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Direct detection of whole bacteria using a nonlinear acoustic resonator

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journal contribution
posted on 11.05.2020, 11:05 by Shilpa Khobragade, Carlos Da-Silva-Granja, Niklas Sandström, Igor Efimov, Victor P Ostanin, Wouter van der Wijngaart, David Klenerman, Sourav GhoshSourav Ghosh

Direct detection of whole vegetative bacteria was investigated employing a quartz crystal resonator (QCR) in its nonlinear regime. Escherichia coli (E. coli) in buffer solution under flow was captured on a QCR in a microfluidic cell using a whole-cell anti-E.coli aptamer. The nonlinear distortion in QCR response due to the ‘pull’ from surface-bound bacteria was measured in realtime as the change in third Fourier harmonic (3f) current and compared with shifts in the traditional acoustic parameters of resonance frequency and dissipation. The change in 3f current showed superior quantitative correlation with E. coli concentrations (105-108 cfu/mL) and at least an order of magnitude better sensitivity than shifts in the traditional acoustic parameters. Most interestingly, underpinned by the strength of bacteria-QCR pull, the nonlinear acoustic principle demonstrated a unique specificity in transduction, even in a mixed sample with another gram-negative bacteria, that can supplement the specificity of the bioreceptors. An analytical expression was derived to quantitatively relate the competing influence of shifts in dissipation and nonlinearity coefficient of the QCR on the change in 3f current. This study demonstrates the potential for reliable direct readout of bioreceptor-mediated binding of whole vegetative bacteria from complex samples using a nonlinear acoustic resonator.

Funding

EU projects RAPP-ID (FP7-JTI 115153)

Norosensor (FP7-NMP604244)

EPSRC Bridging the Gap in Antimicrobial Resistance grant(EP/M027341/1)

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Sensors and Actuators B: Chemical

Volume

316

Pages

128086

Publisher

Elsevier BV

Version

VoR (Version of Record)

Rights holder

© The authors

Publisher statement

This is an Open Access Article. It is published by Elsevier under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/

Acceptance date

03/04/2020

Publication date

2020-04-19

Copyright date

2020

ISSN

0925-4005

Language

en

Depositor

Mr Carlos Da Silva Granja. Deposit date: 9 May 2020

Article number

128086