Abstract
Poly(α-hydroxy octanoic acid) was first used as an additive for the preparation of electrospun ultra-fine fibers of poly(ethylene glycol)-b-poly(L-lactide) (PEG-PLLA). Ibuprofen was loaded in the electrospun ultra-fine fibers. The results from environmental scanning electron microscopy (ESEM), wide angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC) demonstrated that ibuprofen could be perfectly entrapped in the fibers electrospun from PEG-PLLA using α-hydroxy octanoic acid or PEG-b-poly(α-hydroxy octanoic acid) (PEG-PHOA) as additives. Compared with electrospun PEG-PLLA fibers which entrapped 20 wt% ibuprofen, the PEG-PLLA electrospun fibers containing PEG-PHOA exhibited integral and robust after 1 week incubated in 37°C, pH 7.4 phosphate buffer solution with 10 μg/mL proteinase K. Compared with electrospun fibers without PEG-PHOA, the concentration of proteinase K in release media had less effect on the release rate of ibuprofen. An unique release profile was found from PEG-PLLA fiber after the incorporation of PEG-PHOA. Enzyme degradation experiments demonstrated that PEG-PHOA but not α-hydroxy octanoic acid monomer was the crucial factor for integrity maintenance of the electrospun fibers, which may be due to the enzyme degradation tolerance property of the PEG-PHOA polymer additive.
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This work was financially supported by the National Natural Science Foundation of China (Nos. 20274048, 50373043), the Chinese Academy of Sciences (No. KJCX2-SW-H07) and the “863 project” (No. 2002AA326100).
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Wang, H., Song, Hr., Chen, Xs. et al. Release of ibuprofen from PEG-PLLA electrospun fibers containing poly(ethylene glycol)-b-poly(α-hydroxy octanoic acid) as an additive. Chin J Polym Sci 28, 417–425 (2010). https://doi.org/10.1007/s10118-010-9041-x
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DOI: https://doi.org/10.1007/s10118-010-9041-x