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- W2042680795 abstract "The aggregation of poly(alpha-hydroxy acid) microspheres during ethylene oxide (EO) gas sterilization makes it difficult for the microspheres to be used in clinical applications. In this study, six kinds of PLLA-PEG-PLLA triblock copolymers (TriPLE) were synthesized with various composition ratios of PEG/PLLA in the range of 0.012 to 0.103. TriPLE microspheres were prepared by the oil-in-water emulsion method. TriPLE microspheres were characterized by using 1H-NMR, gel permeation chromatography (GPC), and differential scanning calorimetry (DSC). After sterilization by EO gas at 55 degrees C, the microspheres were analyzed by scanning electron microscope (SEM), laser diffractometry, standard sieves, X-ray diffraction (XRD), GPC, and DSC. When the composition ratio of PEG/PLLA was above 0.02, the initial crystallinity of TriPLE in microspheres was as high as 50%, and the microspheres were suitable to be sterilized by EO gas. On the other hand, TriPLE microspheres, which had composition ratios of PEG/PLLA below 0.02, had low initial crystallinities of about 30%, and aggregated during EO gas sterilization. For these microspheres, crystallinity increased up to 50% during the sterilization, whereas other TriPLE microspheres did not show any changes in crystallinity. Therefore, the aggregation of TriPLE microspheres during EO gas sterilization was markedly reduced as the initial crystallinity of TriPLE in the microspheres was increased." @default.
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- W2042680795 date "2001-01-01" @default.
- W2042680795 modified "2023-10-03" @default.
- W2042680795 title "Effects of ethylene oxide gas sterilization on physical properties of poly(L-lactide)–poly(ethylene glycol)–poly(L-lactide) microspheres" @default.
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- W2042680795 doi "https://doi.org/10.1163/156856201750411666" @default.
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