Screening of “spice” herbal mixtures: From high-field to low-field proton NMR

Assemat, Gaëtan; Dubocq, Florian; Balayssac, Stéphane; Lamoureux, Catherine; Malet‐Martino, Myriam; Gilard, Véronique

doi:10.1016/j.forsciint.2017.08.006

Cited by 34 publications

(23 citation statements)

References 22 publications

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“…In these cases, the benchtop NMR spectra of drugs are most often compared with the related high-field NMR spectra in a library, as high-field NMR spectroscopy has been extensively applied in forensic drug analysis, especially to characterize addictive, toxic, fraud, and fake drugs [35,36]. Furthermore, studies have been conducted on the screening of various drugs such as smokable herbal mixtures (known to have the same effects as cannabis) [37] and derivatives of morphine, amphetamine, and ketamine [38]. For some drugs, component quantitation was performed through quantitative NMR (qNMR) spectroscopy using appropriate internal standards (Figure 2) [39], and the results were compared with those of HPLC to confirm the appropriateness of the qNMR technique.…”

Section: Pharmaceuticals and Drugsmentioning

confidence: 99%

Recent Applications of Benchtop Nuclear Magnetic Resonance Spectroscopy

Myoung

Ahn

2021

Magnetochemistry

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Benchtop nuclear magnetic resonance (NMR) spectroscopy uses small permanent magnets to generate magnetic fields and therefore offers the advantages of operational simplicity and reasonable cost, presenting a viable alternative to high-field NMR spectroscopy. In particular, the use of benchtop NMR spectroscopy for rapid in-field analysis, e.g., for quality control or forensic science purposes, has attracted considerable attention. As benchtop NMR spectrometers are sufficiently compact to be operated in a fume hood, they can be efficiently used for real-time reaction and process monitoring. This review introduces the recent applications of benchtop NMR spectroscopy in diverse fields, including food science, pharmaceuticals, process and reaction monitoring, metabolomics, and polymer materials.

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Section: Pharmaceuticals and Drugsmentioning

confidence: 99%

Recent Applications of Benchtop Nuclear Magnetic Resonance Spectroscopy

Myoung

Ahn

2021

Magnetochemistry

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“…Smokable herbal mixtures sold as “incense” may contain one or more synthetic cannabinoids. LF‐NMR has been applied as a qualitative pre‐screening method to rapidly identify nine cannabinoids 36 . Reference spectra were recorded.…”

Section: Lf‐nmr Applicationsmentioning

confidence: 99%

“…However, if more compounds are present, the identification becomes cumbersome due to many matrix compounds, spectral overlap and lower concentrations. Confirmation and quantitation after initial screening by LF‐NMR is possible by HF‐NMR and MS 36 …”

Section: Lf‐nmr Applicationsmentioning

confidence: 99%

Low‐field benchtop NMR spectroscopy: status and prospects in natural product analysis^†

Beek

2020

Phytochemical Analysis

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Introduction Since a couple of years, low‐field (LF) nuclear magnetic resonance (NMR) spectrometers (40–100 MHz) have re‐entered the market. They are used for various purposes including analyses of natural products. Similar to high‐field instruments (300–1200 MHz), modern LF instruments can measure multiple nuclei and record two‐dimensional (2D) NMR spectra. Objective To review the commercial availability as well as applications, advantages, limitations, and prospects of LF‐NMR spectrometers for the purpose of natural products analysis. Method Commercial LF instruments were compared. A literature search was performed for articles using and discussing modern LF‐NMR. Next, the articles relevant to natural products were read and summarised. Results Seventy articles were reviewed. Most appeared in 2018 and 2019. Low costs and ease of operation are most often mentioned as reasons for using LF‐NMR. Conclusion As the spectral resolution of LF instruments is limited, they are not used for structure elucidation of new natural products but rather applied for quality control (QC), forensics, food and health research, process control and teaching. Chemometric data handling is valuable. LF‐NMR is a rapidly developing niche and new instruments keep being introduced.

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“…However, it is difficult to obtain reference standards for all target NPS owing to their rapidly changing structures; hence, this issue should be urgently addressed to allow their detection. In this context, quantitative nuclear magnetic resonance (qNMR) spectroscopy can be used for quantitative analysis through the application of a suitable and readily available internal standard, which is independent of the target component structure [12][13][14] . For example, Ameline et al 15 quantitated seven small bags of NPS using the qNMR method with maleic acid as an internal standard; purities in the range 51-89 % were obtained.…”

Section: Introductionmentioning

confidence: 99%

Quantification of Cathinone Analogues without Reference Standard Using 1H Quantitative NMR

Zhao

Hua

et al. 2021

ANAL. SCI.

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Synthetic cathinones are a type of new psychoactive substances (NPS) that have been seriously abused. Owing to the rapid variation in their structures, the absence of reference standards poses a challenge in quantitative investigations. In this study, a 1 H quantitative nuclear magnetic resonance ( 1 H qNMR) method was established using maleic acid as the internal standard and the shared signal (i.e., the methylidyne hydrogen) on the parent synthetic cathinones structure as the quantitative peak. Taking 3-methoxy-2-(methylamino)-1-(4-methylphenyl)propan-1-one (mexedrone) as an example, this study optimized the acquisition parameters and conducted method validation, including evaluation of the specificity, linearity, accuracy, precision, and robustness. Using this 1 H qNMR method, the contents of mexedrone and its analogues,-dinopropiophenone (4-Cl-α-PVP), 1-(3, 4-methylenedioxy -phenyl)-2-propylamino-pro -pan-1-one (propylone), and methcathinone, were obtained. The obtained results showed that the method was accurate, rapid, versatile, and can be used to address the qualitative and quantitative issues related to similar substances.

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Screening of “spice” herbal mixtures: From high-field to low-field proton NMR

Cited by 34 publications

References 22 publications

Recent Applications of Benchtop Nuclear Magnetic Resonance Spectroscopy

Recent Applications of Benchtop Nuclear Magnetic Resonance Spectroscopy

Low‐field benchtop NMR spectroscopy: status and prospects in natural product analysis^†

Quantification of Cathinone Analogues without Reference Standard Using 1H Quantitative NMR

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Screening of “spice” herbal mixtures: From high-field to low-field proton NMR

Cited by 34 publications

References 22 publications

Recent Applications of Benchtop Nuclear Magnetic Resonance Spectroscopy

Recent Applications of Benchtop Nuclear Magnetic Resonance Spectroscopy

Low‐field benchtop NMR spectroscopy: status and prospects in natural product analysis†

Quantification of Cathinone Analogues without Reference Standard Using 1H Quantitative NMR

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Product

Resources

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Low‐field benchtop NMR spectroscopy: status and prospects in natural product analysis^†