USE OF 3 MOLECULARLY TOROID PHASES FOR THE GAS-CHROMATOGRAPHY OF SOME VOLATILE OIL CONSTITUENTS, AND COMPARISON WITH LIQUID-CRYSTAL PHASES

A commercially available capillary, "Chiraldex-A-DA" and two 24-crown-8-ethers in packed columns, have been used in the gas chromatographic examination of some volatile oil constituents. They lose some selective-retaining properties at high temperatures. These molecular toroid phases show a characteristic elution sequence for aromatics: cuminal-anethole-safrole-thymol, different to liquid crystals. The Chiraldex and dicyclohexanocrown exhibit good retention of geraniol and caryophyllene; whereas the more polar dibenzocrown shows poor geraniol and good estragole retention, compared to other solutes.