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The fragmentation mechanisms leading to the major ions in the mass spectra of the trimethylsilyl derivatives of zingerone, the gingerols, shogaols, gingediols, gingerdiones and hexahydrocurcumins from ginger (Zingiber offieinale Roscoe) were studied with the aid of deuterium labelling and high resolution mass measurements.

under contract No. F33615-78-C-2075, and by the Division of Chemical Sciences, Office of Basic Energy Sciences, U.S. Department of Energy, under contract W-7405-eng-26 with the Union Carbide Corp. M.S. is grateful for financial assistance from Norges Teknisk-Naturvitenskapelige Forskningsrád. We note with thanks the technical assistance of J. Cobb and D. Goff, and helpful advice from J. Brynestad and C. A. Angelí.

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