Pore sizes in hydrated dextran microspheres.

Abstract:

:The average pore size of hydrated dextran microspheres is derived from rheological and protein release data. The microspheres were prepared by cross-linking an aqueous solution of methacrylated dextran emulsified in a continuous poly(ethylene glycol) phase. The rheological data were obtained using a novel micromanipulation technique, which enables the compression of a single microsphere. The so obtained pseudoelasticity moduli of the microspheres were derived from these compression data and corresponded well with the elasticity moduli of macroscopic hydrogels of the same composition, as determined with dynamic mechanical analysis. The modulus increased with decreasing water contents of the microspheres and with increasing degrees of methacrylate substitution of the dextran used. Furthermore, the average pore sizes calculated from the pseudoelasticity moduli were in good agreement with the pore sizes derived from protein release data. In conclusion, this study shows that micromanipulation provides insight into the average pore sizes of dextran microspheres, which is an important characteristic that will modulate the release of encapsulated proteins.

journal_name

Biomacromolecules

journal_title

Biomacromolecules

authors

Stenekes RJ,De Smedt SC,Demeester J,Sun G,Zhang Z,Hennink WE

doi

10.1021/bm005574a

keywords:

subject

Has Abstract

pub_date

2000-01-01 00:00:00

pages

696-703

issue

4

eissn

1525-7797

issn

1526-4602

journal_volume

1

pub_type

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