Electrochemiluminescence sensor for the detection of Amaranth Red based on ZnMnO₂-accelerator and Luminol...

The synthesis of self-supporting material ZnMnO₂ by electrospinning and high-temperature calcination is reported. A highly sensitive electrochemiluminescence (ECL) sensor for Amaranth Red (AR) detection was constructed using Luminol@Ti₃AlC₂ and ZnMnO₂ with multi-step signal amplification. Luminol-O₂ served as the ECL probe with luminescent signal originating from its reaction with dissolved oxygen. Ti₃AlC₂ was introduced as the carrier to enhance the effective concentration of the ECL reagent and improve the signal. ZnMnO₂ as the co-reaction promoter could further improve the ECL value. The highest signal was attributed to the combined catalytic action of Luminol@Ti₃AlC₂ and ZnMnO₂. A new method for the detection of AR was developed due to the resonance energy transfer (RET) between Luminol and AR. Under optimal conditions, the response to AR exhibited a linear range from 5.0 × 10^-15 to 5.0 × 10^-5 mol·L^-1. The sensor achieved satisfactory AR detection in candy samples.