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目的1.以葡聚糖-超顺磁氧化铁纳米粒(dextran-superparamagnetic iron oxide nanoparticles, dextran-SPIO-NPs)为阳性对照,对本课题组已经制备好的羧甲基壳聚糖-超小超顺磁氧化铁纳米粒(o-carboxymethyl chitosans ultrasmall superparamagnetic iron oxide nanoparticles, OCMCS-USPIO-NPs)和叶酸-羧甲基壳聚糖-超小超顺磁氧化铁纳米粒(Foli