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Laser Desorption-Ion Mobility Spectrometry As a Useful Tool For Surface Analysis

2016

Laser Desorption-Ion Mobility Spectrometry As a Useful Tool For Surface Analysis

INNMS 2016 Moscow - Invited lecture

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Laser desorption-ion mobility spectrometry as a useful tool for imaging of thin layer chromatography surface

2016

Ion mobility spectrometry TLC

Laser desorption-ion mobility spectrometry as a useful tool for imaging of thin layer chromatography surface

Journal of Chromatography A, Volume 1459, 12 August 2016, p. 145–151.  DOI: 10.1016/j.chroma.2016.06.069.

We present a novel method for coupling thin layer chromatography (TLC) with ion mobility spectrometry (IMS) using laser desorption technique (LD). After separation of the compounds by TLC, the TLC surface was sampled by the LD-IMS without any further manipulation or preparation. The position of the laser was fixed and the TLC plate was moved in desired directions by the motorized micro-positioning stage. The method was successfully applied to analyze the TLC plates containing explosives (tri nitro toluene, 1,3,5-trinitro- 1,3,5-triazacyclohexane, pentaerythritol tetranitrate, 2,4-dinitro toluene and 3,4-dinitro toluene), amino acids (alanine, proline and isoleucine), nicotine and diphenylamine mixtures and detection limits for these compounds were determined. Combination of TLC with LD-IMS technique offers additional separation dimension, allowing separation of overlapping TLC analytes. The time for TLC sampling by LD-IMS was less than 80 s. The scan rate for LD is adjustable so that fast and effective analysis of the mixtures is possible with the proposed method.

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Direct Liquid Sampling for Corona Discharge Ion Mobility Spectrometry

2015

Direct Liquid Sampling for Corona Discharge Ion Mobility Spectrometry

Anal. Chem., 2015, 87 (14), p. 7389–7394.   DOI: 10.1021/acs.analchem.5b01585.

We present a new technique suitable for direct liquid sampling and analysis by ion mobility spectrometry (IMS). The technique is based on introduction of a droplet stream to the IMS reaction region. The technique was successfully used to detect explosives dissolved in methanol and oil as well as to analyze amino acids and dipeptides. One of the main advantages of this technique is its ability to analyze liquid samples without the requirement of any special solution.

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