Abstract
Anovel "off-on" electrochemiluminescence (ECL) aptasensor based on ECL resonance energy transfer (RET) system from 3,4,9,10-perylenetetracar-boxylic acid/the metal-organic frameworks NH2-MIL-125(Ti) (PTCA/NH2-MIL-125) to Au nanoparticles (Au NPs) was put forward for microcystin-LR (MC-LR) assay. The electrochemiluminescence (ECL) emission spectra of PTCA/NH2-MIL-125 show excellent spectral overlap with the UV-vis absorption spectrum of Au NPs. A linear response ranging from 10fM (9.95 × 10-6μgL-1) to 0.1μM (99.5μgL-1) was obtained, and the detection limit was 3.6fM (3.58 × 10-6μgL-1) under optimal conditions at apotential of - 1.6V (S/N = 3). Besides, the prepared ECL-RET MC-LR aptasensor exhibited good selectivity and stability. Graphical abstract.
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