Abstract:

The aim of the work. Investigation of rheological (thixotropic) properties of the developed gel and determination of temperature influence on its stability. Materials and Methods. The subject of the study was a gel for local treatment of burns based on a cross-linked copolymer of acrylic acid – a carbomer Carbopol® Ultrez 21 containing a water extract with xenoderm and lidocaine hydrochloride. The rheological properties studied on a rotary viscometer "Rheomat-30". The shear stress, dynamic viscosity and mechanical stability were studied as a characteristic of gel. Results and Discussion. In order to determine the flow type, the presence of thixotropic properties and the mechanical stability of the gel, the rheogram of its fluidity was investigated. During the experiments, it was found that the gel under investigation is a non-Newtonian fluid and had a plastic type of fluidity that characterizes it as a structured disperse system. The presence of thixotropic properties in the investigated gel characterizes the satisfactory ability to extrude from tubes and smearing. Conclusions. Dependence of rheological properties, in particular, structural viscosity of the investigated gel on temperature is determined. Calculated values of the mechanical stability of the gel allow predicting the stability of the drug during its intended shelf life.

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