Abstract
“Graphpac” was investigated to see if carbon was a better gas chromatographic support than silica for columns of 3% of the liquid crystal bismethoxybenzilidinebitoluidine or (MBT) 2. Six volatile oil component solutes exhibited the same elution sequence as from silica, but with lower relative retention times with respect to linalol —about 50% for some aromatics, reflecting the much lower polarity of the carbon-supported packing indicated by cuminal/caryophyllene ratio. Caryophyllene had greatly increased relative retention, and this was further raised if a low-loading of 0.3% (MBT) 2 was used on “Graphpac”, indicating even lower polarity. This column was not reliable below 200°C, but an initial period at 203°C, followed by rapid heating to 230°C, gave reasonable results for some significant constituents of teatree oil. Nevertheless, 3% (MBT) 2 on “Graphpac” was preferable for assaying this and sweet fennel oil by providing a more reliable melted liquid crystal stationary phase, with low temperature versatility.
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