Resonance energy transfer based electrochemiluminescence and fluorescence sensing of riboflavin using graphitic carbon nitride quantum dots

Determination of malachite green in fish based on magnetic molecularly imprinted polymer extraction followed by electrochemiluminescence.

Electrochemiluminescence (ECL) has attracted much attention in various fields of analysis owing to low background signals, high sensitivity, and excellent controllability. In recent years, to further boost the performance of biosensors, diverse output signal modes have been developed, which exhibited respective advantages. In this review, we summarize the latest sensing applications of ECL bioanalysis by generalizing different output signal modes and give future perspectives for new developments in ECL analytical technology.

Electrochemiluminescence biosensing based on different modes of switching signals

Based on Ru(bpy)32+-Au nanoparticles decorated multi-walled carbon nanotubes composites and a molecularly imprinted polymer (MIP), we propose a novel molecularly imprinted electrochemiluminescence (ECL) sensor to selectively determine isoniazid (INH). The MIP is synthesized through electrochemical copolymerization of acrylamide and N,N′-methylene diacrylamide in the presence of INH template molecules. The enhanced ECL intensity is linear in the range of 0.1 to 110 μg cm−3 and the detection limit is 0.08 μg cm−3 (3σ) INH with relative standard deviation 3.8% (n = 6) for 8 μg cm−3. As a result, the sensor has been successfully applied to the determination of INH in human urine and pharmaceutical samples. Moreover, the possible ECL mechanism is discussed.

A novel molecularly imprinted electrochemiluminescence sensor for isoniazid detection.

Disposable biosensor based on cathodic electrochemiluminescence of tris(2,2-bipyridine)ruthenium(II) for uric acid determination.

Electrochemiluminescence (ECL) of Ru(bpy)32+ using metabolites of catecholamines: homovanillic acid (HVA) and vanillylmandelic acid (VMA) as co-reactants were investigated in aqueous solution for the first time. When HVA and VMA were co-existent in the buffer solution containing Ru(bpy)32+, ECL peaks were observed at a potential corresponding to the oxidation of Ru(bpy)32+, and the ECL intensity was increased noticeably when the concentrations of HVA and VMA were at lower levels. The linear calibration range was from 8.0 × 10−5 to 1.0 × 10−9 M for HVA and VMA. The detection limit (S/N = 3) of HVA and VMA was 4.0 × 10−10 M. The formation of the excited state Ru(bpy)32+* was confirmed to result from the reaction between Ru(bpy)33+ and the intermediates of HVA or VMA radicals. Moreover, it was found that the ECL intensity was quenched significantly when the concentrations of HVA and VMA were relatively higher. The mechanism of self-quenching processes involved in the Ru(bpy)32+–HVA and –VMA ECL systems are proposed in this study.

Self-quenching in the electrochemiluminescence of tris(2,2′-bipyridyl) ruthenium(II) using metabolites of catecholamines as co-reactants

The invention provides a modified electrode based on a functionalized multi-walled carbon nanotube, an electrochemical system and application thereof. In the presence of AA (ascorbic acid) and UA (uric acid), a glassy carbon electrode volt-ampere sensor modified by the f-MWCNT (functionalized multi-walled carbon nanotube) made from SDS (sodium dodecyl sulfate) can be used for sensitively detecting DA (dopi amine). The f-MWCNT-glassy carbon electrode sensor not only has high oxidative and catalytic activity for the DA and the UA, but also can completely eliminate interference of the AA with the DA and simultaneously well distinguish the DA from the UA, thereby detecting the DA. A detection line for the DA by means of square wave voltammetry is 2.0X10-8, and the sensor has fine sensitivity, selectivity and stability.

Modified electrode based on functionalized multi-walled carbon nanotube, electrochemical system and application thereof

Cathodic electrochemiluminescence of tris(2,2′-bipyridine) ruthenium(II) on Ag nanoparticles-modified electrode

The novel phenomenon of cathodic electrochemiluminescence on a gold electrode in tris(bipyridine) ruthenium(II) (Ru(bpy)(3)(2+)) solution is described for the first time. A cathodic electrochemiluminescence (ECL) was found to mainly occur at 0.4-0.8 V with continuous potential scanning from 0.2-1.4 V and the ECL peak was observed around 0.68 V, which was quite different from generally reported Ru(bpy)(3)(2+) ECL. Our group speculated that Ru(bpy)(3)(2+) possibly reacts with the gold electrode in the acidic phosphate buffer solution (PBS) to generate luminescence. The possible ECL mechanism was discussed according to the presented results. Moreover, it is revealed that the Au as co-reactant in the Ru-system contributed dominantly to the whole ECL. Therefore, the reaction between Ru(bpy)(3)(2+) and the newly formed Au implied that the inert metal Au could become a promising material for ECL investigations.

Novel cathodic electrochemiluminescence of tris(bipyridine) ruthenium(II) on a gold electrode in acidic solution

The utility model discloses an electrochemical luminescence detection cell. The electrochemical luminescence detection cell comprises a detection cell body, a baseboard, a liquid storage cell, an optical glass window, a working electrode, a reference electrode, a reference electrode mounting hole, an auxiliary electrode, an auxiliary electrode mounting hole and air vent holes, wherein the detection cell body is connected with the baseboard through screws; the liquid storage cell is formed in the center of the detection cell body; the bottom of the detection cell body is opposite to the optical glass window; the optical glass window and the detection cell body are sealed through a rubber gasket; a light transmission hole is formed in the center of the baseboard; the reference electrode mounting hole and the reference electrode mounting hole are communicated with the liquid storage cell respectively; and two sides of the liquid storage cell have an air vent hole respectively, and the air vent holes are communicated with the liquid storage cell and the reference electrode mounting hole as well as the liquid storage cell and the auxiliary electrode mounting hole respectively. Through the electrochemical luminescence detection cell, the defects of large volume, unfixed working electrodes and the like of the conventional electrochemical luminescence detection cell are overcome. The electrochemical luminescence detection cell has the advantages of a small amount of provided test liquid, fixed working electrodes, high popularity and the like and is easy to disassemble and clean.

Electrochemical luminescence detection cell

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