Does Beta Amylase Break Down Lactose? - Home Brew Forums
Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > Does Beta Amylase Break Down Lactose?

Reply
 
Thread Tools
Old 10-13-2009, 04:56 PM   #1
Jewrican
Recipes 
 
Aug 2008
GA
Posts: 882
Liked 6 Times on 5 Posts



I have a stout that was too sweet and so i threw beta amylase in there. Since it was too sweet, i did not add the lactose, but really would love to have it for the mouthfeel. The stout is finally not nearly as sweet as it used to be and I was wondering if I added the lactose, would the beat amylase break it down?

Would it remove the sweetness? how about the mouthfeel?

Thanks for any help.


__________________
JewRican Brew Works

 
Reply With Quote
Old 10-13-2009, 05:26 PM   #2
remilard
Recipes 
 
Nov 2008
Kansas City
Posts: 3,654
Liked 43 Times on 41 Posts


No, lactose lacks the type of bond that beta amylase is active on.



 
Reply With Quote
Old 10-13-2009, 05:35 PM   #3
Jewrican
Recipes 
 
Aug 2008
GA
Posts: 882
Liked 6 Times on 5 Posts


cool!

i will take a gravity reading of the way it is currently to get an idea and then add some. Because it finished high, i most likely wont add all the recipe stated to add, but i will certainly add some.

Thanks!
__________________
JewRican Brew Works

 
Reply With Quote
Old 10-13-2009, 05:37 PM   #4
david_42
 
david_42's Avatar
Recipes 
 
Oct 2005
Willamina & Oak Grove, Oregon, USA
Posts: 25,593
Liked 151 Times on 142 Posts


Lactase cleaves the lactose molecule into its two subunits, the simple sugars glucose and galactose.

You might consider adding maltodextrin to improve the mouthfeel. It's about half as sweet as lactose.
__________________
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"

"I would like to die on Mars, just not on impact." Elon Musk

 
Reply With Quote
Old 10-13-2009, 06:01 PM   #5
hexmonkey
HBT_SUPPORTER.png
 
hexmonkey's Avatar
Recipes 
 
Dec 2007
Hunterdon County, NJ
Posts: 366
Liked 12 Times on 10 Posts


Talking apples and oranges here. Lactose is a sugar, which is to say it's the output of that reaction, not the input.

http://en.wikipedia.org/wiki/Amylase

Quote:
An amylase is an enzyme that breaks starch down into sugar.
http://en.wikipedia.org/wiki/Lactose

Quote:
Lactose (also referred to as milk sugar) is a sugar that is found most notably in milk.

 
Reply With Quote
Old 10-13-2009, 07:51 PM   #6
remilard
Recipes 
 
Nov 2008
Kansas City
Posts: 3,654
Liked 43 Times on 41 Posts


Lactose is not the product of beta amylase mediated hydrolysis, maltose is.

 
Reply With Quote
Old 10-13-2009, 08:44 PM   #7
hexmonkey
HBT_SUPPORTER.png
 
hexmonkey's Avatar
Recipes 
 
Dec 2007
Hunterdon County, NJ
Posts: 366
Liked 12 Times on 10 Posts


Quote:
Originally Posted by remilard View Post
Lactose is not the product of beta amylase mediated hydrolysis, maltose is.
Sorry for that, I didn't actually read what I wrote.

What I meant to write was, sugar (however not specifically lactose) is the output of an amylase reaction, not the input...

 
Reply With Quote
Old 10-13-2009, 08:48 PM   #8
Clayton
Recipes 
 
Apr 2008
NE Oklahoma
Posts: 1,484
Liked 20 Times on 18 Posts




wheres that research cat when you need him
__________________
Once, during Prohibition, I was forced to live for days on nothing but food and water. ~ W.C. Fields

 
Reply With Quote
Old 10-14-2009, 09:17 PM   #9
hexmonkey
HBT_SUPPORTER.png
 
hexmonkey's Avatar
Recipes 
 
Dec 2007
Hunterdon County, NJ
Posts: 366
Liked 12 Times on 10 Posts


Heh, research cat might wanna actually read what I wrote. It was my summary that was inaccurate, not the research.



 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
BCS-460 Beta Test slnies Equipment/Sanitation 160 11-05-2011 05:09 PM
Milk Stout/Lactose and lactose intolerance SpanishCastleAle All Grain & Partial Mash Brewing 20 05-03-2011 07:11 AM
BTP 1.5 Beta is out now. Bobby_M Brewing Software 59 09-03-2008 04:54 PM
Optimum Mash for Beta Amylase with Minimum Sparging? EinGutesBier General Techniques 2 04-26-2008 12:27 AM
What is 'Beta' in hops? Kayos General Beer Discussion 2 10-01-2007 09:05 PM


Forum Jump