title: [Chemical constituents from air-dried Piper longum].
abstract: OBJECTIVE
  To study the chemical constituents of Piper longum.
  
  
  METHODS
  The whole plant of air-dried P. longum. was extracted with 95% EtOH. The EtOH extract was suspended in H2O and extracted with petroleum ether, CHC13 and n-BuOH, successively. The compounds were isolated and purified by column chromatography from the CHCl3 fraction, and identified based on spectral analyses (MS,1H-NMR, 13C-NMR).
  
  
  RESULTS
  Threeteen compounds were isolated from P. longum, and were characterized as 1-(3',4'-methylenedioxyphenyl)-1E-tetradecene (1), 3-(3', 4'-methylenedioxophenyl)-propenal (2), piperoic acid (3), 3',4'-di-hydroxy-biabola-1,10-diene (4), eudesm-4(15)-ene-1beta, 6alpha-diol (5), 7-epi- eudesm-4( 15)-ene-1beta, 6beta-diol (6), guineesine (7), piperine (8), pipericide (9), 2E, 4E-dienamide (10), (2E, 4E, 8E) -N-isobutylhenicosa-2,4,8-trienamide (11), piperlonguminine (12), methyl piperate (13),
  
  
  CONCLUSIONS
  Compounds 1-6 were obtained from P. longum for the first time.
authors.affiliation: State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, China.
authors.forename: Wenfeng
authors.initials: W
authors.lastname: Liu
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Jiang
authors.forename: Jijun
authors.initials: J
authors.lastname: Chen
authors.forename: Xuemei
authors.initials: X
authors.lastname: Zhang
authors.forename: Yunbao
authors.initials: Y
authors.lastname: Ma
mesh_terms: D000388:Air; D003890:Desiccation; D009930:Organic Chemicals / Q000032:analysis / Q000302:isolation & purification; D031701:Piper / Q000737:chemistry*
chemical_list: D009930:Organic Chemicals