Method for preparing an extract of at least one bacterium of the species Staphylococcus epidermidis, and cosmetic applications of said extract to prevent and / or treat the signs of aging of keratinous materials

Abstract

Method for preparing an extract of at least one bacterium of the species Staphylococcus epidermidis, and cosmetic applications of said extract to prevent and / or treat the signs of aging of keratinous materials. The present invention relates to a method for preparing an extract of at least one bacterium of the species Staphylococcus epidermidis comprising at least one step of culturing at least one bacterium of the species Staphylococcus epidermidis in the presence of a culture medium comprising i) at least one sugar, ii) at least one peptone of vegetable origin and / or at least one yeast extract, and optionally iii) at least one microelement.The present invention also relates to an extract of at least one bacterium of the species Staphylococcus epidermidis, preferably an extract of at least one bacterial strain of the species Staphylococcus epidermidis chosen from the group consisting of bacteria deposited at the CNCM under order numbers I-5688, I-5689, I-5904, I-5691, I-5692, I-5693, I-5694 and I-5695, capable of being obtained, or obtained, or directly obtained according to the aforementioned preparation process. The present invention further relates to a biomass extract of at least one bacterial strain of the species Staphylococcus epidermidis chosen from the group consisting of bacteria deposited at the CNCM under order numbers I-5688, I-5689, I-5904, I-5691, I-5692, I-5693, I-5694 and I-5695.The present invention also relates to cosmetic treatment processes and cosmetic uses of said extracts for the care of keratinous materials, for the prevention and / or treatment of signs of aging of keratinous materials, and as an anti-aging active ingredient.