Does that happen? That would ease my worries about using my brass fittings (lead and such).
Yeast have a protein of a class called metalothioneins
, theirs is from the gene called CUP1
. Its highest affinity is for copper, but it'll bind other metals to some degree or another. It causes the metal to be sequestered away in the yeast. It's not perfect, but it'll get most of the heavier metals out of the wort.