I would like to know a good reason for adding commercial yeast (Saccharomyces cerevisiae) to a sourdough culture and would it survive?
Dough – Commercial yeast ( Saccharotheces cerevisiae) in a sourdough culture
cultured-foodsourdough-starteryeast
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Best Answer
I think the question could refer to two somewhat different practices: (1) adding some commercial yeast to a particular sourdough recipe during the initial mix, or (2) adding commercial yeast to the sourdough culture itself, intending it to propagate from batch to batch.
The first -- mixing in commercial yeast along with sourdough starter in a recipe -- is commonly used by bakers for a few different reasons:
The second possibility -- adding commercial yeast to the sourdough culture directly -- is pretty rare and ultimately not very helpful in the long run. Some sourdough recipes suggest adding commercial yeast to "get a starter going" initially, but this is NOT a good practice, since it tends to delay the establishment of the natural yeast you actually want and need to propagate the starter longterm. When added to an established starter, commercial yeast will generally die off within a few feeding cycles. The acidic environment is not conducive to yeast growth in general, and commercial yeast will have a much harder time with it than the natural yeasts of established starters -- so the commercial yeast will decrease population significantly with each feeding.
All of that said, actual studies of sourdough cultures from commercial bakeries often show some baker's yeast as a minor component. This is likely due to contamination from bakers' hands and equipment where commercial yeast-based doughs are also handled and mixed. In controlled lab environments, the commercial yeast populations in those starters have been shown to die off pretty quickly after the starters were removed from their "native" bakery environment.