Magnetic acoustic resonance immunoassay (MARIA): A multifrequency acoustic approach for the non-labelled detection of biomolecular interactions

Bernardita Araya-Kleinsteuber, Ana C.A. Roque, Eleftheria Kioupritzi, Adrian C. Stevenson, Christopher R. Lowe

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

A unique sensing platform, comprising an electromagnetic field detector and an acoustic resonator, has been used as a wireless system for remote sensing of biorecognition events. The MARS (Magnetic Acoustic Resonator Sensor) technique has proven useful for detecting the formation of protein multilayers derived from specific binding phenomena. The technique enables multifrequency analysis, without the need of electrodes attached to the sensing element, and also facilitates the in situ surface modification of the substrate for antibody attachment. The MARS sensor was utilized as the platform on which a standard immunoassay was carried out. Two different conditions for the attachment of the first antibody to the quartz surface were tested: (i) Adsorption of the antibody onto the surface of a bare quartz disc; (ii) covalent immobilization of the antibody to a chemically modified quartz surface. Both methods can be successfully utilized for the 'label-less' detection of the biorecognition event between goat IgG and anti-goat IgG by analysis of the multi-frequency spectrum. Covalent attachment of the primary antibody results in a more efficient immobilization, with higher surface density, and a consistently enhanced response for the binding of the secondary antibody. This approach will be of interest to life scientists and biochemists that require high performance assay methodologies that do not use chemical labels.

Original languageEnglish
Pages (from-to)379-385
Number of pages7
JournalJournal of Molecular Recognition
Volume19
Issue number4
DOIs
Publication statusPublished - Jul 2006

Keywords

  • Acoustic sensor
  • Biorecognition
  • Evanescent wave
  • Frequency shift
  • Immunoassay
  • MARS
  • Multifrequency spectra

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