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Structural shimming for high-resolution nuclear magnetic resonance spectroscopy in lab-on-a-chip devices

Structural shimming for high-resolution nuclear magnetic resonance spectroscopy in lab-on-a-chip devices
Structural shimming for high-resolution nuclear magnetic resonance spectroscopy in lab-on-a-chip devices
High-resolution proton NMR spectroscopy is well-established as a tool for metabolomic analysis of biological fluids at the macro scale. Its full potential has, however, not been realised yet in the context of microfluidic devices. While microfabricated NMR detectors offer substantial gains in sensitivity, limited spectral resolution resulting from mismatches in the magnetic susceptibility of the sample fluid and the chip material remains a major hurdle. In this contribution, we show that susceptibility broadening can be avoided even in the presence of substantial mismatch by including suitably shaped compensation structures into the chip design. An efficient algorithm for the calculation of field maps from arbitrary chip layouts based on Gaussian quadrature is used to optimise the shape of the compensation structure to ensure a flat field distribution inside the sample area. Previously, the complexity of microfluidic NMR systems has been restricted to simple capillaries to avoid susceptibility broadening. The structural shimming approach introduced here can be adapted to virtually any shape of sample chamber and surrounding fluidic network, thereby greatly expanding the design space and enabling true lab-on-a-chip systems suitable for high-resolution NMR detection
1473-0197
1678-1685
Ryan, Herbert
4beece80-5254-409f-b21d-f3a962316360
Smith, Alison
6e9e908e-6c05-4cab-9b87-17d58061115a
Utz, Marcel
c84ed64c-9e89-4051-af39-d401e423891b
Ryan, Herbert
4beece80-5254-409f-b21d-f3a962316360
Smith, Alison
6e9e908e-6c05-4cab-9b87-17d58061115a
Utz, Marcel
c84ed64c-9e89-4051-af39-d401e423891b

Ryan, Herbert, Smith, Alison and Utz, Marcel (2014) Structural shimming for high-resolution nuclear magnetic resonance spectroscopy in lab-on-a-chip devices. Lab on a Chip, 14 (10), 1678-1685. (doi:10.1039/C3LC51431E). (PMID:24658666)

Record type: Article

Abstract

High-resolution proton NMR spectroscopy is well-established as a tool for metabolomic analysis of biological fluids at the macro scale. Its full potential has, however, not been realised yet in the context of microfluidic devices. While microfabricated NMR detectors offer substantial gains in sensitivity, limited spectral resolution resulting from mismatches in the magnetic susceptibility of the sample fluid and the chip material remains a major hurdle. In this contribution, we show that susceptibility broadening can be avoided even in the presence of substantial mismatch by including suitably shaped compensation structures into the chip design. An efficient algorithm for the calculation of field maps from arbitrary chip layouts based on Gaussian quadrature is used to optimise the shape of the compensation structure to ensure a flat field distribution inside the sample area. Previously, the complexity of microfluidic NMR systems has been restricted to simple capillaries to avoid susceptibility broadening. The structural shimming approach introduced here can be adapted to virtually any shape of sample chamber and surrounding fluidic network, thereby greatly expanding the design space and enabling true lab-on-a-chip systems suitable for high-resolution NMR detection

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Accepted/In Press date: 27 February 2014
Published date: 27 February 2014
Organisations: Chemistry, Magnetic Resonance

Identifiers

Local EPrints ID: 396251
URI: http://eprints.soton.ac.uk/id/eprint/396251
ISSN: 1473-0197
PURE UUID: 974b1c13-2692-4cb5-9d21-5d4bc2b27003
ORCID for Marcel Utz: ORCID iD orcid.org/0000-0003-2274-9672

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Date deposited: 06 Jun 2016 13:13
Last modified: 26 Nov 2019 01:36

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