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Sample patterning on NMR surface microcoils.

K Ehrmann1, M Gersbach, P Pascoal

  • 1Institute of Microsystems, EPFL-Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland. klaus.ehrmann@epfl.ch

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|October 22, 2005
PubMed
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Sample patterning on planar NMR microprobes improves spin excitation uniformity for cell analysis. This technique enhances sensitivity and data accuracy in microscale nuclear magnetic resonance (NMR) studies.

Area of Science:

  • Biophysical Chemistry
  • Analytical Chemistry
  • Microfluidics

Background:

  • Planar NMR microprobes offer high sensitivity for analyzing small sample volumes.
  • Achieving uniform spin excitation is crucial for accurate NMR measurements, especially in microscale applications.
  • Current methods for sample handling can lead to non-uniform excitation, limiting probe performance.

Purpose of the Study:

  • To develop and demonstrate a method for patterning samples on planar NMR microprobes.
  • To investigate the impact of sample patterning on spin excitation uniformity.
  • To enhance the performance of NMR microprobes for cell analysis applications.

Main Methods:

  • Aligned microcontact printing was used to immobilize lipid vesicles on the NMR microprobe surface.

Related Experiment Videos

  • Lipid vesicles served as cell mimics, containing precisely controlled sucrose solutions.
  • 1H NMR spectra and CPMG spin echoes were recorded for patterned and unpatterned samples.

    • Main Results:

    • Sample patterning significantly improved spin excitation uniformity, as evidenced by nutation curves.
    • Successful recording of NMR spectra and spin echoes from sucrose solutions confined within lipid vesicles.
    • A theoretical model based on 3D finite element simulation was used to determine detection volumes and predict performance.

    Conclusions:

    • Aligned microcontact printing is an effective technique for patterning samples on NMR microprobes.
    • Sample patterning leads to a drastic improvement in spin excitation uniformity.
    • This approach enhances the utility of NMR microprobes for sensitive cell analysis and microscale studies.