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Default NMR-DMF: a modular nuclear magnetic resonance-digital microfluidics system for biological assays.

NMR-DMF: a modular nuclear magnetic resonance-digital microfluidics system for biological assays.

NMR-DMF: a modular nuclear magnetic resonance-digital microfluidics system for biological assays.

Analyst. 2014 Oct 15;

Authors: Lei KM, Mak PI, Law MK, Martins RP

Abstract
We present a modular nuclear magnetic resonance-digital microfluidics (NMR-DMF) system as a portable diagnostic platform for miniaturized biological assays. With increasing number of combinations between designed probes and a specific target, NMR has become an accurate and rapid assay tool, which is capable of detecting particular kinds of proteins, DNAs, bacteria and cells with a customized probe quantitatively. Traditional sample operation (e.g., manipulation and mixing) relied heavily on human efforts. We herein propose a modular NMR-DMF system to allow the electronic automation of multi-step reaction-screening protocols. A figure-8 shaped coil is proposed to enlarge the usable inner space of a portable magnet by 4.16 times, generating a radio frequency (RF) excitation field in the planar direction. By electronically managing the electro-wetting-on-dielectric (EWOD) effects over an electrode array, preloaded droplets with the inclusion of biological constituents and targets can be programmed to mix and be guided to the detection site (3.5 × 3.5 mm(2)) for high-sensitivity NMR screening (static B field: 0.46 T, RF field: 1.43 mT per ampere), with the result (voltage signal) displayed in real-time. To show the system's utility, automated real-time identification of 100 pM of avidin in a 14 ?L droplet was achieved. The system shows promise as a robust and portable diagnostic device for a wide variety of biological analyses and screening applications.


PMID: 25315808 [PubMed - as supplied by publisher]



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