"Lactobacillus is an interesting organism. It is known for its rapid fermentation in dairy products, producing all the required acidity for yogurt in just a few hours at high temperature (115-120 F). The problem with using Lacto is the huge range the genus comprises. For example, the*strain sold by Wyeast
*(5335)*is only capable of fermenting about 10-12% of the carbohydrates in a standard wort, not nearly enough attenuation for something resembling beer. LuckilyWhite Labs’ 677 strain
*is capable of producing an enzyme which allows it to ferment maltose, maltotriose, and raffinose, ensuring a dry finished beer without aid. In addition to lactic acid, WLP677 also produces both alcohol and carbon-dioxide, so the result should be similar to a beer fermented with yeast. Even if my attempt to use this particular strain doesn’t work, it may just mean that I have to find a strain that is better suited for the task"
So that states that only 10-12% of the sugars is fermentable by the Wyeast Lacto, not that all will be fermented and only 10-12% of which would become alcohol. So I'm not sure if that was a misunderstanding or if you are refering to something else.
From another thread on this subject:
actic acid bacteria can be divided into two groups based upon the products produced from the fermentation of glucose. Homofermentative organisms ferment glucose to two moles of lactic acid, generating a net of 2 ATP per mole of glucose metabolized. Lactic acid is the major product of this fermentation. Heterofermentative lactic acid bacteria ferment 1 mole of glucose to 1 mole of lactic acid, 1 mole of ethanol, and 1 mole of CO2. One mole of ATP is generated per mole of glucose, resulting in less growth per mole of glucose metabolized. Because of the low energy yields, lactic acid bacteria often grow more slowly than microbes capable of respiration, and produce smaller colonies of 2-3 mm."
So I obviously have Heterofermentative Lacto with the CO2 that was produced. But who knows how much alcohol. I've already pitched the Brett and will let it ride. We'll see how it turns out...