Sodium Benzoate Preservative
CAS No.532-32-1 Sodium Benzoate is a food grade preservative generally regarded as safe GRAS worldwide. water soluble. While it shows some activity up to pH 6 about 1.55, it is most active at pH 3 94.
As benzoic acid, it is considered to be primarily an antifungal, but it shows some activity against bacteria. It is poor against pseudomonads. Benzoic acid is inactivated by nonionics and by raising the pH. Sodium Benzoate is not a broad spectrum preservative for cosmetic use and should be combined with other preservatives. If Sodium Benzoate is used as a preservative, the pH of the finished product may need to be lowered enough to release the free acid for useful activity. Sodium Benzoate is often combined with Potassium Sorbate in low pH products to provide a synergistic preservative effect against yeast and mold.