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广西师范大学学报(自然科学版) ›› 2012, Vol. 30 ›› Issue (4): 59-66.
蒋治良1,2, 姚东梅1,2, 韦燕燕1,2
JIANG Zhi-liang1,2, YAO Dong-mei1,2, WEI Yan-yan1,2
摘要: 在pH2.8 HCOOH-HCOONa缓冲溶液中,半胱氨酸(Cys)可与金铂纳米粒子(AuPtNP)作用发生聚集,导致深红色的金铂纳米微粒变成蓝紫色。AuPtNP对甲酸还原磷钼酸生成磷钼蓝反应具有较强的催化作用,而金铂纳米粒子聚集体(AuPtNPA)的催化作用较弱。随着Cys浓度增大,体系中AuPtNPA增多,而AuPtNP减少,催化能力随之减弱,磷钼蓝在700 nm处的吸光度值降低,Cys浓度在30~350 nmol/L与其吸光度降低值ΔA呈良好的线性关系,检测限为28 nmol/L,表观摩尔吸光系数为1.8×106 L·mol-1·cm-1。据此建立了测定半胱氨酸的纳米金铂催化光度分析新方法。
中图分类号:
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