Rheological Behavior of Some Collagen Creams

Skin creams are used especially in restoring physical properties of the skin, particularly the state of hydration. Rheology is one of the methods used to characterize creams, both for determination of cream structure and quality control of the product. The aim of this work was to rheologically characterize three collagen creams: the basic one, named the reference, and two in which various extracts of fish (bream eggs and viscera) have been loaded. The most homogeneous and viscous cream was the reference cream and those with fish extracts in their composition result in viscosity decrease. All creams showed pseudoplastic rheological behavior dependent on time, namely thixotropic behaviour, less accentuated for reference cream.