Miniaturized analytical instrumentation for electrochemiluminescence assays: a spectrometer and a photodiode-based device

Abstract

Herein, a new miniaturized analytical instrumentation for electrochemiluminescence (ECL) assays is presented. A photodiode integrated in an ECL cell combined with a potentiostat/galvanostat, all integrated in a one-piece instrument (μSTAT ECL), was developed. In addition, a complementary micro-spectrometer integrated in a similar ECL cell for luminescence spectra recording is also proposed. Both cells are intended to be used with screen-printed electrodes and all the devices are portable and small sized. Their performance was corroborated with two innovative proofs-of-concept that centered on the luminol transduction chemistry: a first time reported ECL assay based on the enzymatic reaction between an indoxyl substrate and the enzyme alkaline phosphatase, and the electrochemiluminescence resonance energy transfer (ECL-RET) process triggered by the electro-oxidized luminol to the acceptor fluorescein. The photodiode system revealed to be more sensitive than the spectrometer device in collecting the light; however, with the latter, it is possible to discriminate different luminescent species according to their maximum wavelength emission, which is extremely useful for carrying out simple and simultaneous ECL multiplex analyzes. The spectrometer device works as an excellent accessory to couple with the μSTAT ECL instrument, complementing the experiments.

Schematic representation of the ECL-RET: from luminol–H2O2 system to fluorescein, the micro-spectrometer for the light collection and the 3D representation of the ECL-RET reaction.

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Correspondence to Pablo Fanjul-Bolado.

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Published in the topical collection Analytical Electrochemiluminescence with guest editors Hua Cui, Francesco Paolucci, Neso Sojic, and Guobao Xu.

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Neves, M.M.P.S., Bobes-Limenes, P., Pérez-Junquera, A. et al. Miniaturized analytical instrumentation for electrochemiluminescence assays: a spectrometer and a photodiode-based device. Anal Bioanal Chem 408, 7121–7127 (2016). https://doi.org/10.1007/s00216-016-9669-7

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Keywords

  • Electrochemiluminescence
  • Portable instrumentation
  • Screen-printed electrode
  • Miniaturized photodiode and spectrometer
  • Luminol
  • Alkaline phosphatase