Chemical constituents of leaf essential oils of four Scrophulariaceae species grown in Vietnam

Abstract

In the present investigation, the essential oil compositions of four individual plants from Scrophulariaceae family cultivated in Vietnam were reported. The air-dried plants were hydrodistilled (Vietnamese Pharmacopoeia) and the oils were analyzed by gas chromatography-flame ionization detector (GC-FID) and gas chromatography-mass spectrometry (GC-MS) techniques. The essential oils content varied between 0.15% and 0.40% (v/w) on a dry weight basis. Monoterpenes (74.0%–85.1) represent the main class of compound in the oils. Adenosma bracteosa Bon., afforded oil whose major compounds were carvacrol (37.2%), carvarol methyl ether (23.2%), α-bisabolene (15.9%) and γ-terpinene (9.2%). The oil of Adenosma indiana (Lour.) Merr., comprised mainly of limonene (25.1%), 1,8-cineole (20.1%) and α-pinene (17.2%). However, methyl benzoate (27.7%), pulegone (23.4%) and limonene (20.2%) were the significant compounds of Limnophila aromatica (Lour.) Merr., while Limnophila micrantha (Benth.) Benth., gave oil whose main compounds are mentha-1,5,8-triene (38.5%) and β-myrcene (24.4%).

Keywords:

• Adenosma bracteosa
• Adenosma indiana
• Limnophila aromatica
• Limnophila micrantha
• essential oil composition
• monoterpenes
• sesquiterpenes

Acknowledgements

Authors are grateful to Mrs. Ogunwande Musilimat for the typesetting of the manuscript.

Disclosure statement

No potential conflict of interest was reported by the authors.