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Related Concept Videos

¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...

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Related Experiment Video

Updated: May 18, 2026

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements
08:50

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Published on: May 12, 2023

Single bead detection with an NMR microcapillary probe.

Yoshihiro Nakashima1, Michael Boss, Stephen E Russek

  • 1National Institute of Standards and Technology, Boulder, CO 80305, USA. yoshihiro.nakashima@nist.gov

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|October 9, 2012
PubMed
Summary
This summary is machine-generated.

We developed a nuclear magnetic resonance (NMR) microcapillary probe for detecting single magnetic microbeads. This high-resolution probe offers a 600-fold improvement in volume resolution for sensitive magnetic bead detection.

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Last Updated: May 18, 2026

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Area of Science:

  • Biophysics
  • Analytical Chemistry
  • Materials Science

Background:

  • Conventional nuclear magnetic resonance (NMR) probes lack the sensitivity and resolution for detecting single magnetic microbeads.
  • Microscale detection is crucial for various applications, including biological assays and materials characterization.

Purpose of the Study:

  • To develop and optimize a microcapillary NMR probe for the sensitive detection of individual magnetic microbeads.
  • To achieve significant improvements in volume resolution and signal-to-noise ratio (SNR) for microscale NMR detection.

Main Methods:

  • Designed and optimized RF probe geometry for uniform RF field and balanced water signal.
  • Tested three RF probes in a 7 T pulsed NMR spectrometer with sample volumes down to 1 nL.
  • Developed simulations incorporating B(0) shift, coil inhomogeneity, local sensitivity, skin effect, and proximity effects.

Main Results:

  • Achieved a 600-fold improvement in volume resolution compared to conventional NMR probes.
  • The 1 nL probe demonstrated a single-shot SNR of 27 for pure water.
  • Successfully detected a 1 μm magnetic bead with an estimated experimental SNR of 30.

Conclusions:

  • The developed microcapillary NMR probe enables highly sensitive detection of single magnetic microbeads.
  • This technology offers a significant advancement in microscale analytical capabilities for various scientific fields.
  • Optimized probe design and advanced simulations are key to achieving high-resolution micro-NMR detection.