Hydroxyethyl starch-based polymers for the controlled release of biomacromolecules from hydrogel microspheres
| Autor: | Heike Bunjes, Henning Menzel, Stefanie Wöhl-Bruhn, Steffen Harling, Andreas Bertz |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Starch
Pharmaceutical Science macromolecular substances Methacrylate Polyethylene Glycols Hydroxyethyl Starch Derivatives chemistry.chemical_compound Drug Delivery Systems Polymer chemistry medicine Particle Size chemistry.chemical_classification Drug Carriers Chemistry technology industry and agriculture Dextrans Hydrogels General Medicine Polymer Controlled release Microspheres Chemical engineering Delayed-Action Preparations Immunoglobulin G Self-healing hydrogels Emulsion Methacrylates Emulsions Swelling medicine.symptom Rheology Hydrophobic and Hydrophilic Interactions Linker Fluorescein-5-isothiocyanate Biotechnology |
| Zdroj: | European Journal of Pharmaceutics and Biopharmaceutics. 81:573-581 |
| ISSN: | 0939-6411 |
| DOI: | 10.1016/j.ejpb.2012.04.017 |
| Popis: | Hydrogels are promising delivery systems for the controlled release of biomacromolecules. Based on previous studies, hydrogels were prepared from crosslinkable hydroxyethyl starch with new linker groups to improve mechanical and release properties of the resulting hydrogels. Polyethylene glycol methacrylate with two different spacer lengths was used to obtain polymers (HES-P(EG) n MA) with increased hydrophilicity and degradability, whereas a polymer with methacrylate linker directly at the starch backbone (HES-MA) resulted in a less degradable polymer. Hydrogel disks were obtained by UV crosslinking and characterized by swelling and rheological measurements. The hydrogel strength was strongly influenced by the polymer concentration. Using a water-in-water emulsion process, hydrogel microspheres were prepared. The influence of the type of the linker, the degree of substitution and the phase ratio in the production process on the properties of the microspheres was investigated. Depending on the preparation parameters, particles with narrow particle size distribution and encapsulation efficiencies of up to more than 80% for FITC-dextran 70 kDa (FD70) were obtained. Incorporated FITC-labeled IgG showed a faster release from hydrogel microspheres than FD70. The release rate of incorporated FD70 could be adjusted by using different polymers (HES-P(EG) 10 MA > HES-P(EG) 6 MA > HES-MA). |
| Databáze: | OpenAIRE |
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