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Low-Cost Purpose-Built Ultra-Low-Field NMR Spectrometer
Md Raduanul H Chowdhury1, Firoz Ahmed1, Clementinah Oladun1
1Department of Chemistry, Integrative Biosciences (Ibio), Wayne State University, Karmanos Cancer Institute (KCI), Detroit, Michigan 48202, United States.
We developed a compact, low-cost NMR spectrometer for hyperpolarized contrast media polarimetry. This device enables reproducible quantification of polarization and dynamics, offering a versatile tool for advanced research.
Area of Science:
- Analytical Chemistry
- Spectroscopy
- Biophysics
Background:
- Nuclear Magnetic Resonance (NMR) spectroscopy is crucial for analyzing molecular structure and dynamics.
- Low-field NMR offers a novel approach for these investigations.
- Hyperpolarized contrast agents enhance NMR signal sensitivity for medical imaging and research.
Purpose of the Study:
- To introduce a highly integrated, ultralow-frequency NMR spectrometer.
- To enable ultralow-field NMR polarimetry of hyperpolarized contrast media.
- To provide a cost-effective and portable solution for NMR applications.
Main Methods:
- Designed and constructed a compact (10 cm × 10 cm × 2.0 cm, 370 g) NMR spectrometer.
- Integrated all components, including RF amplifier, within an aluminum enclosure.
- Utilized a pulse-wait-acquire-recover pulse sequence controlled via a GUI or RS485 communication.
- Employed a 17-bit ADC for data acquisition in the 1-125 kHz range.
Main Results:
- Demonstrated utility for NMR polarimetry of hyperpolarized 129Xe gas and [1-13C]pyruvate.
- Achieved reproducible quantification of polarization values and relaxation dynamics.
- Obtained results comparable to established benchtop 13C NMR spectroscopy.
- Component cost is approximately $200, highlighting its low-cost nature.
Conclusions:
- The developed NMR spectrometer is a highly integrated, portable, and cost-effective device.
- It enables plug-and-play NMR polarimetry for hyperpolarized contrast media.
- Offers a versatile platform for various applications in contrast media production and beyond.
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