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Issue 5, 2013
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All-thermoplastic nanoplasmonic microfluidic device for transmission SPR biosensing

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Early and accurate disease diagnosis still remains a major challenge in clinical settings. Biomarkers could potentially provide useful tools for the detection and monitoring of disease progression, treatment safety and efficacy. Recent years have witnessed prodigious advancement in biosensor development with research directed towards rapid, real-time, label-free and sensitive biomarker detection. Among emerging techniques, nanoplasmonic biosensors pose tremendous potential to accelerate clinical diagnosis with real-time multiplexed analysis, rapid and miniaturized assays, low sample consumption and high sensitivity. In order to translate these technologies from the proof-of-principle concept level to point of care clinical diagnosis, integrated, portable devices having small footprint cartridges that house low-cost disposable consumables are sought. Towards this goal, we developed an all-polymeric nanoplasmonic microfluidic (NMF) transmission surface plasmon resonance (SPR) biosensor. The device was fabricated in thermoplastics using a simple, single step and cost-effective hot embossing technique amenable to mass production. The novel 3D hierarchical mold fabrication process enabled monolithic integration of blazed nanogratings within the detection chambers of a multichannel microfluidic system. Consequently, a single hard thermoplastic bottom substrate comprising plasmonic and fluidic features allowed integration of active fluidic elements, such as pneumatic valves, in the top soft thermoplastic cover, increasing device functionality. A simple and compact transmission-based optical setup was employed with multiplexed end-point or dual-channel kinetic detection capability which did not require stringent angular accuracy. The sensitivity, specificity and reproducibility of the transmission SPR biosensor was demonstrated through label-free immunodetection of soluble cell-surface glycoprotein sCD44 at clinically relevant picomolar to nanomolar concentrations.

Graphical abstract: All-thermoplastic nanoplasmonic microfluidic device for transmission SPR biosensing

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Publication details

The article was received on 05 Oct 2012, accepted on 22 Nov 2012 and first published on 28 Nov 2012

Article type: Paper
DOI: 10.1039/C2LC41123G
Citation: Lab Chip, 2013,13, 798-810
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    All-thermoplastic nanoplasmonic microfluidic device for transmission SPR biosensing

    L. Malic, K. Morton, L. Clime and T. Veres, Lab Chip, 2013, 13, 798
    DOI: 10.1039/C2LC41123G

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