Difference in Essential Oil Composition of Rhizome of Polygonum bistorta L. from Different Asian Regions and Evaluation of its Antibacterial Activity
2012
Intisar, Azeem | Zhang, Lingyi | Luo, Huiyang | Zhang, Runsheng | Wu, Zhongping | Zhang, Weibing
Essential oils of rhizome of Polygonum bistorta L. collected from three different Asian regions (Shanghai, China; Guizhou, China, and Lahore, Pakistan) were extracted by hydrodistillation and analyzed by GC-MS. 81 compounds were obtained and 77 were successfully identified. The percentage yield ranged between 0.11 % - 0.29 %. A significant difference in their chemical composition was also found. Major constituents and their percentage ranges were determined as: furfural (0.4 - 16.4 %), oleic acid (4.3 - 8.9 %), oleic acid methyl ester (0.3 - 8.6 %), palmitic acid (4.8 - 6.6 %), 5-methyl furfural (0.5 - 6.5 %), linoleic acid (0.6 - 4.2 %), linoleic acid methyl ester (0.2 - 4.0 %) and cosanes (tetracosane to nonacosane). Similarity tests based on chemometric analysis were performed and results clearly showed the difference in composition among samples. The sample of Pakistani origin and one sample of Chinese origin were separately tested against 2 different bacterial strains and a difference was observed in their antibacterial activities as well.
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