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The influence of increasing stationary phase polarity on the retention index increments of homologous aromatic esters is reported. The results are discussed in terms of the findings of earlier reports that have considered saturated and unsaturated aliphatic esters.
Thermodynamic characteristics of the behaviour of higher aliphatic amines on chromatographic paper and cellulose powder are presented. A new method is described aiming to eliminate systematic error, connected with the visualization of the chromatographic spots on the investigated sorbents.
The retention behaviour of aromatic acids was examined in a reversed-phase mode liquid chromatography. Macro porous styrene-divinylbenzene copolymers were selected on the basis of their chemical stability throughout the entire pH range. The effect of addition of a hydrophobic ion in the eluent...
The gas chromatographic retention characteristics of 56 nitrated polycyclic aromatic hydrocarbons (nitro-PAH) have been studied using SE-52 coated on fused-silica capillary tubes. The relative retention times of these solutes were measured at 130°, 140°, and 150°C in order to determine the...
Open column, high-performance liquid, and gas-liquid chromatographic procedures have been developed for the purification of synthetic warburganal intermediates (II–V) and drimenin (VI). The usefulness of thinlayer chromatography in revealing an obscured, unwanted product (VI) instead of a...
The additivity concept in the retention index system of Kovats has been examined for a series of n -alkylbenzenes and their o - and p -monosubstituted nitro-, amino-, and chloro-derivatives. Anomalous behaviour is exhibited by the first three members of the series on both polar and non-polar...
Universal equations have been obtained for aliphatic homologous series permitting the calcualtion of the specific retention volume, retention index, partial free energy of sorption and the change in the energy contribution of a methylene unit depending on the length of the carbon chain. Possible...
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