Carbohydrate Utilization by Lactic Acid Bacteria - Home Brew Forums
Register Now For Free!

Home Brew Forums > Home Brewing Beer > Brew Science > Carbohydrate Utilization by Lactic Acid Bacteria

Thread Tools
Old 08-17-2013, 08:55 PM   #1
Aug 2013
Posts: 1

Hi all. Question for you.

To the best of my understanding, in a lambic or sour fermentation, saccharomyces is still responsible for the bulk of sugar > EtOH conversion, but there are other more complex carb molecules that sacch. is not a specialist in that are usually then left to Bret, Pedio and Lactobacillus for more fermentation.

Does anybody know precisely what these other three bugs are chewing on?

Any insights would be helpful.

Reply With Quote
Old 08-19-2013, 04:11 AM   #2
Mar 2013
Posts: 221
Liked 18 Times on 18 Posts

They all ferment sugars like glucose, fructose and sucrose. All pedio and some lacto strains only produce acid from those sources. they're called homofermentative - think yogurt. Some lacto strains can also metabolize starches and other glucans, and will produce alcohol as well as acid. those are called heterofermentative.

Wild yeasts will metabolize a variety of longer chain dextrins, and even some odd sugars like xylose and raffinose.

biertourist Likes This 
Reply With Quote
Old 08-20-2013, 10:29 PM   #3
Oct 2012
Woodinville, WA
Posts: 862
Liked 126 Times on 95 Posts

Well I hoped to respond to this one but I don't really need to as PDX_T has completely covered it.

The homofermentative strains simply take one sugar in and produce one acid out.


Reply With Quote
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
Phosphoric Acid vs Lactic Acid Yooper Brew Science 36 03-05-2014 01:18 AM
Lactobacillus Bacteria vs. Lactic Acid in Berliner Weisse drewski Recipes/Ingredients 4 05-12-2013 03:01 PM
Lactic Acid bmick Recipes/Ingredients 3 02-26-2013 02:33 AM
lactose to feed lactic bacteria TimT Lambic & Wild Brewing 5 10-10-2012 12:42 PM
Storing Lactic Acid Bacteria BarlimanButterbur Fermentation & Yeast 0 02-02-2012 04:43 AM

Forum Jump