Measurement of Adhesive Properties of Polymers in vitro


Authors: E. Šnejdrová;  M. Dittrich
Authors‘ workplace: Univerzita Karlova v Praze, Farmaceutická fakulta v Hradci Králové, Katedra farmaceutické technologie
Published in: Čes. slov. Farm., 2006; 55, 262-266
Category: Original Articles

Overview

Adhesive force of branched oligoesters under the in vitro conditions was studied by measuring the maximal force necessary to separate the tested sample from the base (Fmax) under different testing conditions. Branched oligoesters were synthesized from lactic and glycolic acids in the molar ratio 1:1, and from mannitol or dipentaery thritol as the branching components in concentrations of 3%, 5% or 8%. To decrease viscosity and thus to facilitate the workability and administration, triethyl citrate (TEC) in a concentration of 30% was employed. Polymeric systems for adhesive force measurements were prepared by melting oligoesters in a micro oven and by homogenization with TEC. Adhesive force was measured on a material testing device T1-FR050TH.A1K Zwick/Roell at the set rate of separation 10 mm/min or 100 mm/min, contact force 10 N or 20 N, and a period of contact of the sample with the base of 5 s or 10 s. The adhesive force of branched oligoesters was found to be significantly higher than the adhesive force of gelatine gels, methylcellulose, carmelose sodium salt or sodium carbomer salt. Dipentaerythritol-branched oligoesters exerted higher adhesive force than mannitol-branched oligoesters. The value of adhesive force was increased with growing concentration of the branching component in the oligoester. Of the experimental parameters tested, a statistically significant influence of the separation rate of the sample from the base on the magnitude of Fmax was observed. The influence of different periods of contacts was manifested only in some samples, and the influence of different contact forces on Fmax value was not demonstrated in any sample.

Key words:
bioadhesion – in vitro tests – branched oligoesters


Labels
Pharmacy Clinical pharmacology
Login
Forgotten password

Don‘t have an account?  Create new account

Forgotten password

Enter the email address that you registered with. We will send you instructions on how to set a new password.

Login

Don‘t have an account?  Create new account