Power Law Equation and Liberation Kinetics

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Mocninná rovnice a kinetika liberace

Při modelování kinetiky difuze a relaxace v polymerní matrici se nejčastěji využívá mocninná rovnice ve dvouparametrovém nebo tříparametrovém tvaru. V úvodní části jsou shrnuty používané varianty mocninné rovnice včetně rovnice umožňující rozlišení mezi difuzí a relaxací. Kinetika liberace pilokarpiniumchloridu z lyofilizovaných lamel s odstupňovaným množstvím hydroxypropylmethylcelulosy je vyjádřena mocninnými rovnicemi a jsou srovnány jejich parametry. V závěru je diskutována použitelnost mocninné rovnice při modelování liberace léčivých látek a doporučeno využití tříparametrové mocninné rovnice s posunem uvolňování mimo počátek souřadnic.

Klíčová slova:
mocninná rovnice – kinetika liberace – pilokarpiniumchlorid – hydroxypropylmethylcelulosa

Authors: Z. Zatloukal
Authors‘ workplace: Katedra farmaceutické technologie Farmaceutické fakulty Univerzity Karlovy, Hradec Králové
Published in: Čes. slov. Farm., 2005; 54, 39-42
Category: Original Articles

Overview

For the modelling of the kinetics of diffusion and relaxation in the polymer matrix, the power law equation in a two-parameter or three-parameter form is employed. The introductory part of the paper summarizes the employed varieties of the power law equation including the equation making it possible to distinguish diffusion from relaxation. The liberation kinetics of pilocarpinium chloride from lyophilized lamellae with graded amounts of hydroxypropylmethylcellulose is expressed by power law equations and their parameters are compared. The conclusion discusses the usability of the power law equation in the modelling of liberation of active ingredients and recommends the use of the three-parameter power law equation with a shift of the liberation out of the origin of the coordinates.

Key words:
power law equation – liberation kinetics – pilocarpinium chloride - hydroxypropylmethylcellulose

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Article was published in

Czech and Slovak Pharmacy

2005 Issue 1