General considerations and comparison between different chromatographic methods

1 General considerations and comparison between different chromatographic methods 

In complex photoreactions many products can be produced simultaneously during the photoprocess. For this reason separation techniques are desirable in principle. However, these techniques must allow an automatic observation during the reaction. The first applications of gas chromatography [104] demonstrated some problems. Liquid chromatography offers better results, since photoreactions are usually examined in liquid phases. Two principles are presented in the literature in detail. Both high performance liquid chromatography (HPLC) and thin-layer chromatography (TLC) are frequently used in analytical applications [105,106]. However, a few essential points with respect to their applicability to photokinetics have to be discussed  

Therefore, neither TLC nor HPLC techniques can be used in such a way 

Recently, spectra identification by use of spectra libraries [107] and the use of multicomponent analysis using chromatographic data have increased applicability of chromatography in combination with UVA is spectrometry. 

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