Journal of Magnetic Resonance Open最新文献

{"title":"Long-term water migration in hydrated corn stalk pith and hemp stalk by 250 MHz NMR relaxometry and diffusometry","authors":"Matthew C. Young ,&nbsp;Sarah L. Codd ,&nbsp;Joseph D. Seymour","doi":"10.1016/j.jmro.2025.100210","DOIUrl":"10.1016/j.jmro.2025.100210","url":null,"abstract":"<div><div>Plant fibers are of current interest in biocomposites and known hydrophilicity of plant fibers, e.g. corn stalk pith and hemp stalk, require enhanced understanding of water impacts on fiber structure. Water distribution during hydration in these fibers is compared to fibrous cellulose media using nuclear magnetic resonance (NMR) <span><math><msub><mrow><mi>T</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> relaxometry and diffusometry. Measurements were made every 6 h from <span><math><mrow><mn>3</mn><mtext>–</mtext><mn>237</mn></mrow></math></span> h, or until equilibrium. NMR <span><math><msub><mrow><mi>T</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> measured bound, intermediate bound and macropore water populations at two water mass hydrations. NMR diffusometry measured diffusion coefficients <span><math><mi>D</mi></math></span> of mobile water populations in each material. The diffusion coefficient <span><math><mi>D</mi></math></span> was acquired as a function of molecular migration time <span><math><mi>Δ</mi></math></span> to detect restricted diffusion. <span><math><mrow><mi>D</mi><mrow><mo>(</mo><mi>Δ</mi><mo>)</mo></mrow></mrow></math></span> behavior indicated increased interpore connectivity in highly saturated hemp, versus swollen pores saturated pith. <span><math><mrow><mi>D</mi><mrow><mo>(</mo><mi>Δ</mi><mo>)</mo></mrow></mrow></math></span> values were fit for surface to volume ratio <span><math><mrow><mi>S</mi><mo>/</mo><mi>V</mi></mrow></math></span> to determine average pore radius <span><math><mi>r</mi></math></span> as a function of hydration. <span><math><mrow><mi>S</mi><mo>/</mo><mi>V</mi></mrow></math></span> values were paired to <span><math><msub><mrow><mi>T</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> distributions to provide an effective average transverse magnetic surface relaxivity <span><math><msub><mrow><mover><mrow><mi>ρ</mi></mrow><mrow><mo>̄</mo></mrow></mover></mrow><mrow><mn>2</mn></mrow></msub></math></span> throughout hydration, which is then used to rescale <span><math><msub><mrow><mi>T</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> distributions as pore size distributions. Bound water was found in pores <span><math><mrow><mo>&lt;</mo><mn>1</mn><mspace></mspace><mi>μ</mi></mrow></math></span>m, semi-bound water in pores from <span><math><mrow><mn>1</mn><mtext>–</mtext><mn>30</mn><mspace></mspace><mi>μ</mi></mrow></math></span>m and macropore water in pores from <span><math><mrow><mn>30</mn><mtext>–</mtext><mn>300</mn><mspace></mspace><mi>μ</mi></mrow></math></span>m, in agreement with prior literature.</div></div>","PeriodicalId":365,"journal":{"name":"Journal of Magnetic Resonance Open","volume":"25 ","pages":"Article 100210"},"PeriodicalIF":2.624,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advanced NMR in contemporary China","authors":"Maili Liu ,&nbsp;Lucio Frydman ,&nbsp;Xueqian Kong ,&nbsp;Conggang Li ,&nbsp;Jun Xu","doi":"10.1016/j.jmro.2025.100209","DOIUrl":"10.1016/j.jmro.2025.100209","url":null,"abstract":"","PeriodicalId":365,"journal":{"name":"Journal of Magnetic Resonance Open","volume":"24 ","pages":"Article 100209"},"PeriodicalIF":2.624,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145007567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efficient 15N hyperpolarization of [15N3]metronidazole antibiotic via spin-relayed pulsed SABRE-SHEATH","authors":"Shiraz Nantogma ,&nbsp;Shannon L. Eriksson ,&nbsp;Thomas Theis ,&nbsp;Warren S. Warren ,&nbsp;Boyd M. Goodson ,&nbsp;Eduard Y. Chekmenev","doi":"10.1016/j.jmro.2025.100208","DOIUrl":"10.1016/j.jmro.2025.100208","url":null,"abstract":"<div><div>Signal Amplification by Reversible Exchange in SHield Enables Alignment Transfer to Heteronuclei (SABRE-SHEATH) is an NMR hyperpolarization technique that relies of the simultaneous exchange of parahydrogen and a to-be-hyperpolarized molecule on the metal center of a polarization-transfer catalyst in a microtesla magnetic field. Until recently, this method has been understood to perform hyperpolarization by establishing level anti-crossings between the nuclear spins of the parahydrogen derived hydrides (acting as a source of hyperpolarization) and those of the substrate. Recently, the application of highly non-intuitive pulse sequences (comprising pulses of microtesla DC fields) was