Viscosity-Structure Relationship of Dilute Triglycerides Solutions - Correlation to Retention Time in Reversed-Phase Liquid-Chromatography

 
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1992 (EN)
Viscosity-Structure Relationship of Dilute Triglycerides Solutions - Correlation to Retention Time in Reversed-Phase Liquid-Chromatography (EN)

Tasioulamargari, M. (EN)

Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας (EL)
Tasioulamargari, M. (EN)

The dynamic viscosity (eta) of dilute solutions of the triglycerides triolein, trilinolein, trimyristin, tristearin and tripalmitin in benzene at temperatures in the range of 25-37-degrees-C can be expressed in terms of the viscosity of the solvent (eta0), the triglycerides' concentration (C) and structural characteristics, such as the length of the carbon chains (CN) and the number of double bonds (DB). The simple empirical equation ln eta = k0 + k1 ln eta0 + k2 CN + k3 DB + k4 C satisfactorily describes (within the experimental error of 0.002 cp) the solution viscosity of triglycerides in p-xylene when using the coefficients derived from the benzene solutions. In addition, a relation is derived extending the application of the above-mentioned empirical equation to multicomponent dilute solutions. This last one describes the dilute solution viscosity of natural oils in benzene and agrees with the experimental values. Furthermore, the triglycerides that have equal partition numbers in reversed-phase liquid chromatography (RPLC) exhibit equal values for the solution viscosity. This relationship is similar to the equation expressing the retention time of RPLC in terms of the structure of the solute. Hence, it is suggested that the shape of the solute, which is a significant factor for the solution viscosity of triglycerides, also plays an important role in the retention mechanism of RPLC. (EN)

dilute solution (EN)

Πανεπιστήμιο Ιωαννίνων (EL)
University of Ioannina (EN)

Journal of the American Oil Chemists Society (EN)

English

1992

<Go to ISI>://A1992JZ48500009



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