Abstract:

The NMR chromatog. method is applied to a class of mols. with similar phys. properties. We correlate the sepn. ability of microemulsions to the phys. properties of the analyzed mols. Flavor and aroma compds. are very widespread. Compositional anal. is in many cases tedious. Any new method of anal. is always useful and challenging. Here we show a new application to a class of fragrance mols., with only a moderate variation in their chem. and phys. characteristics. Up to 11 selected compds. in one mixt. are resolved in one spectrum by NMR chromatog., despite the similarity of the compds. The differences between O/W and W/O microemulsions and their resoln. mechanism as applied to fragrance mols. are explained in terms of hydrophilicity and lipophilicity and effective crit. packing parameters of the microemulsions. The obsd. diffusion rates are shown to correlate with solvation parameters. These results can be used to est. the diffusion rates of mols. to be sepd., allowing selection of the microemulsion or NMR chromatog. solvent appropriate for each specific application. [on SciFinder(R)]