predicted to hyperpolarize nuclear spins more efficiently than the canonical (static-field) SABRE-SHEATH approach. Here we show that by employing a basic “on-off” pulse sequence of rectangular microtesla pulses, it is possible to improve the hyperpolarization efficiency for SABRE-SHEATH of [¹⁵N₃]metronidazole, an FDA-approved antibiotic (in non-enriched and non-hyperpolarized form) and potential hypoxia sensing molecule. Specifically, we demonstrate that ¹⁵N polarization of 18.5 % can be obtained in 80 s of parahydrogen bubbling parahydrogen through a solution containing 20 mM [¹⁵N₃]metronidazole. In practice, (1.32 ± 0.14)-fold improvements in <em>P</em>_15N was obtained with the pulsed method described here compared to static field technique variant. These results show that pulsed SABRE-SHEATH was successfully applied to ¹⁵N-labeled biologically relevant molecule. Moreover, we also demonstrate that although the pulsed SABRE-SHEATH sequence was designed for polarization transfer from parahydrogen derived hydrides to the metronidazole’s ¹⁵N catalyst-binding site, all three ¹⁵N sites of [¹⁵N₃]metronidazole attained the hyperpolarized state. This spin-relayed polarization transfer becomes possible due to the ¹⁵N relay network established by their spin-spin <em>J</em>-couplings. The feasibility of the spin-relayed polarization transfer is demonstrated here for the first time for pulsed SABRE-SHEATH (as opposed to the static-field SABRE-SHEATH reported previously) and it paves the way to broad applicability of the technique.</div></div>","PeriodicalId":365,"journal":{"name":"Journal of Magnetic Resonance Open","volume":"24 ","pages":"Article 100208"},"PeriodicalIF":2.624,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144757909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Continuous-flow electron spin resonance microfluidics device with sub-nanoliter sample volume","authors":"Oleg Zgadzai ,&nbsp;Nir Almog ,&nbsp;Yefim Varshavsky ,&nbsp;Moamen Jbara ,&nbsp;Benoit Driesschaert ,&nbsp;Aharon Blank","doi":"10.1016/j.jmro.2025.100207","DOIUrl":"10.1016/j.jmro.2025.100207","url":null,"abstract":"<div><div>This paper presents a novel continuous-flow electron spin resonance (ESR) microfluidic device designed for both continuous-wave (CW) and pulsed ESR measurements on sub-nanoliter liquid samples. The system integrates a planar surface microresonator (ParPar type) operating at ∼9.4 GHz with a precision-fabricated quartz microfluidic chip, enabling spatial confinement of the sample within the resonator’s microwave magnetic field hotspot while minimizing dielectric losses. The effective sample volume is ∼0.06 nL, and the device supports standard microfluidic connectors, facilitating both continuous and stopped-flow experiments. Using a 1 mM aqueous solution of deuterated Finland trityl (dFT) radical, CW ESR measurements yielded a peak signal-to-noise ratio (SNR) of ∼83 for a 100-point spectrum acquired over 80 s, with a resonator quality factor of Q ∼15–20. This corresponds to a spin sensitivity of ∼1.04 × 10⁹ spins/√Hz/G. Pulsed ESR measurements, performed with 0.1 W microwave power and 10 ns π pulses, achieved an SNR of ∼47 with 1 s of averaging, corresponding to a spin sensitivity of ∼7.8 × 10⁸ spins/√Hz. A Rabi frequency of ∼50 MHz was measured, indicating a microwave conversion efficiency of ∼56 G/√W. Both the pulsed spin sensitivity and Rabi frequency are consistent with simulated values. This device represents a significant step toward ESR-based detection of individual, slowly flowing cells—analogous to flow cytometry but with magnetic resonance contrast. With future enhancements such as higher operating frequencies, cryogenic integration, or optimized resonator geometries, the system is expected to enable practical ESR measurements at the single-cell level.</div></div>","PeriodicalId":365,"journal":{"name":"Journal of Magnetic Resonance Open","volume":"24 ","pages":"Article 100207"},"PeriodicalIF":2.624,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144604406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Magnetic resonance coil prototyping and implementation for multi-nuclear small animal imaging","authors":"Alexander I. Zavriyev ,&nbsp;Benjamin J. Yoon ,&nbsp;John Choi ,&nbsp;Bukola Y. Adebesin ,&nbsp;Paul S. Jacobs ,&nbsp;Gabor Mizsei ,&nbsp;Molly M. Sheehan ,&nbsp;Stephen Kadlecek ,&nbsp;Terence P.F. Gade","doi":"10.1016/j.jmro.2025.100206","DOIUrl":"10.1016/j.jmro.2025.100206","url":null,"abstract":"<div><h3>Purpose</h3><div>Heteronuclear MR imaging allows investigation into unique disease states. These approaches often require radiofrequency coil designs that are customized for the imaging probe and target. This study addresses the challenges of rapidly prototyping heteronuclear MR coils for small animal imaging applications. We propose the use of 3D-printing molds for inductor shaping connected to a printed circuit board (PCB) via a flexible coaxial cabling to enhance coil reproducibility and utility.