Yoshitaka Ueyama

The Chemical Composition of the Essential Oil of Daphne genkwa Sieb. et Zucc.

ABSTRACT The chemical composition of the essential oil of Daphne genkwa Sieb. et Zucc. from China was investigated by a combination of chromatographic and spectroscopic techniques and 121 compounds were identified. The major components of the oil were furfural (2.8%), α-copaene (3.1%), α-santalene (6.9%), β-caryophyllene (3.4%), β-santalene (2.4%), δ-cadinene (4.0%), methyl eugenol (4.6%), nerolidol (2.0%), elemicin (4.5%), and 2, 3-dihydrobenzofuran (2.7%).

The Chemical Composition of the Flower Oil and the Leaf Oil of Michelia alba D.C.

ABSTRACT The chemical composition of the flower concrete oil and leaf oil ofMichelia alba have both been examined by a combination of GC/MS and retention indices. Approximately 100 compounds were characterized in both oils, with linalool being the major component of the flower oil (72.8%) and the leaf oil (80.1%), respectively. The most abundant minor components of the flower oil were α-terpineol (6.04%), β-phenylethyl alcohol (2.58%), β-pinene (2.39%), methyl 2-methylbutyrate (1.46%), geraniol (1.23%), and 1, 8-cineole (1.03%). The most abundant minor components of the leaf oil were β-caryophyllene (3.0%), β-elemene (1.7%), caryophyllene oxide (1.68%), and nerolidol (1.19%). Over 70% of the components characterized in the oils were found as trace constituents (<0.05%). Enantiomeric separation using chiral GC revealed that the absolute configuration of linalool was (R)-75%: (S)-25% and (R)-95.3%: (S)-4.7% for flower oil and leaf oil, respectively.