合成了以对苯二甲酰基(TP)为连接体的双核Gd-DTTA(DTTA:二乙三胺四乙酸)线型磁共振造影剂Gd2(TP(DTTA)2).在20 MHz、37℃和pH =7的条件下,此造影剂对水质子的纵向弛豫效率为21.7 L/(mmol·s),比已有的双核Gd-DTTA型磁共振造影剂提高了70％.荧光寿命测试显示,T2(TP(DTTA)2)的内配层水分子数q=1.4.结果显示,刚性连接链有利于提高多核造影剂的弛豫效率.
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