化学
编码(内存)
扩散
核磁共振波谱
集合(抽象数据类型)
生物系统
光谱学
分子
灵敏度(控制系统)
计算机科学
人工智能
有机化学
热力学
程序设计语言
工程类
物理
生物
量子力学
电子工程
作者
Corentin Jacquemmoz,Rituraj Mishra,Ludmilla Guduff,Carine van Heijenoort,Jean-Nicolas Dumez
摘要
Diffusion-ordered NMR spectroscopy (DOSY NMR) is a widely used method for the analysis of mixtures. It can be used to separate the spectra of a mixture's components and to analyse interactions. The classic implementation of DOSY experiments, based on an incrementation of the diffusion-encoding gradient area, requires several minutes or more to collect a 2D data set. Spatially-encoded (SPEN) DOSY makes it possible to collect a complete data set in less than 1 s, by spatial parallelisation of the effective gradient area. While several short descriptions of SPEN DOSY experiments have been reported, a thorough characterisation of its features and its practical use is missing, and this hinders the use of the method. Here, we present the unusual principles and implementation of the SPEN DOSY experiment, an understanding of which is useful to make optimal use of the method. The encoding and acquisition steps are described, and the parameter relations that govern the setup of SPEN DOSY experiments are discussed. The influence of key parameters, including on sensitivity, is illustrated experimentally on mixtures of small molecules. This study should be useful for the setup of SPEN DOSY experiments, which are particularly useful for systems that evolve in time.
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