Well,take for instance the South American chicha,made by chewing the corn & then spitting it into a vessel with water to ferment. It turns out the amylase enzyme in spit that does the job of fermenting. I remember Sam making a batch,tested all the men & women in the office. The women had higher levels of it then men. So it can break down long chain sugars.
But as long as the beer stays sealed,I don't think it's much of a concern in our context.
Everything works if ya let it-Roady(meatloaf)