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The dependence of sorption properties on the nature of heteroatoms in substituted five- and six-membered heterocyclic compounds with two heteroatoms (sulfur and oxygen), thiophenes and furans bearing alkyl, formyl, acetyl, and sulfide substituents have been investigated. Equations for calculating the retention indices of analogs have been proposed, and the indices of 35 previously non-investigated substances of these classes have been predicted.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1224–1227, July, 1993. 相似文献
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The sorption ofRosmarinus Officinals L. essential oil components by the corn starch cryosponge was studied. The hydrophobic interactions of monoterpene hydrocarbons with polysaccharides of the starch result in their quantitative sorption. The sorption of aroma compounds containing oxygen atoms is twofold lower. the templating effect of mono- and disaccharides (glucose, sucrose, maltose, and some essential oil components) was found. 相似文献
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Rimma V. Golovnya Diana N. Grigoryeva Alexei V. Vasilyev 《Journal of separation science》1991,14(11):741-744
The enthalpy and entropy of sorption of methylene units in the homologous series of n-alkyl acetates; methyl, n-butyl, and phenyl n-alkyl ketones; and the methyl esters and chloroanhydrides of n-aliphatic carboxylic acids have been determined on an SE-54 capillary column. The enthalpy of sorption of the first methylene unit is anomalously high when the growing n-alkyl chain is connected directly to a carbonyl group. This effect is a result of intramolecular interaction between neighboring methyl and carbonyl groups. It has been shown by measurement of the enthalpy and entropy of sorption of the difluoromethylene unit in the series of n-hexyl esters of perfluorinated carboxylic acids that for these compounds the effect is absent. The intramolecular interaction was found to increase in the order methyl butyl ketone < methyl phenyl ketone < methyl acetate < acetyl chloride < acetone. 相似文献
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Summary A thermodynamic criterion, Q, is suggested which permits to estimate the difference in the functional group energy of interactions for two different stationary phases. The linear dependence of Q on the homolog number m of any series Rm X can be used as the thermodynamic criterion for the identification of substances by GC analysis.Enlarged text of the paper presented at the Fourth Danube Symposium on Chromatography, Bratislava, Czechoslovakia, September 1983. 相似文献
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New possibilities for using the equation that takes into account the nonlinear variation of parameters of the reference n-alkane scale for the calculation of retention indices of polar substances at different modes of temperature programming were considered. The advantages of this equation over the linear scale used traditionally were demonstrated in relation to C3—C11 alkan-1-ols. The equation appears to have considerable promise regarding the search for the equivalent isothermal index. 相似文献
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Golovnya RV 《Talanta》1987,34(1):51-60
A review is given of the literature on the analysis of complex mixtures of organic compounds and a procedure proposed for the separation and identification of the components of such mixtures. Retention data obtained with several chromatographic columns are combined with information from mass and Fourier-transform infrared spectra and identifications made with the aid of a computer. 相似文献