Magnetic Resonance in Chemistry最新文献

{"title":"","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":18142,"journal":{"name":"Magnetic Resonance in Chemistry","volume":"64 5","pages":"477-480"},"PeriodicalIF":1.4,"publicationDate":"2026-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148115896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":18142,"journal":{"name":"Magnetic Resonance in Chemistry","volume":"64 5","pages":"477-480"},"PeriodicalIF":1.4,"publicationDate":"2026-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148086525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":18142,"journal":{"name":"Magnetic Resonance in Chemistry","volume":"64 5","pages":"456-476"},"PeriodicalIF":1.4,"publicationDate":"2026-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148071716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":18142,"journal":{"name":"Magnetic Resonance in Chemistry","volume":"64 5","pages":"456-476"},"PeriodicalIF":1.4,"publicationDate":"2026-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148106043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Rapid and Sensitive Method for the Determination of Chitosan Concentration by NMR Relaxometry","authors":"Marta Férová,&nbsp;Jiří Kalina","doi":"10.1002/mrc.70068","DOIUrl":"10.1002/mrc.70068","url":null,"abstract":"<p>A rapid, reagent-free method for the quantification of chitosan in aqueous solutions was developed using ¹H nuclear magnetic resonance (NMR) relaxometry. Transverse relaxation times (T₂) of chitosan solutions (5–1000 mg/L) were measured with a Carr–Purcell–Meiboom–Gill (CPMG) sequence on a benchtop NMR relaxometer. The data were processed using three approaches: monoexponential fitting (Bruker software), inverse Laplace transformation (CONTIN), and one-component curve fitting (Excel Solver). Calibration curves derived from these models demonstrated high linearity and reproducibility, particularly when concentration intervals were segmented. Among the approaches, the most robust correlation was achieved by plotting the absolute area (AA) of the T₂ distribution obtained from CONTIN analysis versus chitosan concentration, yielding <i>R</i>² values of up to 0.9978 for 5–100 mg/L. Comparative analysis at 40°C and 21°C confirmed the method's temperature stability, with improved sensitivity at elevated temperature. Unlike conventional spectrophotometric or chromatographic methods, the proposed protocol requires no chemical derivatization or complex sample preparation. This technique provides a fast, accurate, and non-destructive alternative for chitosan quantification, especially suitable for material science applications where precise concentration monitoring is critical, such as surface modification of nanomaterials.</p>","PeriodicalId":18142,"journal":{"name":"Magnetic Resonance in Chemistry","volume":"64 3","pages":"257-264"},"PeriodicalIF":1.4,"publicationDate":"2026-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12867589/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145661598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterization of Ultrasmall Superparamagnetic Iron Oxide via Fast Field-Cycling NMR Relaxometry at Two Temperatures","authors":"Lyns Verel Che Dji,&nbsp;Thomas Girardet,&nbsp;Solenne Fleutot,&nbsp;Sabine Bouguet-Bonnet","doi":"10.1002/mrc.70070","DOIUrl":"10.1002/mrc.70070","url":null,"abstract":"<div>\u0000 \u0000 <p>We report the nuclear magnetic resonance dispersion (NMRD) profile of superparamagnetic iron oxide nanoparticles (SPIONs) and compare the values obtained from its analysis with those from standard methods. Recorded at ¹H Larmor frequencies from 10 kHz to 600 MHz (0.23 mT to 14.1 T, static magnetic field), this profile covers water ¹H dynamics across a broad timescale encompassing all medically relevant magnetic field strengths in magnetic resonance imaging (MRI). This extensive coverage enables the extraction of accurate physicochemical parameters of the nanoparticles that dictate their efficiency (relaxivity). To support this approach, other conventional characterization methods, including TEM, DLS/zeta potential, and VSM, were employed and compared with the NMRD findings. To ensure robustness, the NMRD profiles were recorded at both 25°C and 37°C. Analysis of NMRD profiles, in conjunction with the appropriate theoretical model, successfully characterized SPIONs, yielding coherent parameters that compare favorably with those from conventional characterization methods.</p>\u0000 </div>","PeriodicalId":18142,"journal":{"name":"Magnetic Resonance in Chemistry","volume":"64 3","pages":"312-318"},"PeriodicalIF":1.4,"publicationDate":"2026-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145743104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":18142,"journal":{"name":"Magnetic Resonance in Chemistry","volume":"64 3","pages":"253-256"},"PeriodicalIF":1.4,"publicationDate":"2026-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148063602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structure Elucidation and NMR Spectral Assignments of Two New Isocoumarins Isolated From the Marine-Derived Fungus Penicillium sp.","authors":"Qian Chen,&nbsp;Wei Zhang,&nbsp;Yicheng Yang","doi":"10.1002/mrc.70069","DOIUrl":"10.1002/mrc.70069","url":null,"abstract":"<div>\u0000 \u0000 <p>In our study, chemical investigation of the marine fungus <i>Penicillium</i> sp. led to the isolation of four isocoumarin derivatives, including two new compounds (<b>1</b> and <b>2</b>) and two known analogues (<b>3</b> and <b>4</b>). The structures of <b>1</b> and <b>2</b> were determined by comprehensive analysis of the 1D (¹H and ¹³C NMR spectra) and 2D NMR data (COSY, HSQC, HMBC, and NOESY spectra). The structure of <b>1</b> was confirmed by comparing the calculated and experimental ¹³C NMR data. Compounds <b>1</b> and <b>2</b> are isocoumarins that lack substitution at the C-5, C-6, and C-7 positions, a structural feature that is uncommon among this class of natural products. The current study enriched the chemical diversity of fungus-derived isocoumarin derivatives.