Rapid detection of trace bacteria in biofluids using porous monoliths in microchannels

Junyu Mai, Vinay V. Abhyankar, Matthew E. Piccini, Juan Olano, Richard Willson, Anson V. Hatch

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

We present advancements in microfluidic technology for rapid detection of as few as 10 rickettsial organisms in complex biological samples. An immuno-reactive filter, macroporous polyacrylamide monolith (PAM), fabricated within a microfluidic channel enhances solid-phase immuno-capture, staining and detection of targeted bacteria. Bacterial cells in samples flowing through the channel are forced to interact with the PAM filter surface due to size exclusion, overcoming common transport and kinetic limitations for rapid (min), high-efficiency (~100%) capture. In the process, targeted cells in sample volumes of 10. μl to >100. μl are concentrated within a sub-50. nl region at the PAM filter edge in the microchannel, thus concentrating them over 1000-fold. This significantly increases sensitivity, as the hydrophilic PAM also yields low non-specific immuno-fluorescence backgrounds with samples including serum, blood and non-targeted bacteria. The concentrated target cells are detected using fluorescently-labeled antibodies. With a single 2.0×2.0×0.3. mm PAM filter, as few as 10 rickettsial organisms per 100. μl of lysed blood sample can be analyzed within 60. min, as compared to hours or even days needed for conventional detection methods. This method is highly relevant to rapid, multiplexed, low-cost point of care diagnostics at early stages of infection where diagnostics providing more immediate and actionable test results are needed to improve patient outcomes and mitigate potential natural and non-natural outbreaks or epidemics of rickettsial diseases.

Original languageEnglish
Pages (from-to)435-441
Number of pages7
JournalBiosensors and Bioelectronics
Volume54
DOIs
StatePublished - Apr 15 2014

Fingerprint

Microchannels
Polyacrylates
Bacteria
Microfluidics
Blood
Point-of-Care Systems
Antibodies
Disease Outbreaks
Fluorescence
polyacrylamide
Staining and Labeling
Technology
Costs and Cost Analysis
Kinetics
Infection
Serum
Costs

Keywords

  • Blood borne bacteria detection
  • Macroporous monolith filter
  • Microfluidic device
  • Point-of-care diagnostic assay
  • Polyacrylamide monolith
  • Rickettsia detection

ASJC Scopus subject areas

  • Biophysics
  • Biomedical Engineering
  • Biotechnology
  • Electrochemistry

Cite this

Rapid detection of trace bacteria in biofluids using porous monoliths in microchannels. / Mai, Junyu; Abhyankar, Vinay V.; Piccini, Matthew E.; Olano, Juan; Willson, Richard; Hatch, Anson V.

In: Biosensors and Bioelectronics, Vol. 54, 15.04.2014, p. 435-441.

Research output: Contribution to journalArticle

Mai, Junyu ; Abhyankar, Vinay V. ; Piccini, Matthew E. ; Olano, Juan ; Willson, Richard ; Hatch, Anson V. / Rapid detection of trace bacteria in biofluids using porous monoliths in microchannels. In: Biosensors and Bioelectronics. 2014 ; Vol. 54. pp. 435-441.
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