Chemical Research in Chinese Universities ›› 2015, Vol. 31 ›› Issue (5): 724-729.doi: 10.1007/s40242-015-5124-0

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A Highly Selective and Sensitive Ratiometric Fluorescent Probe for pH Measurement Based on Fluorescence Resonance Energy Transfer

LIANG Fanghui1, WANG Di2, MA Pinyi2, WANG Xinghua2, SONG Daqian2, YU Yong3   

  1. 1. Department of Pharmacy, Changchun Medical College, Changchun 130031, P. R. China;
    2. College of Chemistry, Jilin University, Changchun 130012, P. R. China;
    3. College of Instrumentation & Electrical Engineering, Jilin University, Changchun 130061, P. R. China
  • Received:2015-03-30 Revised:2015-05-06 Online:2015-10-01 Published:2015-05-25
  • Contact: YU Yong, E-mail: yuyong@jlu.edu.cn E-mail:yuyong@jlu.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(Nos.21405057, 21207047) and the Science and Technology Developing Foundation of Jilin Province, China(No.20125006).

Abstract:

Fluorescein-rhodamine 6G(Flu-Rh) was synthesized and used as the fluorescence probe for pH measurement based on fluorescence resonance energy transfer(FRET). In the probe, fluorescein fluorophore and pH-sensitive rhodamine 6G hydrazide were used as FRET donor and acceptor, respectively. The values of acidity constant(pKa) and fluorescence quantum yield(Φ) of Flu-Rh were 3.71 and 0.72, respectively. The fluorescence efficiency of Flu-Rh remains almost constant when the pH value of the sample solution changed 10 times in a range of 4.78-7.03 continuously. The present probe is simple and easy-to-use for the pH measurement in acidic media.

Key words: Fluorescence resonance energy transfer(FRET), Ratiometric, Fluorescein, Rhodamine 6G, pH