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Procedure for Automated Background Correction in Flow Systems with Infrared Spectroscopic Detection and Changing Liquid-Phase Composition

机译:具有红外光谱检测和改变液相成分的流动系统自动背景校正程序

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This paper describes a partial least squares (PLS) based automatic procedure to correct for changes in the spectral contribution of the solvent or solvent mixtures from solute spectra recorded in these solvents. The procedure was developed for successful on-line Fourier transform infrared (FT-IR) detection in gradient high-performance liquid chromatography (HPLC) separations. It requires a reference FT-IR data set containing all possible combinations of the expected variation in solvent composition. Furthermore, a spectral region (A) in these spectra is required where the solvents show absorption but the analytes do not. This is the case for the system ACN:H2O, an often-applied solvent mixture in gradient HPLC, in the spectral region from 2300–2400 cm–1. By focusing on (A) the developed numerical method selects an appropriate background spectrum from the reference data set, which is then subtracted from the analyte spectra. The method was programmed in Matlab and tested on different isocratic and gradient on-line reversed phase liquid chromatography–Fourier transform infrared spectrometry (LC-FT-IR) data sets. This work describes a successful method to perform eluent correction in on-line coupling of FT-IR spectrometry with gradient LC.
机译:本文介绍了一种基于偏最小二乘(PLS)的自动程序,可从记录在这些溶剂中的溶质光谱中校正溶剂或溶剂混合物的光谱贡献变化。该程序是为在梯度高效液相色谱(HPLC)分离中成功进行在线傅立叶变换红外(FT-IR)检测而开发的。它需要参考FT-IR数据集,其中包含溶剂成分预期变化的所有可能组合。此外,在这些光谱中需要一个光谱区域(A),其中溶剂显示吸收,而分析物则没有。对于系统ACN:H 2 O,在梯度HPLC中经常使用的溶剂混合物,在2300–2400 cm –1 的光谱区域中就是这种情况。通过关注(A),开发的数值方法从参考数据集中选择合适的背景光谱,然后从分析物光谱中减去该背景光谱。该方法在Matlab中编程,并在不同的等度和梯度在线反相液相色谱-傅里叶变换红外光谱(LC-FT-IR)数据集上进行了测试。这项工作描述了一种成功的方法,可在FT-IR光谱与梯度LC在线耦合中执行洗脱液校正。

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    《Applied Spectroscopy》 |2009年第12期|1363-1369|共7页
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