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Quo Vadis qNMR?
Diehl B, Holzgrabe U, Monakhova Y, Schönberger T. Diehl B, et al. J Pharm Biomed Anal. 2020 Jan 5;177:112847. doi: 10.1016/j.jpba.2019.112847. Epub 2019 Aug 30. J Pharm Biomed Anal. 2020. PMID: 31505431 Review.
All these methods contribute to the platform of qNMR methods and extend the possibilities of NMR for quantification and quality evaluation of drugs, excipients, polymers, and plant extracts. ...
All these methods contribute to the platform of qNMR methods and extend the possibilities of NMR for quantification and quality evalu …
Direct Comparison of (19)F qNMR and (1)H qNMR by Characterizing Atorvastatin Calcium Content.
Liu Y, Liu Z, Yang H, He L. Liu Y, et al. J Anal Methods Chem. 2016;2016:7627823. doi: 10.1155/2016/7627823. Epub 2016 Sep 1. J Anal Methods Chem. 2016. PMID: 27688925 Free PMC article.
Most of the reports were based on proton qNMR ((1)H qNMR) and only a few fluorine qNMR ((19)F qNMR) were reported. No research has been conducted to directly compare the advantage and disadvantage between these two methods. ...Results showed that (19)F …
Most of the reports were based on proton qNMR ((1)H qNMR) and only a few fluorine qNMR ((19)F qNMR) were reporte …
[Ensuring Traceability Using qNMR in the Quantitative Analysis of Formaldehyde and Acetaldehyde].
Tahara M, Sugimoto N, Tanaka-Kagawa T, Sakai S, Ikarashi Y, Jinno H. Tahara M, et al. Yakugaku Zasshi. 2018;138(4):551-557. doi: 10.1248/yakushi.17-00210. Yakugaku Zasshi. 2018. PMID: 29608005 Free article. Japanese.
Although the commercial DNPH derivatives of formaldehyde and acetaldehyde were low concentration solutions, we were able to determine their purities using (1)H-qNMR. ...In conclusion, it is possible to obtain highly accurate results using (1)H-qNMR with commercially …
Although the commercial DNPH derivatives of formaldehyde and acetaldehyde were low concentration solutions, we were able to determine their …
qNMR for profiling the production of fungal secondary metabolites.
Brooks WC, Paguigan ND, Raja HA, Moy FJ, Cech NB, Pearce CJ, Oberlies NH. Brooks WC, et al. Magn Reson Chem. 2017 Jul;55(7):670-676. doi: 10.1002/mrc.4571. Epub 2017 Feb 5. Magn Reson Chem. 2017. PMID: 28024162 Free PMC article.
Facilitating the performance of qNMR analysis using automated quantification and results verification.
Monakhova YB, Diehl BWK. Monakhova YB, et al. Magn Reson Chem. 2017 Sep;55(9):813-820. doi: 10.1002/mrc.4591. Epub 2017 Mar 28. Magn Reson Chem. 2017. PMID: 28295588
Quantitative nuclear magnetic resonance (qNMR) is considered as a powerful tool for measuring the absolute amount of small molecules in complex mixtures. ...In general, the usage of the developed script can facilitate and verify results of routine qNMR analysis in a …
Quantitative nuclear magnetic resonance (qNMR) is considered as a powerful tool for measuring the absolute amount of small molecules …
Two-dimensional qNMR of anthraquinones in Frangula alnus (Rhamnus frangula) using surrogate standards and delay time adaption.
Çiçek SS, Ugolini T, Girreser U. Çiçek SS, et al. Anal Chim Acta. 2019 Nov 12;1081:131-137. doi: 10.1016/j.aca.2019.06.046. Epub 2019 Jun 25. Anal Chim Acta. 2019. PMID: 31446950
In the absence of adequate reference material, a problem often encountered in natural product chemistry, we investigated the use of surrogate standards in two-dimensional qNMR for the quantification of anthraquinones in the bark of alder buckthorn (Frangula alnus). ...
In the absence of adequate reference material, a problem often encountered in natural product chemistry, we investigated the use of surrogat …
Use of (13)C-qNMR Spectroscopy for the Analysis of Non-Psychoactive Cannabinoids in Fibre-Type Cannabis sativa L. (Hemp).
Marchetti L, Brighenti V, Rossi MC, Sperlea J, Pellati F, Bertelli D. Marchetti L, et al. Molecules. 2019 Mar 22;24(6):1138. doi: 10.3390/molecules24061138. Molecules. 2019. PMID: 30909372 Free PMC article.
In this context, the present study was aimed at the multi-component analysis and determination of the main non-psychoactive cannabinoids (cannabidiol, cannabidiolic acid, cannabigerol and cannabigerolic acid) in female inflorescences of different hemp varieties by means of (13)C …
In this context, the present study was aimed at the multi-component analysis and determination of the main non-psychoactive cannabinoids (ca …
A validated (1)H qNMR method for direct and simultaneous quantification of esculin, fraxin and (-)-epicatechin in Hippocastani cortex.
Owczarek A, Kłys A, Olszewska MA. Owczarek A, et al. Talanta. 2019 Jan 15;192:263-269. doi: 10.1016/j.talanta.2018.09.036. Epub 2018 Sep 15. Talanta. 2019. PMID: 30348388
A fast and precise qNMR method was developed for quantification of major bioactive constituents in the bark of horse chestnut and dry extracts prepared thereof. ...The obtained results were cross-validated by a HPLC-PDA method with the use of a fused-core column, and no st …
A fast and precise qNMR method was developed for quantification of major bioactive constituents in the bark of horse chestnut and dry …
Method development in quantitative NMR towards metrologically traceable organic certified reference materials used as (31)P qNMR standards.
Weber M, Hellriegel C, Rueck A, Wuethrich J, Jenks P, Obkircher M. Weber M, et al. Anal Bioanal Chem. 2015 Apr;407(11):3115-23. doi: 10.1007/s00216-014-8306-6. Epub 2014 Nov 22. Anal Bioanal Chem. 2015. PMID: 25416230 Free PMC article.
Although qNMR reference standards are already available as certified reference materials (CRM) providing traceability on the basis of (1)H qNMR experiments, there is an increasing demand for purity assays on phosphorylated organic compounds and metabolites requiring …
Although qNMR reference standards are already available as certified reference materials (CRM) providing traceability on the basis of …
Practical guide for selection of (1) H qNMR acquisition and processing parameters confirmed by automated spectra evaluation.
Monakhova YB, Diehl BWK. Monakhova YB, et al. Magn Reson Chem. 2017 Nov;55(11):996-1005. doi: 10.1002/mrc.4622. Epub 2017 Jun 20. Magn Reson Chem. 2017. PMID: 28561374
In our recent paper, a new technique for automated spectra integration and quality control of the acquired results in qNMR was developed and validated (Monakhova & Diehl, Magn. ...Lite Gaussian window multiplication resulted in accuracy improvement of the qNMR o …
In our recent paper, a new technique for automated spectra integration and quality control of the acquired results in qNMR was develo …
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