Ss Brewing Technologies Giveaway!

Home Brew Forums > Home Brewing Beer > Beginners Beer Brewing Forum > Yeast starter
Reply
 
LinkBack Thread Tools
Old 01-10-2013, 10:01 AM   #1
frostyp
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jun 2012
Location: Preston, Lancashire / United Kingdom
Posts: 94
Liked 1 Times on 1 Posts

Default Yeast starter

When making a yeast starter utilising a stir plate.
If doing a stepped starter lets say 250ml, 500ml and 1 litre, do you need to chill and decant wort between each step or can you just add the next size of wort to the original and at the end of the desired volume chill and decant thanks.

__________________
frostyp is offline
 
Reply With Quote Quick reply to this message
Old 01-10-2013, 11:55 AM   #2
Pie_Man
HBT_SUPPORTER.png
Feedback Score: 0 reviews
 
Pie_Man's Avatar
Recipes 
 
Join Date: Aug 2011
Location: Gainesville, FL
Posts: 1,344
Liked 133 Times on 125 Posts
Likes Given: 13

Default

No, you don't need to decant in between the starter steps. I only do so if I need to make a little room in the starter vessel.

__________________
Pie_Man is online now
 
Reply With Quote Quick reply to this message
Old 01-10-2013, 12:55 PM   #3
Odin_Brews
Feedback Score: 0 reviews
Recipes 
 
Join Date: Nov 2011
Location: golden, CO
Posts: 265
Liked 19 Times on 18 Posts
Likes Given: 10

Default

While Im sure you can skip decanting I think optimal for yeast production would be to decant between steps.

I was just reading something about how optimal yeast reproduction occurs at 1.036, post 16 on this thread http://www.homebrewtalk.com/f163/wor...48/index2.html.

So if you don't decant let's say your starter ferments each step to 1.010, then you mix that 250 with 500 ml at 1.040 and you get about 1.030 for your second step. That again ferments out to 750 ml @ 1.010 which you mix with 1 liter getting an SG on your third step of around 1.025.

See what I mean? So you would definetly reproduce cells but not likely in the same way that you would or as optimally as you would by decanting each time.

__________________
Odin_Brews is offline
 
Reply With Quote Quick reply to this message
Old 01-10-2013, 12:55 PM   #4
grem135
Senior Member
HBT_SUPPORTER.png
Feedback Score: 0 reviews
 
grem135's Avatar
Recipes 
 
Join Date: May 2012
Location: St. Louis, Mo.
Posts: 772
Liked 77 Times on 63 Posts
Likes Given: 72

Default

Why do you step your starter if you have the room to do 1 large starter?

__________________

Brew On!

grem135 is offline
 
Reply With Quote Quick reply to this message
Old 01-10-2013, 01:03 PM   #5
Odin_Brews
Feedback Score: 0 reviews
Recipes 
 
Join Date: Nov 2011
Location: golden, CO
Posts: 265
Liked 19 Times on 18 Posts
Likes Given: 10

Default

Good question! Your first step gets the highest growth rate so it would seem if you can 1 step is optimal. But to be honest I have no good answer for you, Im hoping someone else will chime in so I can see what they have to say.

__________________
Odin_Brews is offline
 
Reply With Quote Quick reply to this message
Old 01-10-2013, 02:20 PM   #6
frostyp
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jun 2012
Location: Preston, Lancashire / United Kingdom
Posts: 94
Liked 1 Times on 1 Posts

Default

Thought by doing smaller step ups would not stress the yeast and get a more consistent rate of growth, hopefully doubling up each time

__________________
frostyp is offline
 
Reply With Quote Quick reply to this message
Old 01-10-2013, 03:16 PM   #7
Pie_Man
HBT_SUPPORTER.png
Feedback Score: 0 reviews
 
Pie_Man's Avatar
Recipes 
 
Join Date: Aug 2011
Location: Gainesville, FL
Posts: 1,344
Liked 133 Times on 125 Posts
Likes Given: 13

Default

I'd recommend playing around with the numbers on yeastcalc.com. That site will allow you to see if a single step, or multiple steps, will get you to your target cell count. Your cell count doesn't always double with each step.

__________________
Pie_Man is online now
 
Reply With Quote Quick reply to this message
Old 01-10-2013, 03:28 PM   #8
Pie_Man
HBT_SUPPORTER.png
Feedback Score: 0 reviews
 
Pie_Man's Avatar
Recipes 
 
Join Date: Aug 2011
Location: Gainesville, FL
Posts: 1,344
Liked 133 Times on 125 Posts
Likes Given: 13

Default

Quote:
Originally Posted by Odin_Brews View Post
While Im sure you can skip decanting I think optimal for yeast production would be to decant between steps.

I was just reading something about how optimal yeast reproduction occurs at 1.036, post 16 on this thread http://www.homebrewtalk.com/f163/wor...48/index2.html.

So if you don't decant let's say your starter ferments each step to 1.010, then you mix that 250 with 500 ml at 1.040 and you get about 1.030 for your second step. That again ferments out to 750 ml @ 1.010 which you mix with 1 liter getting an SG on your third step of around 1.025.

See what I mean? So you would definetly reproduce cells but not likely in the same way that you would or as optimally as you would by decanting each time.
Good point. This approach does seem optimal. The only downside I see is the level of planning this would take. If you're going to cool/get the yeast out of suspension, decant, then add fresh starter wort at every step, you'll need to start your starter earlier than usual. Probably about a week, or more, before your brew day. I don't usually need a multi-step starter, but I'm going to try this approach the next time I do.
__________________
Pie_Man is online now
 
Reply With Quote Quick reply to this message
Reply



Quick Reply
Message:
Options
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Starter or No Starter with Large Amount of Washed Yeast jww9618 Fermentation & Yeast 14 02-24-2014 03:56 PM
Does my yeast packet with built in starter, need a starter? dassy Fermentation & Yeast 130 01-24-2012 04:33 PM
Can you add more starter wort to an existing yeast starter? vast_reaction Fermentation & Yeast 10 10-07-2011 03:15 AM
lager yeast starter... no starter Saccharomycetaceae All Grain & Partial Mash Brewing 8 12-02-2010 02:13 PM
Poor yeast starter OR no yeast starter? amh0001 Beginners Beer Brewing Forum 1 11-26-2009 11:40 AM