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Proceedings Paper

Microgels for multiplex and direct fluorescence detection
Author(s): Filippo Causa; Anna Aliberti; Angela Maria Cusano; Edmondo Battista; Paolo Antonio Netti
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Paper Abstract

Blood borne oligonucleotides fragments contain useful clinical information whose detection and monitoring represent the new frontier in liquid biopsy as they can transform the current diagnosis procedure. For instance, recent studies have identified a new class of circulating biomarkers such as s miRNAs, and demonstrated that changes in their concentration are closely associated with the development of cancer and other pathologies. However, direct detection of miRNAs in body fluids is particularly challenging and demands high sensitivity -concentration range between atto to femtomolarspecificity, and multiplexing Here we report on engineered multifunctional microgels and innovative probe design for a direct and multiplex detection of relevant clinical miRNAs in fluorescence by single particle assay. Polyethyleneglycol-based microgels have a coreshell architecture with two spectrally encoded fluorescent dyes for multiplex analyses and are endowed with fluorescent probes for miRNA detection. Encoding and detection fluorescence signals are distinguishable by not overlapping emission spectra. Tuneable fluorescence probe conjugation and corresponding emission confinement on single microgel allows for enhanced target detection. Such suspension array has indeed high selectivity and sensitivity with a detection limit of 10-15 M and a dynamic range from 10-9 to 10-15 M. We believe that sensitivity in the fM concentration range, signal background minimization, multiplexed capability and direct measurement of such microgels will translate into diagnostic benefits opening up new roots toward liquid biopsy in the context of point-of-care testing through an easy and fast detection of sensitive diagnostic biomarkers directly in serum.

Paper Details

Date Published: 22 June 2015
PDF: 7 pages
Proc. SPIE 9529, Optical Methods for Inspection, Characterization, and Imaging of Biomaterials II, 952919 (22 June 2015); doi: 10.1117/12.2185839
Show Author Affiliations
Filippo Causa, Istituto Italiano di Tecnologia (Italy)
Univ. degli Studi di Napoli Federico II (Italy)
Anna Aliberti, Istituto Italiano di Tecnologia (Italy)
Angela Maria Cusano, Istituto Italiano di Tecnologia (Italy)
Edmondo Battista, Istituto Italiano di Tecnologia (Italy)
Univ. degli Studi di Napoli Federico II (Italy)
Paolo Antonio Netti, Istituto Italiano di Tecnologia (Italy)
Univ. degli Studi di Napoli Federico II (Italy)


Published in SPIE Proceedings Vol. 9529:
Optical Methods for Inspection, Characterization, and Imaging of Biomaterials II
Pietro Ferraro; Simonetta Grilli; Monika Ritsch-Marte; David Stifter, Editor(s)

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