Multiplexed Efficient On-chip Sample Preparation and Sensitive Amplification-free Detection of Ebola Virus

Overview

Journal Biosens Bioelectron

Specialties Biochemistry
Biotechnology

Date 2017 Jan 11

PMID 28073029

Citations 41

Authors

K Du

H Cai

M Park

T A Wall

M A Stott

K J Alfson

A Griffiths

R Carrion

J L Patterson

A R Hawkins

H Schmidt

R A Mathies

Affiliations

Soon will be listed here.

Abstract

An automated microfluidic sample preparation multiplexer (SPM) has been developed and evaluated for Ebola virus detection. Metered air bubbles controlled by microvalves are used to improve bead-solution mixing thereby enhancing the hybridization of the target Ebola virus RNA with capture probes bound to the beads. The method uses thermally stable 4-formyl benzamide functionalized (4FB) magnetic beads rather than streptavidin coated beads with a high density of capture probes to improve the target capture efficiency. Exploiting an on-chip concentration protocol in the SPM and the single molecule detection capability of the antiresonant reflecting optical waveguide (ARROW) biosensor chip, a detection limit of 0.021pfu/mL for clinical samples is achieved without target amplification. This RNA target capture efficiency is two orders of magnitude higher than previous results using streptavidin beads and the limit of detection (LOD) improves 10×. The wide dynamic range of this technique covers the whole clinically applicable concentration range. In addition, the current sample preparation time is ~1h which is eight times faster than previous work. This multiplexed, miniaturized sample preparation microdevice establishes a key technology that intended to develop next generation point-of-care (POC) detection system.

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