YAN-PING CHENSHAN-HUI HSU2020-01-062020-01-062014https://scholars.lib.ntu.edu.tw/handle/123456789/445875Superparamagnetic iron oxide nanoparticles (SPIO NPs) are widely used in magnetic resonance imaging and magnetic hyperthermia. In this study, we used the self-assembly behavior of biodegradable polyurethane nanoparticles (PU NPs) in water to encapsulate SPIO NPs (SPIO-PU NPs) or hydrophobic model drugs (drug-PU NPs) by an in situ method. PU NPs and SPIO-PU NPs were characterized by dynamic light scattering, transmission electron microscopy, infrared spectroscopy, and thermogravimetric analysis. The superparamagnetic property and magnetic heating ability of SPIO-PU NPs were assessed. PU NPs had no significant cytotoxicity and could be taken up by cells. SPIO-PU NPs were highly efficient in labeling cancer cells with cellular uptake of ?16 pg iron per cell on average. Hydrophobic drugs were entrapped in PU NPs effectively and showed a sustained release profile. Upon heating, the release of drug was accelerated. This proof-of-concept study demonstrated a novel way to encapsulate SPIO and hydrophobic drugs in PU NPs with smart designs for potential applications in cancer diagnostics, hyperthermia, and chemotherapy. ? the Partner Organisations 2014.[SDGs]SDG3Chemotherapy; Design; Infrared spectroscopy; Magnetic resonance imaging; Nanoparticles; Polyurethanes; Superparamagnetism; Thermogravimetric analysis; Transmission electron microscopy; Biodegradable polyurethanes; Cancer diagnostics; Magnetic hyperthermia; Self-assembly behaviors; Superparamagnetic iron oxide nanoparticles; Superparamagnetic iron oxides; Superparamagnetic property; Sustained release; Hydrophobicityjournal article10.1039/c4tb00069b2-s2.0-84899924504https://www.scopus.com/inward/record.uri?eid=2-s2.0-84899924504&doi=10.1039%2fc4tb00069b&partnerID=40&md5=56b976807e0516cfc07fbb903f0fba8d