Control of vitamin B12 release from poly(ethylene glycol)/poly(butylene terephthalate) multiblock copolymers

Dijkhuizen-Radersma van, R. and Peters, F.L.A.M.A. and Stienstra, N.A. and Grijpma, D.W. and Feijen, J. and Groot de, K. and Bezemer, J.M. (2002) Control of vitamin B12 release from poly(ethylene glycol)/poly(butylene terephthalate) multiblock copolymers. Biomaterials, 23 (6). pp. 1527-1536. ISSN 0142-9612

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Abstract:	The release of vitamin B12 (1355 Da) from matrices based on multiblock copolymers was studied. The copolymers were composed of hydrophilic poly(ethylene glycol)-terephthalate (PEGT) blocks and hydrophobic poly(butylene terephthalate) (PBT) blocks. Vitamin B12 loaded films were prepared by using a water-in-oil emulsion method. The copolymer properties, like permeability, could be varied by increasing the PEG-segment length from 300 up to 4000 g/mol and by changing the wt% of PEGT. From permeation and release experiments, the diffusion coefficient of vitamin B12 through PEGT/PBT films of different compositions was determined. The diffusion coefficient of vitamin B12 was strongly dependent on the composition of the copolymers. Although an increased wt% of PEGT (at a constant PEG-segment length) resulted in a higher diffusion coefficient, a major effect was observed at increasing PEG-segment length. By varying the copolymer composition, a complete release of vitamin B12 in 1 day up to a constant release for over 12 weeks was obtained. The release rate could be effectively tailored by blending copolymers with different PEG-segment lengths. The swelling and the crystallinity of the matrix could explain the effect of the matrix composition on the release behavior.
Item Type:	Article
Copyright:	© 2002 Elsevier
Faculty:	Science and Technology (TNW)
Research Group:	Biomaterials Science and Technology (BST) Polymer Chemistry and BioMaterials (PBM)
Link to this item:	http://purl.utwente.nl/publications/74795
Official URL:	http://dx.doi.org/10.1016/S0142-9612(01)00286-1
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