Viscosity-structure relationship of dilute triglycerides’ solutions correlation to retention time in reversed-phase liquid chromatography |
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Authors: | Maria Tasioula-Margari Ioannis N Demetropoulos |
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Affiliation: | (1) Department of Chemistry, University of Ioannina, Greece |
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Abstract: | The dynamic viscosity (η) of dilute solutions of the trigly-cerides triolein, trilinolein, trimyristin, tristearin and tripalmitin
in benzene at temperatures in the range of 25–37°C can be expressed in terms of the viscosity of the solvent (η0), 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 η=k0+k1 ln η0+k2 CN+k3 DB+k4 C satisfactorily describes (within the experimental error of 0.002 cp) the solution viscosity of triglycerides inp-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. |
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Keywords: | Dilute solution mechanism of retention reversed phase structure triglycerides viscosity |
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