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Increase in subjective well‐being and psychological health after application of C8‐silk lipoamino acid functionalized pigments included in a foundation

Abstract : Objective The aim of this study was to evaluate the effects of two foundations before (D0) and after 5 days of application (D6) on psychophysiological parameters in order to compare C8-silk lipoamino acid functionalized pigments (FA) versus pure pigments (FP). Methods Assessment of self-esteem, stress, mood and emotion using psychological tests and evaluation of salivary cortisol concentrations were realized on 40 healthy females using a crossover study design at D0 and D6. Four saliva samples were taken on the awakening (C1), 30 min after the awakening (during the foundation application (C2)), 1 h after the foundation application (C3) and at 1900 h (C4) at DO and D6. Area under the curve was calculated in order to obtain information about the total amount of a given substance excreted in a specific time period. Results Five days of daily application of the foundation containing the pigments treated with the C8-silk lipoamino acids induced a significant increase (P < 0.001) in self-esteem and pleasant emotion (P < 0.05), and a significant decrease in general stress (P < 0.05). This was not the case after the FP application. Cortisol concentrations presented a pronounced diurnal rhythm whatever the foundation used. At DO, no significant differences were observed between the groups. At D6, cortisol concentrations measured 30 min and 1 h after the FA application were significantly lower (P < 0.05: C6.2, P < 0.05 C6.3, respectively) than those reported after FP application. AUC, a global stress response indicator, was significantly lower in FA group as compared to FP group after 5 days of application. Subjects found a decrease in tiredness signs and thought that FA has a good coverage. Conclusion Our results show that incorporation of C8-silk lipoamino acid as agent of pigment functionalization brings new benefits to a foundation. Adopting a psychophysiological approach, which is not invasive to the subjects, we show the measurement of cortisol at the same time that psychological indicators provide a scientific approach to examine the beneficial effects of a cosmetic product.
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https://hal.inrae.fr/hal-03037385
Contributor : Sabine Rossi <>
Submitted on : Thursday, December 3, 2020 - 9:43:11 AM
Last modification on : Tuesday, June 15, 2021 - 3:31:19 AM

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M. Cabannes, C. Risselada, L. Chaisemartin, J. Pasquet, E. Couval, et al.. Increase in subjective well‐being and psychological health after application of C8‐silk lipoamino acid functionalized pigments included in a foundation. International Journal of Cosmetic Science, Wiley, 2019, 41 (5), pp.489-495. ⟨10.1111/ics.12566⟩. ⟨hal-03037385⟩

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