GC/MS determination of 1-p-menthen-8-thiol in grapefruit juice

Kevin L. Goodner, Carlos A. Margaria


P-menthene-8-thiol is a very potent aroma compound founIN GRAPEFRUIT JUICEd in grapefruit juice. It currently is not measured commercially because it is present in only trace quantities and due to the fact that it requires an expensive specialized detector. However, in this report, it is shown that utilizing a standard laboratory gas chromatography mass spectrometer (GC-MS), it is possible to quantitate p-menthene-8-thiol with minimal sample and relatively short preparation time. Current methods use 1000-5000 mL of juice while the method presented here uses only 30 mL. It was determined to be as effective as a sulfur specific detector (no difference in unknown concentration at 95% confidence level) and also to be able to quantitate much lower levels. A tentative limit of detection is reported to be 1 ng/g.


fruit aroma; fdp; sulfur volatiles

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Proc. Fla. State Hort. Soc.     ISSN 0886-7283