Abstract: The present invention relates to the field of cosmetic and dermopharmaceutical compositions. It concerns oligomer compounds of D-glucuronic acid or D-glucuronate with a ? (1-4) sequence (or oligoglucuronans) containing a degree of acetylation specifically between 8.7±0.5 and 9.2±0.5% by weight of O—CO—CH3 group compared to the weight of glucuronic acid and with a degree of polymerisation (DP) of 18?19±2. The oligomer compounds according to the present invention are intended to stimulate the elasticity of the dermis and epidermis although they also act to increase derma-epidermal cohesion in order to combat skin ageing, lines, wrinkles, visible and/or tactile skin discontinuities, loss of firmness, elasticity and tone and to combat skin tissue deformability. The invention also concerns a cosmetic composition containing at least one compound as recited according to the present invention.

Abstract: The invention relates to a device for measuring the mechanical properties of the skin which is free from all parameters interfering with measurement. The device comprises: a) a pneumatic assembly (16) for delivering compressed air to apply a stress to the surface of the skin undergoing measurement, b) an electronic assembly (6) for contact-free measurements on said surface of the skin subjected to the stress, and c) a control software (19) for controlling the electronic assembly (6) and for processing measurement data in order to deduce the mechanical properties of the skin.

Abstract: The subject matter of the present invention is a cosmetic or dermopharmaceutic composition comprising a combination of homarine and erythritol as well as a non-therapeutic treatment method of the skin to improve cutaneous hydration, to prevent and/or treat cutaneous dryness signs, to restore and/or protect the cutaneous barrier function, to protect cells of the skin and/or of the scalp from osmotic shocks, for example from UV induced osmotic shocks.