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potassium sorbate at a slightly higher pH (~5.2)
I’m eager to hear your thoughts and get any advice on using potassium sorbate as the only anti-mold/fungi/yeast preservative in water type formula at pH ~5.2, or, at the lowest, pH 5.
I have anti-bacterial preservatives in the formula but they are not known to be much anti-MFY; for ex, 1,2 hexandiol.
I read things that say that at pH 5, potassium sorbate is only effective to ~37% (https://lotioncrafter.com/products/potassium-sorbate).
My starting concentration to test is 0.2% of potassium sorbate.
Would love to hear your thoughts on whether this sounds likely to succeed or problematic.
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5 Replies
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Try to get at least 0.1% preservative in acid form by reducing pH, increasing quantity or adding another antifungal preservative too.
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I’d guess it would be unlikely to succeed. There is not enough salt in the acid form at pH 5. Why not go lower than that?
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Okay, thank you both.
I guess, following Abdullah’s advice, using pH 5 (which seems to lead to 37% activity, at least purportedly), and also increasing the concentration to 0.3% potassium sorbate would likely work, as it should lead to 0.111% in the active form. To @Perry44 I want to go low pH as you said for preservative reason but it seems one of my active ingredients is unstable at a low pH.
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Which active ingredient?
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Be esp. attentive to stability with sorbate
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