The challenge test predicts the antimicrobial abilities of cosmetic preservatives over a prolonger period of time. Salgado and colleagues critique the efficacy of the challenge test for analysisng preservative effectiveness in this critical review.
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The use of the challenge test to analyse preservative efficiency in non-sterile cosmetic and health products: applications and critical points
F. A. M. Fiorentino, M. Chorilli and H. R. N. Salgado
Anal. Methods, 2011
DOI: 10.1039/C0AY00597E