Imaging Science and Photochemistry ›› 2018, Vol. 36 ›› Issue (2): 178-186.DOI: 10.7517/j.issn.1674-0475.2018.02.007

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A Turn-on Fluorometric Sensor for Al3+ in Aqueous Medium with Cell Imaging Application

FENG Jia, YU Fang, WANG Yu   

  1. School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, Shanxi, P. R. China
  • Received:2017-05-04 Revised:2017-07-04 Online:2018-03-15 Published:2018-03-15

Abstract: Based on the inhibition of C=N isomerization and chelation-enhanced fluorescence (CHEF), the simple Schiff base 1-(2-pyridylmethyleneimino) naphthalen-2-ol (L) acts as an effective fluorometric sensor for Al3+ in buffered semi-aqueous medium. L exhibited selective fluorescence enhancement upon binding Al3+as a detection response, which giving strong blue emission (438 nm). The sensitivity of the fluorescent based assay (80.5 nmol/L) for Al3+ is far below the limit recommended in the World Health Organization (WHO) guidelines for drinking water (7.41 μmol/L). L was successfully applied to detect intracellular Al3+ in human SiHa cells through fluorescence microscopic imaging. The interaction between the sensor and Al3+ has been investigated in detail by NMR and HRMS analysis.

Key words: Schiff base, fluorescence probe, detection, Al3+, cell imaging