Intraspecies chemical variability of the essential oil of Ledum palustre
The compositions of the essential oils of marsh tea,Ledum palustre L., from the southern regions of Tomsk, Transbaikalia and Amur province, and also from the southern part of the island of Sakhalin have been analyzed in detail. The results obtained indicate the sharply pronounced intraspecies chemical variability of this plant. In addition to the chemotype of march tea with myrcene as a macrocomponent which is widely distributed in the European part of the USSR, another three chemotypes with the macrocomponents limonene, sabinen, and p-cymene have been revealed.
Chemical Composition and Antibacterial Activity of the Essential Oil from Chinese Wild Ledum palustre L. on Vibrio Parahaemolyticus
Objectives: To study the chemical components and antibacterial activity of essential oil from the aerial parts of Ledum palustre L. which were collected in Daxing’anling area of north-eastern China, in September 2014. Methods: The subcritical fluid extraction technology (SFE) was used to isolate the essential oil from the plant’s samples. Micro-SPE and GC-MS methods were applied to the identification of oil components and determination of their content in the essential oil. The antimicrobial activity of the essential oil was tested against the marine pathogen Vibrio parahaemolyticus at incubation of 37 oC. Results: The yield of extract from the aerial parts was 5.31%. The main constituents found were α-thujenal (22.48%), bicyclocompounds(18.72%), β-phellandrene(10.25%), benzene,1-methyl-3-(1-methylethyl)-(6.59%), propanal,2-methyl-3-phenyl(4.01%) and β-terpineol (3.04%). The essential oil from L.palustre at concentration of 5 g/L can inhibit the growth of V.parahaemolyticus obviously. Conclusion: This is the first report of an inhibitory activity of essential oil of L.palustre on the pandemic strain of V.parahaemolyticus in seawater. *Corresponding author: Liangliang Zhang, Jiangsu Province Biomass Energy and Materials Laboratory, Nanjing 210042, China; Tel: +86 25 85482463; Fax: +86 25 85482463; E-mail: zhll20086@163.com Received Date: December 16, 2016 Accepted Date: January 29, 2017 Published Date: February 03, 2017
Terpenoids of lodgepole pine bark
Abstract Additional extractives of lodgepole pine bark include pimaradiene, γ-cadinene, oplopanone (I), and the new natural products, 21-episerratenediol 21-methyl ether (IIa) and 18-norpimara-8(14),15-dien-4-ol (III). The structure of IIa was proved by converting it to 21β-methoxy-14-serraten-3-one (IIc) and to 21-episerratenediol dimethyl ether (IIb). The structure of III was proved by converting it and dihydropimaric acid (IVa) to 18-norpimar-8(14)-en-4-ol (IVb). The corresponding 19-norpimar-8(14)-en-4-ol (IVc) was also prepared.