[Thermal stability evaluation of some W/O/W double emulsions containing 1% piroxicam by rheological measurements]. / Evaluarea stabilitatii termice a unor emulsii duble H/L/H cu piroxicam prin determinari reologice.

UNLABELLED: The aim of this work was to evaluate thermal stability of some W/O/W concentrated double emulsions (with 80% dispersed phase) containing 1% piroxicam following their theological behaviour at various temperatures. W/O/W double emulsions containing 1% piroxicam were prepared using the two-step procedure. RESULTS: The variable parameter of formulations was the hydrophilic macromolecule compound dispersed in the internal and external aqueous phases (hydroxyethylcellulose and Carbopol 940). Rheological behaviour and viscosity of the obtained W/O/W double emulsions was measured at 15 degrees C, 20 degrees C, 25 degrees C, 30 degrees C and 35 degrees C respectively, after preparation. The obtained results demonstrated that the studied W1/O/W2 double emulsions containing 1% piroxicam were stable under applied thermal stress, although they exhibited some differences in rheological properties caused by formulation variable.