Thomas Castaing-Cordier, Sélina Crasnier, Damien Dubois, Virginie Ladroue, Audrey Buleté, Cédric Prudhomme, Céline Charvoz, Fabrice Besacier, Denis Jacquemin, Patrick Giraudeau, Jonathan Farjon
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引用次数: 0
摘要
需要有效和稳健的分析方法来改进新精神活性物质(NPS)的识别和后续监管。核磁共振波谱是一种独特的方法,能够确定小分子的结构,如NPS,甚至在混合物中。然而,高场核磁共振分析与昂贵的购买和维护成本相关。十多年来,紧凑型核磁共振光谱仪改变了这种模式。最近的研究表明,结合紧凑核磁共振和数据库的专用分析工作流程可以识别NPS的分子结构,尽管紧凑光谱仪的光谱色散和灵敏度较低。该方法依靠1 H-13 C HSQC来识别NPS和阐明未知物质的结构。然而,由于需要在分辨率和实验时间之间折衷,它的性能受到限制。在这里,我们表明,通过实施非均匀采样(NUS)可以显著改进该策略,以提高HSQC在13 C维度的光谱分辨率,而不需要花费实验时间。对于纯NPS和混合物,分辨率增益在3到4之间。最后,利用基于NUS的二维HSQC技术,在数据库的辅助下提高对NPS的识别。由此产生的方法似乎是表征混合物中NPS的有用工具,这对法医实验室至关重要。
Non-uniform sampling to enhance the performance of compact NMR for characterizing new psychoactive substances
Efficient and robust analytical methods are needed to improve the identification and subsequent regulation of new psychoactive substances (NPS). NMR spectroscopy is a unique method able to determine the structure of small molecules such as NPS even in mixtures. However, high-field NMR analysis is associated with expensive purchase and maintenance costs. For more than a decade, compact NMR spectrometers have changed this paradigm. It was recently shown that a dedicated analytical workflow combining compact NMR and databases could identify the molecular structure of NPS, in spite of the lower spectral dispersion and sensitivity of compact spectrometers. This approach relies on 1H-13C HSQC to both recognize NPS and elucidate the structure of unknown substances. Still, its performance is limited by the need to compromise between resolution and experiment time. Here, we show that this strategy can be significantly improved by implementing non-uniform sampling (NUS) to improve spectral resolution in the 13C dimension of HSQC at no cost in terms of experiment time. Gains in the range of 3 to 4 in resolution are achieved for pure NPS and for a mixture. Finally, 2D HSQC with NUS was applied to improve the identification of NPS with the assistance of databases. The resulting method appears as a useful tool for the characterization of NPS in mixtures, which is essential for forensic laboratories.
期刊介绍:
MRC is devoted to the rapid publication of papers which are concerned with the development of magnetic resonance techniques, or in which the application of such techniques plays a pivotal part. Contributions from scientists working in all areas of NMR, ESR and NQR are invited, and papers describing applications in all branches of chemistry, structural biology and materials chemistry are published.
The journal is of particular interest not only to scientists working in academic research, but also those working in commercial organisations who need to keep up-to-date with the latest practical applications of magnetic resonance techniques.