Bark Essential Oils of Zanthoxylum clava-herculis and Ptelea trifoliata: Enantiomeric Distribution of Monoterpenoids

Abstract

The bark essential oils of Zanthoxylum clava-herculis and Ptelea trifoliata (Rutaceae) were obtained by hydrodistillation and analyzed by both gas chromatography as well as chiral gas chromatography coupled with mass spectrometry. Z. clava-herculis bark oil was dominated by sabinene [47.0%, 95% (–)-sabinene], limonene [18.7%, 99% (+)-limonene], and terpinen-4-ol [12.9%, 75% (–)-terpinen-4-ol]. The major components in P. trifoliata bark oil were limonene [15.2%, 99% (–)-limonene], sabinene [6.9%, 79% (–)-sabinene], and β-phellandrene [6.2%, 87% (–)-β-phellandrene].