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Evaluation of preservative systems in a sunscreen formula by linear regression method
Nádia A Bou-Chacra1, Terezinha de Jesus A Pinto, Mitsuko Taba Ohara
1Department of Pharmacy, Faculty of Pharmaceutical Sciences, São Paulo University, São Paolo, Brazil.
Journal of Cosmetic Science
|April 12, 2003
Abstract:
A sunscreen formula with eight different preservative systems was evaluated by linear regression, pharmacopeial, and the CTFA (Cosmetic, Toiletry and Fragrance Association) methods. The preparations were tested against Staphylococcus aureus, Burkholderia cepacia, Shewanella putrefaciens, Escherichia coli, and Bacillus sp. The linear regression method proved to be useful in the selection of the most effective preservative system used in cosmetic formulation.