采用电弧放电法合成和HPLC 2步分离法,得到了纯度为95%以上的Gd@C82.以四丁基氢氧化铵(TBAH)为催化剂,用NaOH溶液对Cd@C82进行羟基衍生化,并利用同步辐射XPS分析其C1s确定Gd@C82羟基化产物的羟基数,得到水溶性的Gd@C82(OH)16.对Gd@C82(OH)16进行了体外弛豫率及体内的核磁共振成像研究.结果表明,与(NMG)2-Gd-DTPA相比,在相同Gd浓度下,Gd@C82(OH)16的质子弛豫率R1提高约3倍,R2提高约7倍.体内核磁成像结果也显示,Gd@C82(OH)16提高了核磁成像对比的效果,其信号在2 h内维持稳定.说明Gd@C82(OH)16在作为磁共振增强剂方面具有较大的潜力.
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