Chem. J. Chinese Universities ›› 2020, Vol. 41 ›› Issue (12): 2736.doi: 10.7503/cjcu20200447

• Analytical Chemistry • Previous Articles     Next Articles

Fluorescent Peptide Sensor for Detection of Copper Ions

A Li1, WANG Yong1,2()   

  1. 1.College of Chemistry
    2.Jiangxi Province Key Laboratory of Modern Analytical Science,Nanchang University,Nanchang 330031,China
  • Received:2020-07-13 Online:2020-12-10 Published:2020-09-01
  • Contact: WANG Yong E-mail:wangyong@ncu.edu.cn

Abstract:

A fluorescent sensor for copper(Ⅱ) ions was developed based on the quenching of rhodamine B-labeled peptide by copper(Ⅱ). The sensing mechanism was studied using resonance light scattering, UV-Vis absorption spectroscopy, fluorescence lifetime, and circular dichroism. The results showed that copper(Ⅱ) might induced the conformational change of the peptide that make rhodamine B approach each other, resulting in the aggregation-caused quenching effect of copper(Ⅱ) and the rhodamine B-labeled peptide. Moreover, the experimental results displayed that the sensor possessed both linear ranges of 5×10?4—1×10?2 μmol/L and 0.1—7 μmol/L with a detection limit of 0.29 nmol/L. The sensor also had a high selectivity for copper(Ⅱ), and can be successfully employed for the detection of copper(Ⅱ) ions in lake water samples.

Key words: Fluorescence sensor, Peptide, Copper(Ⅱ) ion

CLC Number: 

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