Objective: To see if xylitol can be used as a non-fermentable sweetner or if xylitol kills (brewers)yeast.
i had 3 bottles in which i put:
Bottle 1: water + yeast + sugar
Bottle 2: water + yeast + sugar + xylitol
Bottle 3: water + yeast + xylitol
i then put balloons on each of the bottles' mouths.
Bottle 1: the balloon swelled slightly, foam from fermentation is visible
Bottle 2: the balloon swelled significantly and in fact blew right off the bottle, leaving yeast foam all over the walls (which i had to clean later :-(( )
Bottle 3: no activity. the balloon had in fact been sucked into the bottle. i suspect because the water solution had cooled down and thus the air pressure inside the bottle went down?
Xyiltol is non-fermentable. Xylitol does not kill (brewers)yeast, at least not in the ratio used in this experiment (about 1:1).
i think the reason for Bottle 2 showing stronger fermentation than bottle 1 is because i might have put more sugar into bottle 2.
after a while, i also added xylitol to bottle 1, and sugar to bottle 3.
bottle one kept on fermenting, and bottle 3 started fermenting shortly after the addition of the sugar.