Abstract

The volatile organic constituents from the leaf, stem and flower of Pogostemon plectranthoides Desf. were obtained by hydro-distillation and analysed using gas chromatography equipped with a flame ionisation detector (GC-FID) and gas chromatography coupled with mass spectrometry (GC-MS). Sixty-two, fifty-seven and forty-four compounds were identified from leaf oil (LO), stem oil (SO) and flower oil (FO). The identification was done according to their mass spectra, and their relative retention indices were determined on a non-polar stationary phase capillary column (ZB-5), representing 96.4% (LO), 94.9% (SO) and 95.2% (FO) of the total oil constituents. The major constituents were identified as (E)-β-ocimene (42.6–6.9%), germacrene D (21.1–5.9%), trans-β-guaiene (10.6–6.8%) and β-caryophyllene (9.6–6.3%) from various parts of the plant P. plectranthoides. The oil was found (E)-β-ocimene-germacrene D-trans-β-guaiene chemotypes from the plant growing in the Western Ghats of this region.

摘要

Pogostemon plectranthoides Desf叶、茎和花的挥发性有机成分。通过水蒸馏获得并使用配备有火焰离子化检测器的气相色谱 (GC-FID) 和气相色谱与质谱联用 (GC-MS) 进行分析。从叶油 (LO)、茎油 (SO) 和花油 (FO) 中鉴定出 62、57 和 44 种化合物。根据它们的质谱图进行鉴定，在非极性固定相毛细管柱（ZB-5）上测定它们的相对保留指数，分别代表96.4%（LO）、94.9%（SO）和95.2%（FO）的总油成分。主要成分被确定为 ( E )- β -罗勒烯 (42.6–6.9%), 锗烯 D (21.1–5.9%),反式- β -guaiene（10.6-6.8％）和β从植物的各个部分石竹烯（9.6-6.3％）P. plectranthoides。油被发现（ē） - β -罗勒烯，大根香叶D-反式- β -guaiene化学型从植物在这一地区的西高止山脉增长。