Don’t Leave the Leaven?

Q. My question on Fleishmann’s (aka baking) yeast – I use this to ferment apple and grape juice. Can I assume that I don’t have to sell the wine due to chametz (I’m not planning on using it for Pesach)?
If I do need to sell it and let’s say the grape juice is not mevushal – would it create Stam Yanum – if no goy actually touches it?

A. Rabbi Tsvi Heber (Director of Community Kosher – COR) answered to our query: “Baker’s yeast is not chometz and could be owned on Pesach. But it cannot be consumed on Pesach.” So the yeast itself and other non-chometz foods that were fermented by it do not have to be sold. However, even if they were to be sold, it would not prohibit the wine thus fermented. Only what was actually touched or moved by a Gentile may be prohibited. (Shulchan Aruch Y.D. 123: 1)