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- W3045444893 abstract "Liposomes have been broadly used in pharmaceutical field to overcome oral absorption barriers, such as gastric acid, tenacious mucus or intestinal epithelia. However, the concrete in vivo absorption mechanisms of liposomes are still indistinct. This study aims to visually elucidate the effect of particle size and surface characteristics on in vivo translocation of oral liposomes by fluorescence resonance energy transfer (FRET) effect. We fabricated liposomes of various sizes (100 nm, 200 nm and 500 nm) and surface characteristics (anionic, cationic and PEGylated) which are also labeled with FRET probes for discriminating the intact liposomes. We then investigated the in vivo fate of those different liposomes upon oral administration. Results showed that smaller conventional liposomes, cationic and PEGylated liposomes had longer retention time in digestive tract. Few intact liposomes were taken up by intestinal epithelial cells and none were found in circulation. In vivo pharmacokinetics revealed that the smaller, cationic or PEGylated liposomes had higher relative bioavailability. Similar retention time of various liposomes in blood circulation to control solution indicated that liposomes improved oral drug absorption by either prolonging contact time with gastrointestinal tract or increasing penetration ability through mucus barrier, instead of being absorbed integrally into circulation. This study offered new insight into developing highly effective liposomes for oral delivery." @default.
- W3045444893 created "2020-07-29" @default.
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- W3045444893 date "2020-09-01" @default.
- W3045444893 modified "2023-09-26" @default.
- W3045444893 title "Insight into the in vivo translocation of oral liposomes by fluorescence resonance energy transfer effect" @default.
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- W3045444893 doi "https://doi.org/10.1016/j.ijpharm.2020.119682" @default.
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