Abstract

“MPMS” is a commercially marketed capillary liquid crystal Mesogenic Polymeric Methyl (poly-) Siloxane stationary phase which is selective to solute molecular shapes. It is chemically different to other types of molecularly selective phases, such as the peptide methyl-polysiloxane “Chirasil-Val” and the various modified cyclodextrins (CD). This study measures how different in chromatographic behaviour are the phase trio of a CD to be selected here, and the above two methyl polysiloxanes. Ten selected solutes from volatile oils are used to record relative retentions to n-undecane on each phase, and these are used in a procedure previously itemised for Chirasil-Val to seek the lowest correlation coefficients between results for pairs of phases, which leads to “Chiraldex G-DA” being the selected most different CD (out of 14) to MPMS and Chirasil-Val. Another 21 solutes are also examined on this phase trio, and retention ratios of the 31 solutes between pairs of phases are calculated. These are indicative of an unknown solute being an aromatic substance, or a bicyclic monoterpenoid.

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