Chemical Components of Volatile Oil from Leaves and Stems of Celtis sinensis Pers

Abstract

Volatile oil compositions of leaves and stems in Celtis sinensis Pers. were reported. Both essential oils were extracted by supercritical fluid extraction of CO₂ (SFE-CO₂). A total of 44 components were identified in the essential oil of leaves that accounted for 91.09 % of the compositions. The most abundant constituents were found in the leaves, mainly including phthalic acid, diisobutyl ester (20.79 %), cyclohexanone (16.47 %), 2,2'-methylenebis[6-(1,1-dimethylethyl)-4-methyl]-phenol (8.86 %) and 2,2,3,4-tetramethyl- hex-5-en- 3-ol (5.13 %). There were 52 components found in the volatile oil of stems, representing 96.71 % of the total area. Stems essential oil constituents with higher content were found such as phthalic acid, diisobutyl ester (23.76 %), cyclohexanone (14.78 %), 2,2'-methylenebis[6-(1,1-dimethylethyl)-4-methyl]- phenol (9.50 %), 1,3-dimethyl- benzene (6.07 %). Twenty-three common compounds accounted for 65.69 % and 71.63 % of total contents in leaves and stems showed a certain similarity in both essential oils. Meanwhile, 50 non-common compositions resulted in some subtle differences to some degree.

Key words:

• Celtis sinensis Pers
• leaves
• stems
• volatile oil
• chemical components