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Title: GC/MS DETERMINATION OF 1-P-MENTHEN-8-THIOL IN GRAPEFRUIT JUICE

Author
item Goodner, Kevin
item CARLOS, MARGARIA - U.S. DISTILLERY PRODUCTS,

Submitted to: Proceedings of Florida State Horticultural Society
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 2/13/2004
Publication Date: 4/1/2004
Citation: Goodner, K.L., Carlos, M.A. 2003. Gc/ms determination of 1-p-menthen-8-thiol in grapefruit juice. Proceedings Of Florida State Horticultural Society. 116:424-425.

Interpretive Summary: P-menthene-8-thiol is a very potent aroma compound found 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. In this report, it is shown that utilizing a standard laboratory instrument, it is possible to quantitate p-menthene-8-thiol with minimal sample and relatively short preparation time.

Technical Abstract: P-menthene-8-thiol is a very potent aroma compound found 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. 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.