title: [Studies on the chemical constituents of the stems of Piper betle].
abstract: OBJECTIVE
  To study the chemical constituents from the stems of Piper betle.
  
  
  METHODS
  Various chromatographic techniques were used to isolate and purify the constituents. The structures of these compounds were elucidated on the basis of spectral analysis.
  
  
  RESULTS
  Nine compounds were isolated from the petroleum ester and ethyl acetate soluble fractions of the 70% acetone extract and their structures were identified as 6beta-hydroxystigmast-4-en-3-one (1), beta-sitosterol (2), stigmasterol (3), oleanolic acid (4), 23-hydroxyursan-12-en-28-oic acid (5), beta-sitosterol-3-O-beta-D-glucoside-6'-O-palmitate (6), beta-daucosterol (7), (2S) -4'-hydroxy- 2,3-dihydroflavonone-7-O-beta-D-glucoside (8) and alpha-ethyl glucoside (9).
  
  
  CONCLUSIONS
  Among these compounds, 1, 3 -9 are isolated from this plant for the first time.
authors.affiliation: School of Chemistry and Biotechnology of Yunnan Nationalities University, Kunming 650031, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Yin
authors.forename: Xiang-Zhong
authors.initials: XZ
authors.lastname: Huang
authors.forename: Jiong
authors.initials: J
authors.lastname: Wang
authors.forename: Jian-Hui
authors.initials: JH
authors.lastname: Dai
authors.forename: Hui
authors.initials: H
authors.lastname: Liang
authors.forename: Yun
authors.initials: Y
authors.lastname: Dai
mesh_terms: D005960:Glucosides / Q000737:chemistry / Q000302:isolation & purification; D015394:Molecular Structure; D009828:Oleanolic Acid / Q000737:chemistry / Q000302:isolation & purification*; D031721:Piper betle / Q000737:chemistry*; D018547:Plant Stems / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D012855:Sitosterols / Q000737:chemistry / Q000302:isolation & purification; D013265:Stigmasterol / Q000737:chemistry / Q000302:isolation & purification*; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: C499902:2alpha,3beta,23-trihydroxyursane-12-en-28-oic acid; D005960:Glucosides; D012855:Sitosterols; D014315:Triterpenes; D009828:Oleanolic Acid; D013265:Stigmasterol; C108400:ethyl glucoside