The effect of polymer blends on initial release regulation and in vitro-in vivo relationship of peptides loaded PLGA-Hydrogel Microspheres
| Autor: | Zilin Song, Pan Qi, Yidan Wang, Puxiu Wang, Jin Chen, Xing Tang, Peifu Xiao, Haibing He |
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| Rok vydání: | 2020 |
| Předmět: |
Diffusion
Chemistry Pharmaceutical Pharmaceutical Science macromolecular substances 02 engineering and technology 030226 pharmacology & pharmacy Autocatalysis 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine Polylactic Acid-Polyglycolic Acid Copolymer In vivo Lactic Acid Particle Size Aqueous solution Goserelin Acetate technology industry and agriculture Hydrogels 021001 nanoscience & nanotechnology In vitro Microspheres PLGA chemistry Chemical engineering Polymer blend 0210 nano-technology Peptides Polyglycolic Acid |
| Zdroj: | International journal of pharmaceutics. 591 |
| ISSN: | 1873-3476 |
| Popis: | The aim of this study was to resolve the lag time problem for peptides loaded PLGA-Hydrogel Microspheres (PLGA-gel-Ms) by blending low molecular PLGA (Mw. 1 kDa) into PLGA (Mw. 10 kDa) as an intrinsic porogen, and then assess the in vitro-in vivo relationship (IVIVR). Here, Goserelin acetate (GOS) was chosen as the model peptides. When compared to additional types of porogen, the intrinsic porogen avoided impurities remaining and protected the bioactivities of the peptides. By adding 10% PLGA (Mw. 1 kDa), the lag time was eliminated both in vitro and in vivo with a desirable EE (97.04% ± 0.51%). The release mechanisms were found to be: a) initial GOS release mainly controlled by pores diffusion and b) autocatalysis of PLGA (Mw. 1 kDa) which increased the quantity of aqueous pores, as revealed by SEM images. To solve the challenges caused by multiphasic release profiles, for the first time the Segmented phases IVIVR were proposed and developed, and showed improved linear fitting effects and supported the proposed release mechanisms. The application of PLGA blends could provide a new insight into PLGA microsphere initial release rate regulation. |
| Databáze: | OpenAIRE |
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