</div></div><div><h3>Methods</h3><div>A rapid prototyping pipeline was developed for constructing affordable and sensitive coils. The reproducibility of 3D-printed mold inductors was compared to hand-turned and PCB inductors. A theoretical treatment of the effect of PCB/inductor coupling on tuning/matching conditions was verified under a variety of practical conditions, yielding a simplified approach which allows component selection and assembly with minimal empirical development.</div></div><div><h3>Results</h3><div>The 3D-printed mold inductors demonstrated higher reproducibility than hand-turned inductors, and PCB RF coils demonstrated the highest reproducibility. The average resonance return loss (S₁₁) across all 3D-printed mold inductors was -40.2 dB ± 4.8 dB, with an average circuit Q factor of 58 ± 12. The presented model predicts resonance characteristics within 1 % of measured values over a range of frequencies and geometries.</div></div><div><h3>Conclusion</h3><div>The developed prototyping pipeline represents a rapid and effective approach for designing highly reproducible coils with a desired resonance frequency and size that can easily be adapted for a variety of experimental set-ups. All design resources – including an interactive coil-parameter calculator, 3D-models of inductor molds, and PCB files – are available for use at <span><span>https://medcap.ai/mr-coil-calculator</span><svg><path></path></svg></span>.</div></div>","PeriodicalId":365,"journal":{"name":"Journal of Magnetic Resonance Open","volume":"24 ","pages":"Article 100206"},"PeriodicalIF":2.624,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144613919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hyperpolarized [1-¹³C] pyruvate MRSI reveals a diet-dependent metabolic shift in ZSF1 rats","authors":"Karen Dos Santos ,&nbsp;Salva R. Yurista ,&nbsp;Sophia M. Mirrione ,&nbsp;David O. Guarin Bedoya ,&nbsp;Samuel R. Calos ,&nbsp;Ivan Luptak ,&nbsp;Atsushi M. Takahashi ,&nbsp;Wai Hong Wilson Tang ,&nbsp;Yoshiko Iwamoto ,&nbsp;Christopher T. Nguyen ,&nbsp;Yi-Fen Yen","doi":"10.1016/j.jmro.2025.100205","DOIUrl":"10.1016/j.jmro.2025.100205","url":null,"abstract":"<div><div>We evaluated altered cardiac metabolism in Zucker Spontaneously Hypertensive Fatty (ZSF1) rats fed an isocaloric high-fat diet versus normal chow using hyperpolarized (HP) [1-¹³C]pyruvate MR spectroscopic imaging (MRSI). This technique exploits remarkable signal enhancement to track the metabolic fate of injected HP [1-¹³C]pyruvate <em>in vivo</em>, allowing a simultaneous assessment of multiple metabolic pathways. The conversion of [1-¹³C]pyruvate to [1-¹³C]lactate (Lac) reflects anaerobic glycolysis activity, while the detection of ¹³C-bicarbonate (Bic) indicates glucose oxidation<em>.</em> Our findings show that ZSF1 rats fed a high-fat diet exhibit a greater reliance on anaerobic glycolysis relative to glucose oxidation, and this metabolic shift can be detected <em>in vivo</em> in real time. This study demonstrates the feasibility of HP [1-¹³C]pyruvate MRSI for assessing diet-dependent metabolic shifts in the myocardium of ZSF1 obese rats, a widely used preclinical model for heart failure with preserved ejection fraction (HFpEF).</div></div>","PeriodicalId":365,"journal":{"name":"Journal of Magnetic Resonance Open","volume":"24 ","pages":"Article 100205"},"PeriodicalIF":2.624,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144556976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hyperpolarization: From toy to tool, and back to toy","authors":"Guinevere Mathies ,&nbsp;Sami Jannin ,&nbsp;Lucio Frydman","doi":"10.1016/j.jmro.2025.100202","DOIUrl":"10.1016/j.jmro.2025.100202","url":null,"abstract":"","PeriodicalId":365,"journal":{"name":"Journal of Magnetic Resonance Open","volume":"23 ","pages":"Article 100202"},"PeriodicalIF":2.624,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144222964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Avoiding broadband radiation damping effects in NOESY spectra","authors":"Kelsey Anne Marr,&nbsp;Alexej Jerschow","doi":"10.1016/j.jmro.2025.100203","DOIUrl":"10.1016/j.jmro.2025.100203","url":null,"abstract":"<div><div>Radiation damping is a well-known phenomenon in the context of NMR spectroscopy. Several strategies exist for minimizing the effects of radiation damping, which have mostly been focused on