title: [Influence of different collection time on yield and constituents of essential oil of herba pogostemonis from Gaoyao County].
abstract: The constituents of the volatile oil of Herba Pogostemonis from Gaoyao county collected at various different time by GC/MS combination technology were analysed and compared. The results showed that the average dry weight of single plant(i.e. yield) increased gradually from July to next April, the content of volatile oil was highest in November. The contents of pogostemone in the leaf oil were higher in July and September, then decreased gradually with growth time; pachouli alcohol was higher in September, October and November, lower in other months. The contents of pogostmone in stem oil were higher in July, October and next January, lowest in November. The content change of pachouli alcohol in stem oil were not obvious in all growth time, higher slightly only after November. Other compounds were not showed their variation law. So the quality of Herba Pogostemonis collected in November was higher if the content of volatile oil was used as a standard of quality evaluation, the result was in accordance with traditional collection experience.
authors.affiliation: Guangdong College of Pharmacy, Guangzhou 510224.
authors.forename: J
authors.initials: J
authors.lastname: Luo
authors.forename: Y
authors.initials: Y
authors.lastname: Feng
authors.forename: X
authors.initials: X
authors.lastname: Guo
mesh_terms: D004365:Drugs, Chinese Herbal / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry; D009822:Oils, Volatile / Q000737:chemistry* / Q000302:isolation & purification; D018515:Plant Leaves / Q000737:chemistry; D010938:Plant Oils / Q000737:chemistry* / Q000302:isolation & purification; D018547:Plant Stems / Q000737:chemistry; D012621:Seasons
chemical_list: D004365:Drugs, Chinese Herbal; D009822:Oils, Volatile; D010938:Plant Oils