« on: November 14, 2010, 08:38:45 PM »
What is StarSan's mechanism of action, then?
StarSan has 50% Phosporic Acid, 15% Dodecylbenzenesulfonic Acid (a detergent), and 15% "inert ingredients."
I'm just curious how yeast washing with phosphoric acid at low temps can kill bacteria, but not yeast (or wild yeast); but StarSan with 50% Phosphoric Acid when used at ambient temperatures is an effective sanitizer (and presumably kills bacteria and all yeast strains).
Star San is an acid anionic sanitizer. Here is a brief description of how they work:
The salient point being that the surfactant is what is doing the sanitizing directly, the phosphoric acid is there to provide the proper pH environment.