Germacrenes in citrus peel oils

Feger, W.; Brandauer, H.; Ziegler, H.

Germacrenes in citrus peel oils

2001

Feger, W. | Brandauer, H. | Ziegler, H.

The germacrene composition of various citrus peel oils was investigated. Detection and quantification of the thermally sensitive germacrenes A and C was achieved by employing extremely gentle GC conditions with 100 degrees C maximum in injector and GC-oven. Germacrene A was found in all analyzed citrus oils with values from trace level to 0.46% of the volatiles, depending on variety and provenance. Germacrene C was identified in the peel oils of bergamot, bitter orange, lime, Minneola, Ortanique tangor, pummelo, Sweetie, tangerine and Yuzu with values of 0.01-0.59%. In this context, germacrene C always occurred accompanied by germacrene B. Germacrene D was present in all citrus peel oils, with the exception of lemon, whereas bicyclogermacrene was a constituent of all examined citrus oils, except for lime. Distilled lime oil as acidic steam distillate possesses a special position, as it contained only germacrene B.

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