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  • 1 University of Technology and the Arts in Bielsko-Biała Poland
  • | 2 Silesian University Institute of Chemistry 9 Szkolna Street 40-006 Katowice Poland
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In our earlier papers we provided indirect experimental evidence strongly in support of our long-established hypothesis that aliphatic ligands on chemically bonded TLC-type stationary phases (i.e. RP-18, RP-8, CN, and Diol) are partially aromatized relatively easily at considerably elevated temperatures (i.e. much higher than 100°C). The first indication of such a possibility was apparent from Raman spectra obtained from these phases by use of a high-power laser-light source emitting in the NIR range. Irradiation of samples of the adsorbents with the NIR light caused their evident heating and the consequent appearance of a predominant Raman band in the so-called aromatic region of the spectra. Later this unexpected, and in some ways disturbing, phenomenon was utilized positively in a new method for Raman spectroscopic evaluation of the density of coverage of the silica matrix with octadecyl ligands.In this paper we report results from an experiment designed to provide more convincing and direct evidence in support of our hypothesis about this partial aromatization. To collect such evidence we had to re-design the procedure used to heat the samples of stationary phase, and to find the most efficient means of extracting and separating the aromatization products. It became obvious that to obtain readily measurable quantities of such products the samples should be heated in a closed system (e.g. in a sealed glass ampoule or in the stainless steel tube which forms part of the apparatus for accelerated solvent extraction, ASE) which prevents the compounds from escaping from the reaction system at high temperatures. We then used two advanced methods of solvent extraction — ultrasonic extraction and ASE — to separate the expected aromatization products from the solid matrix of the adsorbents investigated. Finally, analysis of the extracts obtained was performed by HPLC with diode-array detection. Our results furnish convincing evidence of an efficient aromatization process occurring equally with TLC-type octadecyl and octyl ligands heated at 170°C.

  • G. Kowalik, K. Rogosz , and T. Kowalska , J. AOAC Int. 82 (1999) 297–304.

    Kowalska T. , '' (1999 ) 82 J. AOAC Int. : 297 -304.

  • G. Kowalik, K. Rogosz, K. Bojarska , and T. Kowalska , J. Planar Chromatogr. 12 (1999) 429–434.

    Kowalska T. , '' (1999 ) 12 J. Planar Chromatogr. : 429 -434.

  • G. Kowalik, B. Klama, R. Okopska , and T. Kowalska , J. Planar Chromatogr. 13 (2000) 25–29.

    Kowalska T. , '' (2000 ) 13 J. Planar Chromatogr. : 25 -29.

  • G. Kowalik , and T. Kowalska , J. Planar Chromatogr. 13 (2000) 348–353.

    Kowalska T. , '' (2000 ) 13 J. Planar Chromatogr. : 348 -353.

  • T. Kowalska, G. Kowalik , and W. Prus , Proc. Symp. Planar Chromatography 2001, Lillafüred, Hungary, 25–25 June 2001, L-8.

    Prus W. , '', in Proc. Symp. Planar Chromatography 2001 , (2001 ) -.

  • W. Prus, J. Fabia, C. Dobosz, B. Szlosarczyk, A. Strządała , and T. Kowalska , J. Planar Chromatogr. 14 (2001) 378–383.

    Kowalska T. , '' (2001 ) 14 J. Planar Chromatogr. : 378 -383.

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Editor(s)-in-Chief: B. Spangenberg

Managing Editor: Kakuk Ágnes

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  • T.H. Dzido (Lublin, Poland)
  • Á. M. Móricz (Budapest, Hungary)
  • C.F. Poole (Detroit, MI, USA)
  • E. Reich (Muttenz, Switzerland)
  • B. Renger (Radolfzell, Germany)
  • I. Vovk (Ljubljana, Slovenia)

 

Advisory Board

  • E. BODOKI (Cluj-Napoca, Romania)
  • U. A. TH. BRINKMAN (Amsterdam, The Netherlands)
  • I. CHOMA (Lublin, Poland)
  • V. COMAN (Cluj-Napoca, Romania)
  • W. DAMMERTZ (Kressbronn, Germany)
  • K. FERENCZI-FODOR (Budapest, Hungary)
  • G. INDRAYANTO (Surabaya, Indonesia)
  • R. E. KAISER (Bad Dürkheim, Germany)
  • I. KLEBOVICH (Budapest, Hungary)
  • T. KOWALSKA (Katowice, Poland)
  • L. LEPRI (Florence, Italy)
  • E. MINCSOVICS (Budapest, Hungary)
  • D. NUROK (Indianapolis, IN, USA)
  • B. RENGER (Radolfzell, Germany)
  • J. K. RÓŻYŁO (Lublin, Poland)
  • J. SHERMA (Easton, PA, USA)
  • M. WAKSMUNDZKA-HAJNOS (Lublin, Poland)
  • D. WEDGE (Mississippi, USA)

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Address: P.O. Box 245. H-1519 Budapest, Hungary
Fax: +36 1 464 82 95
E-mail: jpc@akkrt.hu

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Journal of Planar Chromatography - Modern TLC
Language English
Size A4
Year of
Foundation
1988
Volumes
per Year
1
Issues
per Year
6
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0933-4173 (Print)
ISSN 1789-0993 (Online)

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