Water activity required for growth of Pseudomonas aeruginosa
1. How much water activity is required for growth of Pseudomonas aeruginosa in lotion and cleanser?
2. What percentage of NACL in cleansing product and glycerin in lotion can lower water activity enough that can prevent growth of Pseudomonas aeruginosa?
I am using preservatives against both bacteria and fungi(formalin+ CMI MI+ EDTA in cleansers & phenoxyethanol+ caprylhydroxamic acid+ EDTA currently in emulsions) but as it looks like P. aeruginosa is more sensitive to water activity than any other microbe, i thought if it is possible to prevent its growth with NACL or glycerin to be more confident against it.
I will happily use up to 5% NACL and >10% glycerin in products.
From my studying i got the idea that this is the most dangerous microb from cosmetics & grows in any type of product and packaging faster than any other microb and the water that we use in cosmetics always have it.
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