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Sz. Nyiredy , in: Sz. Nyiredy (Ed.) Planar Chromatography-A Retrospective View for the Third Millennium, Springer, Budapest, 2001, pp. 103–119. Nyiredy Sz

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3773 3776 F. Geiss , Fundamentals of Thin Layer Chromatography (Planar Chromatography), Hüthig, Heidelberg, 1987. Geiss F

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C.F. Poole, in Sz. Nyiredy (ed.) , Planar Chromatography — A Retrospective View for the Third Millennium, Springer, Budapest, 2001. Poole C.F. Planar

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. Prosek, R.E. Kaiser , direct control of a CAMAG scanner to adjust plate position. R.E. Kaiser , www.planar-chromatography-by-kaiser.com Sorbfil video densitometer version 2

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14 393 395 Sz. Nyiredy , in: Sz. Nyiredy (ed.), Planar Chromatography — A Retrospective View for the Third Millennium, Springer

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32 1497 1503 W. Dammertz and B. Renger , Proc. Int. Symp. “Planar Chromatography 2002”, May 11–13, 2002, Hévíz, Hungary

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Reversed-phase planar chromatography has been used to study the hydrophobic properties of sixteen new herbicides. Solute retention factors in pure water, log k w , were determined by linear extrapolation and by the new method based on Ościk’s equation. The effect on solute retention and log k w values of the pH of the buffer used as mobile phase component was analyzed. The log k w values were proposed as descriptors of the hydrophobic properties of the compounds and so were compared with calculated log P values, i.e. partition coefficients in n -octanol-water systems.

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Seven pairs of cis-trans isomers of bis-steroidal tetraoxanes have been examined by both normal-phase (NP) and reversed-phase (RP) planar chromatography. Unmodified silica gel was used with ethyl acetate-toluene and ethyl acetate-petroleum ether as mobile phases in typical normal-phase systems. CN-silica with the mobile phases methanol-water and acetone-water and RP-18 silica with water-organic modifier (methanol, acetone, or dioxane) mobile phases were used as reversed-phase systems. For the RP systems a good linear correlation was established between R M values and amount ([%] ν/ν ) of organic modifier in the mobile phase (usually r > 0.99). It was found that under both NP and RP conditions cis isomers were more weakly retained than the corresponding trans isomers. The only exception to this was the chromatographic behavior of C(24) methyl esters. It was established that increasing the polarity of substituents at C(24) and C(24a) led to stronger retention in NP systems, i.e. weaker retention in RP systems. Highly selective separation was achieved in all the chromatographic systems investigated. Possible separation mechanisms are discussed on the basis of the results obtained.

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Sz. Nyiredy (ed.) Planar Chromatography. A Retrospective View for the Third Millennium, Springer, Budapest, 2001. Planar Chromatography. A Retrospective View for the Third Millennium

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http://www.planar-chromatography-by-kaiser.com/html/__mu-plc_pictograms.html N.A. Izmailov, M.S. Shreiber , Farmatsiya 3 (1938) 1

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