title: Fluorescent and cross-linked organic-inorganic hybrid nanoshells for monitoring drug delivery.
abstract: Functionalized and monodisperse nanoshells have attracted significant attention owing to their well-defined structure, unique properties, and wide range of potential applications. Here, the synthesis of cross-linked organic-inorganic hybrid nanoshells with strong fluorescence properties was reported via a facile precipitation polymerization of hexachlorocyclotriphosphazene (HCCP) and fluorescein on silica particles used as templates. The resulting poly(cyclotriphosphazene-co-fluorescein) (PCTPF) nanoshells were firm cross-linked shells with ∼2.2 nm mesopores that facilitated the transport of drug molecules. The fluorescent nanoshells also exhibited excellent water dispersibility and biocompatibility; thus, they can be considered as ideal drug vehicles with high doxorubicin storage capacity (26.2 wt %) and excellent sustained release (up to 14 days). Compared to doxorubicin (DOX) alone, the PCTPF nanoshells more efficiently delivered DOX into and killed cancer cells. Moreover, the PCTPF nanoshells also exhibited remarkable fluorescent emission properties and improved photobleaching stability in both suspension and solid state owing to the covalent immobilization of fluorescein in the highly cross-linked organic-inorganic hybrids. The exceptional fluorescent properties enabled the release of DOX as well as the distribution of nanoshells and DOX to be monitored.
authors: School of Chemistry and Chemical Technology, State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University , Shanghai 200240, P. R. China.
authors: Lijuan
authors: L
authors: Sun
authors: Tianhui
authors: T
authors: Liu
authors: Hua
authors: H
authors: Li
authors: Liang
authors: L
authors: Yang
authors: Lingjie
authors: L
authors: Meng
authors: Qinghua
authors: Q
authors: Lu
authors: Jiangang
authors: J
authors: Long
mesh_terms: D000970:Antineoplastic Agents / Q000737:chemistry / Q000494:pharmacology; D002470:Cell Survival / Q000187:drug effects; D004317:Doxorubicin / Q000737:chemistry / Q000494:pharmacology; D004337:Drug Carriers / Q000737:chemistry*; D019793:Fluorescein / Q000737:chemistry; D005456:Fluorescent Dyes / Q000737:chemistry* / Q000378:metabolism; D006367:HeLa Cells; D006801:Humans; D008856:Microscopy, Fluorescence; D057145:Nanoshells / Q000737:chemistry* / Q000648:ultrastructure; D010753:Phosphoranes / Q000737:chemistry; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry
chemical_list: D000970:Antineoplastic Agents; D004337:Drug Carriers; D005456:Fluorescent Dyes; D010753:Phosphoranes; D012822:Silicon Dioxide; D004317:Doxorubicin; C022601:hexachlorocyclotriphosphazene; D019793:Fluorescein
keywords: doxorubicin (DOX); drug delivery; fluorescence; nanoshells; poly(cyclotriphosphazene-co-fluorescein) (PCTPF)