COMPARISON OF 2 ESTERIFIED GAMMA-CYCLODEXTRINS WITH SOME OTHER CHIRALLY SELECTIVE GAS-CHROMATOGRAPHIC PHASES USING VOLATILE OIL CONSTITUENTS

Twenty-six different volatile oil constituents were used as solutes to check some chirally selective gas chromatographic phases for similar behaviour. Some diverse monoterpenoids and aromatics gave almost the same relative retention times on three differently esterified gamma-cyclodextrins. However, rigid molecular bicyclic monoterpenes yielded different results on the trifluoroacetyl ester phase, and caused a changed elution sequence. This phase was equivalent to the previously used propionyl ester for some solutes, with increase in values, when compared to an alpha-cyclodextrin ester phase, remaining over 100% for most bicyclics. The gamma-cyclodextrin butyryl ester was equivalent to Chirasil-Val for several solutes, but not for some bicyclic terpenes and aromatics, and it did not give as good an analysis of patchouli oil sesquiterpenes.