Direct analysis of thin-layer chromatographic spots of narcotics by means of diffuse reflectance Fourier transform infrared spectroscopy

1995 ◽  
Vol 119 (1-2) ◽  
pp. 129-135 ◽  
Author(s):  
J. Mink ◽  
E. Horv�th ◽  
J. Krist�f ◽  
T. G�l ◽  
T. Veress
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Thin Layer ◽  
Fourier Transform Infrared Spectroscopy ◽  
Diffuse Reflectance ◽  
Fourier Transform Infrared ◽  
Direct Analysis

Functional Group Analysis of Interferometric Data from Gas Chromatography Fourier Transform Infrared Spectroscopy

1980 ◽  
Vol 34 (1) ◽  
pp. 7-14 ◽  
Author(s):  
R. C. Wieboldt ◽  
B. A. Hohne ◽  
T. L. Isenhour
Keyword(s):  
Gas Chromatography ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Functional Group ◽  
Group Analysis ◽  
Fourier Transform Infrared ◽  
Direct Analysis ◽  
Cumulative Sum ◽  
Absorption Bands

A method is presented for the direct analysis of interferometric data from gas chromatography Fourier transform infrared spectroscopy (GC/FTIR). A synthetic interferogram is initially produced which represents the characteristic absorption features of a particular functional group or compound class. A zero displacement correlation is performed between this test interferogram and each sample interferogram from the GC data. The presence of the desired functionality in the GC effluent is indicated by a small value of the resulting cumulative sum. A “correlogram” which emulates the response from a chemically specific GC detector is obtained by plotting the cumulative sum from each sample correlation. Synthetic interferograms representing infrared absorption bands which are truly specific for a particular functionality yield the best results.

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