A 1,8 naphthalimide anchor rhodamine B based FRET probe for ratiometric detection of Cr3+ion in living cells
作者:Susanta Adhikari、Sabyasachi Ta、Avijit Ghosh、Subhajit Guria、Abhishek Pal、Manisha Ahir、Arghya Adhikary、Sumit Kumar Hira、Partha Pratim Manna、Debasis Das
DOI:10.1016/j.jphotochem.2018.12.010
日期:2019.3
A 2-(1,3-dioxo-1H-benzo[de]isoquinolin-2(3H)-yl)acetaldehydeanchored rhodamine B based probe, RDNAP detects Cr3+ ion by fluorescence resonance energy transfer (FRET) process in aqueous buffered acetonitrile media (7:3, v/v). Conversely, conjugation of 2-(1,3-dioxo-6-(piperidin-1-yl)-1H-benzo[de]isoquinolin-2(3H)-yl) acetaldehyde with rhodamine B provides another probe, RDNAP-PY that undergoes Cr3+ assisted ratiometric fluorescence and colorimetric change in the same media. RDNAP-PY provides higher FRET efficiency and detects as low as 1.81 x 10(-6) M Cr3+ with an association constant, 15.9 x 104 M-1. Other common ions do not interfere. RDNAP-PY efficiently images intracellular Cr3+ in live Hep3B, MCF-7, HeLa, SiHa and HEK 293T cells under fluorescence microscope in a ratiometric and time dependent manner. H-1 NMR titration and DFT studies strongly support experimental findings.