食品科学 ›› 2011, Vol. 32 ›› Issue (3 ): 51-55.doi: 10.7506/spkx1002-6630-201103013

• 基础研究 • 上一篇    下一篇

氯化血红素对CdS量子点荧光的猝灭研究及分析应用

张文龙,张俊生,周丽萍,陈莉华*   

  1. 吉首大学化学化工学院,湖南吉首 416000
  • 收稿日期:2010-03-17 修回日期:2011-01-04 出版日期:2011-02-15 发布日期:2011-01-13
  • 通讯作者: 陈莉华 E-mail:chenlihua99@163.com
  • 基金资助:

    湖南省教育厅自科基金重点项目(05A009);湖南大学化学生物传感与计量学国家重点实验室开放课题(2005019);吉首大学回校博士基金资助项目(JD05001)

Fluorescence Quenching Mechanism of CdS Quantum Dots by Hemin and Its Application

ZHANG Wen-long,ZHANGF Jun-sheng,ZHOU Li-ping,CHEN Li-hua   

  1. College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China
  • Received:2010-03-17 Revised:2011-01-04 Online:2011-02-15 Published:2011-01-13
  • Contact: CHEN Li-hua E-mail:chenlihua99@163.com

摘要: 以巯基乙酸为稳定剂及表面修饰剂,在水溶液中合成了平均粒径为2.9nm 左右的CdS 量子点,该量子点在512.4nm 波长处有强的源于表面阱的空穴电子重组形成的表面态发射峰,加入的氯化血红素通过扩散和碰撞作用可将电子转移至CdS 量子点的空穴中导致量子点荧光发生动态猝灭,并在此基础上建立了测定氯化血红素的新型荧光分析法。在最佳测定条件下,当氯化血红素的质量浓度为5.0 × 10-6~25.0 × 10-6g/mL 时,体系的相对荧光强度(F)与氯化血红素的质量浓度(ρ)呈线性关系,线性回归方程为:F=719.09 - 14.01 × 10-6ρ,检出限为3.35 × 10-8g/mL。测定血清样品基底中氯化血红素的含量并获得满意结果。

关键词: CdS量子点, 氯化血红素, 电子转移, 荧光猝灭

Abstract: CdS quantum dots were synthesized in aqueous solution by using mercaptoethylic acid as the stabilizer and surface-modification reagent. The 512.4 nm fluorescence emission which was caused by the cavity-electron recombination on surface trap of CdS quantum dots was quenched in the presence of hemin. The quenching mechanism was a dynamic process based on electron transfer between Fe2+ of hemin and cavity of CdS quantum dots. Under optimal conditions, a concentration of 5.0×10-6-25.0×10-6 g/mL of hemin could be determined on the basis of the decrease ratio of fluorescence intensity of CdS quantum dots, with a detection limit of 3.35×10-8 g/mL. The proposed method was utilized to analyze the blood serum sample in which hemin was added with satisfactory results.

Key words: CdS quantum dots, hemin, electron transfer, fluorescence quenching

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