SUMMARY The bicyclic conjugated sesquiterpene ketone, nootkatone, has been found in grapefruit peel oil and in peel‐oil‐free grapefruit juice. The flavor intensity of grapefruit oil appears to be related to the relative abundance of nootkatone. A combination of gas‐liquid chromatography and thin‐layer chromatography revealed the presence of this ketone, which was identified by its infrared spectrum and the melting point of its 2,4‐dinitrophenylhydrazone derivative. Traces of nootkatone were found also in bergamot, lemon, lime, orange, and tangerine oils.
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MacLeod et al. (1964) studied this question.
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