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The compositions of the essential oil from Rubiae Radix (roots of Rubia cordifolia, Rubiaceae) have been investigated by capillary GC and GC/MS. The important odor-active compounds were also detected in the oil using GC-Olfactometry (GC-O) and aroma extract dilution analysis (AEDA). As a result, 43 components, accounting for 91.5 % of the total oil, were detected. The main components in the essential oil were mollugin (19.6%), furomollugin (17.4%), eugenol (12.7%) and (E)-anethole (10.6%). AEDA and GC-O showed that geraniol, eugenol and geranyl acetate were the most aroma-compounds.

Identification of the Key Aroma Compounds in Dried Roots of Rubia cordifolia