Evaluation of antioxidant properties of dermocosmetic creams by direct electrochemical measurements
Cyclic voltammetry and linear sweep voltammetry were preliminarily used in order to evaluate the global antioxidant properties of dermocosmetic creams. Experiments were performed by introducing electrodes directly into the creams without any pre-treatment of the samples. Current potential
curves showed significant anodic current depending on the antioxidant-containing cream studied. In comparison, little amperometric response was recorded with an antioxidant-free cream base. Aqueous solutions of the corresponding antioxidants showed analogous anodic waves and similar peak potentials.
A correlation between the global anodic peak and the presence of the antioxidant species in the cream was made with eleven skin creams, attesting to the reliability of the method. Among the tested electrode materials, platinum gave the best results in terms of electrochemical kinetics and
measurement precision (current peak standard deviation <5%). Exposure of a depilatory cream to oxidizing agents (e.g. hydrogen peroxide, air, or light) caused a decrease in peak current as expected. This methodology enabled us to evaluate the evolution of the total antioxidant capacity
under oxidative stress and gives encouragement to further development of a voltammetric method to quantify cream antioxidant power.
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Document Type: Research Article
Laboratoire de Genie Chimique, UMR 5503, Université Paul Sabatier, 118 Route de Narbonne, 31062 Toulouse, Franc
Centre de Recherche Dermo-cosme´tique Pierre Fabre, Alle´e Camille Soula, BP 74-Vigoulet, 31322 Castanet, Tolosan, France
August 1, 2005