title: Analysis of precocenes in the essential oil of Ageratum spp. by reverse-phase high-performance liquid chromatography.
abstract: The chromenes precocene I (7-methoxy-2,2-dimethylchromene) and precocene II (6,7-methoxy-2,2-dimethylchromene) extracted from Ageratum houstonianum and A. conyzoides have been analysed by reverse-phase high-performance liquid chromatography. Separation was achieved using a C18 column eluted with a linear gradient of acetonitrile and water. Precocenes I and II in the essential oils were determined to be 270 +/- 23 and 482 +/- 34 mg/mL in A. houstonianum, and 687 +/- 21 and 20 +/- 2 mg/mL in A. conyzoides.
authors.affiliation: Department of Chemistry and Biochemistry, Himachal Pradesh Krishi Vishvavidayalaya, Palampur, H.P., India. ivriplp@nde.vsnl.net.in
authors.forename: K
authors.initials: K
authors.lastname: Sharma
authors.forename: O P
authors.initials: OP
authors.lastname: Sharma
mesh_terms: D019659:Asteraceae / Q000737:chemistry*; D001578:Benzopyrans / Q000032:analysis*; D002138:Calibration; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D009822:Oils, Volatile / Q000737:chemistry*; D015203:Reproducibility of Results; D013056:Spectrophotometry, Ultraviolet
chemical_list: D001578:Benzopyrans; D009822:Oils, Volatile; C014163:precocene II; C019539:precocene I