Characterization of a compact and highly sensitive fluorescence-based detection system for point-of-care applications

Uwadiae Obahiagbon, Dixie Kullman, Joseph T. Smith, Benjamin A. Katchman, Hany Arafa, Karen Anderson, Jennifer Blain Christen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

This work details the design and characterization of a low-cost, portable and highly sensitive fluorescence detection system intended for use in a compact and disposable point-of-care (POC) device. The detection device leverages time integration to improve the signal to noise ratio (SNR) compared to instantaneous measurements. It also eliminates complicated focusing optics and electronics typically found in bulky and expensive laboratory-scale devices. Characterization was performed by measuring a series of logarithmically scaled dilutions of 1 μm Nile Red fluorescent microspheres immobilized on microscope slides. This approach eliminates assay dependencies and elucidates the actual system performance. A theoretical model that predicts the time-integrated output voltage profile of the sensor was developed; this prediction is useful for evaluating any lens-free fluorescent system based on a set of filters and choice of fluorophore. By relating the fluorophore concentration, system design parameters, and the output voltage, the model matches well with the empirical data and the limit of determination (LOD) for Nile Red is 20 particles. This system provides a sensitive and potentially low-cost device for fluorescent diagnosis in an integrated and compact/miniaturized POC device, lab-on-chip or a table-top reader.

Original languageEnglish (US)
Title of host publication2016 IEEE Healthcare Innovation Point-of-Care Technologies Conference, HI-POCT 2016
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages117-120
Number of pages4
ISBN (Electronic)9781509011667
DOIs
StatePublished - Dec 27 2016
Event2016 IEEE Healthcare Innovation Point-of-Care Technologies Conference, HI-POCT 2016 - Cancun, Mexico
Duration: Nov 9 2016Nov 11 2016

Other

Other2016 IEEE Healthcare Innovation Point-of-Care Technologies Conference, HI-POCT 2016
CountryMexico
CityCancun
Period11/9/1611/11/16

ASJC Scopus subject areas

  • Health Informatics
  • Medicine (miscellaneous)

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