Can store-bought (i.e. pasteurized) cream be cultured at home for making cultured butter?
I've read several recipes for DIY butter which recommend letting your cream sit out at room temperature for a few hours or overnight.
The idea is to allow naturally occurring microbes in the cream to promote fermentation, in order to add complexity to the flavor of the cream and the resulting butter.
My question is: is this even possible with store-bought cream which has been pasteurized or "ultra pasteurized"? Do the microbes necessary for cultured cream survive this process?
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The end result of inoculating cream with yogurt may technically be called cultured butter but it won't produce the desired results. The bacteria in yogurt are completely different than those in cultured butter and will produce a much higher acid content and the compound acetaldehyde which gives yogurt its distinctive taste. Butter cultures produce a much lower level of acidity and the chemical diacetyl, the compound that literally defines butter's flavor.
http://food52.com/blog/3075_cultured_butter_at_home
Pasteurization kills the bacteria that would cause the changes you've read about along with pathogenic bacteria such as Salmonella, E. coli, and Listeria. Commercial producers of cultured butter introduce specific strains of bacteria to pasteurized cream to safely and consistently obtain the desired results.