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Low-Cost Purpose-Built Ultra-Low-Field NMR Spectrometer

https://doi.org/10.1021/acs.analchem.4c03149

Chowdhury, Md_Raduanul H; Ahmed, Firoz; Oladun, Clementinah; Adelabu, Isaiah; Abdurraheem, Abubakar; Nantogma, Shiraz; Birchall, Jonathan R; Gafar, Tobi Abdulbasit; Chekmenev, Yuri A; Nikolaou, Panayiotis; et al (October 2024, Analytical Chemistry)

Free, publicly-accessible full text available October 8, 2025
Carbon-13 Radiofrequency Amplification by Stimulated Emission of Radiation of the Hyperpolarized Ketone and Hemiketal Forms of Allyl [1- ¹³ C]Pyruvate

https://doi.org/10.1021/acssensors.3c02075

Nantogma, Shiraz; de_Maissin, Henri; Adelabu, Isaiah; Abdurraheem, Abubakar; Nelson, Christopher; Chukanov, Nikita V; Salnikov, Oleg G; Koptyug, Igor V; Lehmkuhl, Sören; Schmidt, Andreas B; et al (February 2024, ACS Sensors)

Full Text Available
¹³ C Radiofrequency Amplification by Stimulated Emission of Radiation Threshold Sensing of Chemical Reactions

https://doi.org/10.1021/jacs.3c00776

Schmidt, Andreas B.; Adelabu, Isaiah; Nelson, Christopher; Nantogma, Shiraz; Kiselev, Valerij G.; Zaitsev, Maxim; Abdurraheem, Abubakar; de Maissin, Henri; Rosen, Matthew S.; Lehmkuhl, Sören; et al (May 2023, Journal of the American Chemical Society)

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Parahydrogen‐Induced Carbon‐13 Radiofrequency Amplification by Stimulated Emission of Radiation

https://doi.org/10.1002/anie.202215678

Nelson, Christopher; Schmidt, Andreas B.; Adelabu, Isaiah; Nantogma, Shiraz; Kiselev, Valerij G.; Abdurraheem, Abubakar; de Maissin, Henri; Lehmkuhl, Sören; Appelt, Stephan; Theis, Thomas; et al (December 2022, Angewandte Chemie International Edition)

Abstract The feasibility of Carbon‐13 Radiofrequency (RF) Amplification by Stimulated Emission of Radiation (C‐13 RASER) is demonstrated on a bolus of liquid hyperpolarized ethyl [1‐¹³C]acetate. Hyperpolarized ethyl [1‐¹³C]acetate was prepared via pairwise addition of parahydrogen to vinyl [1‐¹³C]acetate and polarization transfer from nascent parahydrogen‐derived protons to the carbon‐13 nucleus via magnetic field cycling yielding C‐13 nuclear spin polarization of approximately 6 %. RASER signals were detected from samples with concentration ranging from 0.12 to 1 M concentration using a non‐cryogenic 1.4T NMR spectrometer equipped with a radio‐frequency detection coil with a quality factor (Q) of 32 without any modifications. C‐13 RASER signals were observed for several minutes on a single bolus of hyperpolarized substrate to achieve 21 mHz NMR linewidths. The feasibility of creating long‐lasting C‐13 RASER on biomolecular carriers opens a wide range of new opportunities for the rapidly expanding field of C‐13 magnetic resonance hyperpolarization.
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