</p>\u0000 </div>","PeriodicalId":18142,"journal":{"name":"Magnetic Resonance in Chemistry","volume":"64 3","pages":"319-323"},"PeriodicalIF":1.4,"publicationDate":"2026-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145763124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"NMR Investigations of Honey: Chemical Composition, Chemical Physical Properties and Molecular Dynamics","authors":"Anton Gradišek,&nbsp;Anne-Laure Rollet,&nbsp;Serap Namli,&nbsp;Mario Cifelli,&nbsp;Bekir Gökçen Mazı,&nbsp;Mecit Halil Öztop,&nbsp;Pedro J. Sebastiao,&nbsp;Valentina Domenici","doi":"10.1002/mrc.70074","DOIUrl":"10.1002/mrc.70074","url":null,"abstract":"<div>\u0000 \u0000 <p>Honey is the best known and a widely used bee product, as well as one of the most defrauded foods. This paper focuses on the analysis of honey by different NMR techniques, complemented by some conventional methods to characterize food. Twenty-six honey samples of different botanical and geographical origins have been investigated. The chemical composition of honey samples in terms of water content and sugar concentrations was determined, and high-resolution ¹H NMR spectroscopy was used to identify, and in some cases to quantify, some of the minor chemical compounds considered important to discriminate the botanical origin of honey. Finally, we developed a model for molecular dynamics in honey, which was tested to analyse the ¹H NMR relaxation dispersions as studied by fast field-cycling NMR relaxometry. In conclusion, an array of NMR techniques, ranging from high to low resolution, was applied to a broad set of honey samples from diverse botanical and geographical origins. The outcomes provide a foundation for future research and potential applications in honey authentication and characterization.</p>\u0000 </div>","PeriodicalId":18142,"journal":{"name":"Magnetic Resonance in Chemistry","volume":"64 3","pages":"333-348"},"PeriodicalIF":1.4,"publicationDate":"2026-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145844106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dose-Dependent Effects of Biochar on Soil Revealed by Fast Field-Cycling (FFC) NMR: From Molecular Water Dynamics to Soil Functionality","authors":"Calogero Librici,&nbsp;Paola Bambina,&nbsp;Ettore Madonia,&nbsp;Veronica Ciaramitaro,&nbsp;Delia Francesca Chillura Martino,&nbsp;Paolo Lo Meo,&nbsp;Pellegrino Conte","doi":"10.1002/mrc.70077","DOIUrl":"10.1002/mrc.70077","url":null,"abstract":"<p>Biochar is a multifunctional soil amendment that improves soil structure, enhances water-holding capacity, and contributes to carbon sequestration. However, the dose–response relationship between biochar addition and soil behavior remains underexplored, particularly at high application rates. In this study, fifteen soil–biochar mixtures were prepared with biochar mass fractions from 0 to 1 (<i>f</i>_BC = 0–1) to evaluate in detail the changes induced in a Sicilian clay soil. The mixtures were investigated for pH, electrical conductivity, bulk density, water-holding capacity, and water activity (Aw). Biochar addition caused pronounced increases in alkalinity, porosity, and water retention, following nonlinear dose–response trends with clear thresholds beyond <i>f</i>_BC ≈ 0.3–0.5. FT-IR spectroscopy revealed the progressive appearance of oxygenated and aromatic functional groups, accompanied by a reduction in signals from adsorbed water and native soil polar groups. Fast Field-Cycling NMR relaxometry provided molecular-scale insight into soil–water interactions. At high biochar contents, water proton <i>T</i>₁ relaxation times were markedly lengthened, indicating a reduced overall efficiency of surface-driven relaxation. Correlation-time (<i>τ</i>_c) analysis further revealed the emergence of water populations with longer correlation times and a redistribution of relaxation pathways toward outer-sphere dominated mechanisms. Overall, the results indicate that biochar improves soil water retention not by strong surface adsorption but through effective pore-space storage, keeping water available for biological use. The combined spectroscopic and relaxometric approach establishes a direct link between molecular-level water dynamics and macroscopic soil properties, highlighting the value of FFC-NMR as a powerful tool for studying natural porous systems.</p>","PeriodicalId":18142,"journal":{"name":"Magnetic Resonance in Chemistry","volume":"64 3","pages":"349-364"},"PeriodicalIF":1.4,"publicationDate":"2026-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12867593/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145863236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}