g pack of Nottingham that ferments everything I brew..
As soon as I open the pack I vacuum seal it into individual packs of 40g that ferments me 13 gallons..
I then store it in the freezer ;-)
BB




User avatar
BarnsleyBrewer
Brewer
 
Posts: 1393
Joined: Sat Apr 05, 2014 14:12
Location: Wombwell, South Yorkshire

Re: How To . . . Rehydrate Yeast

Postby CraftyTim » Fri Apr 18, 2014 01:30


I'd rather have a bottle in front of me, than a frontal lobotomy :D
User avatar
CraftyTim
Brewer
 
Posts: 495
Joined: Tue Apr 15, 2014 14:20

Re: How To . . . Rehydrate Yeast

Postby Aleman » Fri Apr 18, 2014 11:59

User avatar
Aleman
Curmudgeonly Brewer
 
Posts: 2870
Joined: Thu Apr 03, 2014 00:28
Location: Mashing In Blackpool, Lancs, UK

Re: How To . . . Rehydrate Yeast

Postby Crankwood » Sat Apr 19, 2014 22:38

Some great advice, cheers Aleman
User avatar
Crankwood
Brewer
 
Posts: 201
Joined: Fri Apr 11, 2014 21:00

Re: How To . . . Rehydrate Yeast

Postby Bribie G » Tue Apr 22, 2014 04:43

I generally freeze any unopened packs of dried yeast anyway. I once lost a sachet in there for about a year. It was only a kit yeast that I'd been keeping for emergencies, and out of interest I rehydrated it and pitched it into a litre of wort. It was crawling out of the vessel the next morning.
User avatar
Bribie G
Brewer
 
Posts: 112
Joined: Sun Apr 13, 2014 06:50
Location: Kyogle, Border Ranges, New South Wales

Re: How To . . . Rehydrate Yeast

Postby rpt » Fri Nov 21, 2014 18:18



User avatar
rpt
Brewer
 
Posts: 1155
Joined: Tue Apr 08, 2014 23:09
Location: Ilkley, West Yorkshire

Re: How To . . . Rehydrate Yeast

Postby Pjam » Tue Jan 06, 2015 15:29

User avatar
Pjam
Brewer
 
Posts: 1701
Joined: Tue Apr 08, 2014 16:51
Location: SE London

Re: How To . . . Rehydrate Yeast

Postby Aleman » Tue Jan 06, 2015 15:31

Ideally yes, but at 110ml in what will be a 25L batch (??) it's not going to cause any issues.
User avatar
Aleman
Curmudgeonly Brewer
 
Posts: 2870
Joined: Thu Apr 03, 2014 00:28
Location: Mashing In Blackpool, Lancs, UK

Re: How To . . . Rehydrate Yeast

Postby Pjam » Tue Jan 06, 2015 17:55

User avatar
Pjam
Brewer
 
Posts: 1701
Joined: Tue Apr 08, 2014 16:51
Location: SE London

Re: How To . . . Rehydrate Yeast

Postby Pjam » Thu Jan 22, 2015 17:13

User avatar
Pjam
Brewer
 
Posts: 1701
Joined: Tue Apr 08, 2014 16:51
Location: SE London

Next

Who is online

Users browsing this forum: No registered users and 2 guests