Release of antithrombotic drugs from alginate gel beads.

Abstract:

:The aim of the present work was to evaluate alginate hydrogels in the form of spherical beads as carrier for antithrombotic drugs for future use in artificial grafts. The ionotropic gelation technique was employed to prepare beads from the L. hyperborea stipe of alginate with two different alginate concentrations and two different guluronic to manuronic acid ratios. The beads were loaded, via soaking, with three different types of low molecular weight model molecules representing drugs with antithrombotic action and their release characteristics were subsequently evaluated. The entire release process of the negatively charged model drugs under study (Salicylic acid and Hirudin), was found to be governed by diffusion, while additional electrostatic interactions between drug molecule and alginate matrix was indicated to influence the release rate of the analyzed positively charged drug molecule (Dipyridamole). It was found that the alginate hydrogel matrix imposed a decrease of the drug diffusion rate on the molecules under study as compared to the corresponding diffusion rates in water. All diffusion coefficients decreased slightly with increasing concentration of alginate and with increasing guluronic to manuronic acid ratio. The results show on the potential use of alginate gel beads when developing vehicles for release of low molecular weight antithrombotic drugs.

journal_name

Curr Drug Deliv

journal_title

Current drug delivery

authors

Jämstorp E,Bodin A,Gatenholm P,Jeppsson A,Strømme M

doi

10.2174/156720110793360630

subject

Has Abstract

pub_date

2010-10-01 00:00:00

pages

297-302

issue

4

eissn

1567-2018

issn

1875-5704

pii

BSP/CDD/E-Pub/00025

journal_volume

7

pub_type

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