limiting the effects of one resonance (frequently the water resonance). When samples with many resonances are examined at high concentration, such approaches often cannot be used. One category of systems where the broadband nature of radiation damping leads to complications are deep eutectic solvents (DESs). DESs are considered innovative solvent systems that have several advantages such as tunability and environmental friendliness, with important applications ranging from catalysis to drug delivery. It is of interest to examine the intermolecular effects via NMR spectroscopy in these systems. Here we show that broadband radiation effects are very strong in these systems and identify simple strategies specifically for 2D NOESY NMR spectroscopy to regain the ability to quantify intermolecular interactions in these systems.</div></div>","PeriodicalId":365,"journal":{"name":"Journal of Magnetic Resonance Open","volume":"23 ","pages":"Article 100203"},"PeriodicalIF":2.624,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144089106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Understanding the correlation between ion transport and side chains in polymer electrolyte","authors":"Ligang Xu ,&nbsp;Yuqi Li ,&nbsp;Yongchao shi ,&nbsp;Yachao Yan ,&nbsp;Wengui Yu ,&nbsp;Huajie Luo ,&nbsp;Jipeng Fu ,&nbsp;Haiyan Zheng ,&nbsp;Mingxue Tang","doi":"10.1016/j.jmro.2025.100200","DOIUrl":"10.1016/j.jmro.2025.100200","url":null,"abstract":"<div><div>The rise of the new energy market has driven the rapid development of solid-state batteries (SSBs). Polymer electrolytes, due to their excellent interfacial compatibility and high safety, have brought new opportunities to SSBs. We report a polymer side-chain design strategy that combines ionic liquids and low-molecular-weight ether-based molecules into a copolymer electrolyte (CPE). Using nuclear magnetic resonance (NMR) techniques, we investigated the spatial distribution of lithium ions (Li⁺) and the correlations between anions of different conformations in the CPE. This study found that the introduced ionic liquids and high-freedom ether groups enable rapid ion migration, resulting in an ion conductivity of 1.44 × 10^–4 S cm^-1 at 25 °C. The dual lithium symmetric battery based on CPE can cycle more than1000 h at a current density of 0.3 mA cm^-2, while the LFP|CPE|Li full battery presents high retention after 120 cycles even at ultra-high loading (12.9 mg cm^-2) and a high current density of 1 C.</div></div>","PeriodicalId":365,"journal":{"name":"Journal of Magnetic Resonance Open","volume":"23 ","pages":"Article 100200"},"PeriodicalIF":2.624,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143860260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Applications of high-field nuclear magnetic resonance (NMR) in chemical research","authors":"Qian Li ,&nbsp;Junfeng Xiang","doi":"10.1016/j.jmro.2025.100199","DOIUrl":"10.1016/j.jmro.2025.100199","url":null,"abstract":"<div><div>With the rapid advancement of NMR magnet and probe technology, high-field NMR spectrometers equipped with high-resolution and high-sensitivity probes will find broader applications in the field of chemical research. The spectral resolution of NMR increases proportionally with the magnetic field strength (B0). Higher magnetic fields of NMR increase the separation between different resonant frequencies of nuclei, leading to better spectral resolution. Besides spectral resolution, the signal-to-noise ratio (SNR) is proportional to the magnetic field strength raised to the power of three-halves. Advancements in probe technology over the past few decades have led to the widespread adoption of probeheads equipped with coils and preamplifiers that are cryogenically cooled by cold helium or nitrogen. This significantly reduces system noise, thereby improving SNR in detection. A series of typical applications of high-field nuclear magnetic resonance (NMR) in chemical research has been introduced. By utilizing the broadband direct observe cryoprobe (DOCP), a wide range of nuclei can be detected with high sensitivity, enabling the efficient characterization of numerous chemical systems at natural abundance, without the need for time-consuming and costly isotope labeling processes. High-field, high-sensitivity, and high-resolution NMR techniques provide promising tools that are likely to play an increasingly important role in future chemical investigations.</div></div>","PeriodicalId":365,"journal":{"name":"Journal of Magnetic Resonance Open","volume":"23 ","pages":"Article 100199"},"PeriodicalIF":2.624,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143851523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}