title: [Analysis of 1H-NMR fingerprint in stem of Dendrobium loddigesii].
abstract: OBJECTIVE
  To analyse the 1H-NMR finger-print of the stem of Dendrobium loddigesii.
  
  
  METHODS
  Silica gel column chromatography was used to separate the chemical constituents of SCE A of the stem of D. loddigesii. The characteristic signals of the H-NMR finger-print were analysed after determining the structures of the compounds isolated from SCE A.
  
  
  RESULTS
  1H-NMR finger-prints of the samples of D. loddigesii collected from different regions showed highly characteristic features and reproducibility. Four compounds predominant in SCE A were isolated and their structures were determined by spectral analysis as 1, 2, 3 and 4, respectively.
  
  
  CONCLUSIONS
  Compound 3 and 4 were isolated from D. loddigesii for the first time. The 1H-NMR finger-print of CGE A of the stem of D. loddigesii showed mainly the characteristic signals of the above four compounds and might be utilized for the original authentication of this plant.
authors.affiliation: Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese Academy of Sciences, Guiyang 550002, Guizhou, China.
authors.forename: Hai-lin
authors.initials: HL
authors.lastname: Qin
authors.forename: Jian-xin
authors.initials: JX
authors.lastname: Zhang
authors.forename: Zheng-tao
authors.initials: ZT
authors.lastname: Wang
authors.forename: Xiao-sheng
authors.initials: XS
authors.lastname: Yang
authors.forename: Luo-shan
authors.initials: LS
authors.lastname: Xu
authors.forename: Xiao-jiang
authors.initials: XJ
authors.lastname: Hao
mesh_terms: D001593:Benzyl Compounds / Q000737:chemistry / Q000302:isolation & purification; D001632:Bibenzyls; D031667:Dendrobium / Q000737:chemistry* / Q000145:classification; D006139:Guaiacol / Q000031:analogs & derivatives / Q000737:chemistry / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D018547:Plant Stems / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D013045:Species Specificity
chemical_list: D001593:Benzyl Compounds; D001632:Bibenzyls; C071845:dendrophenol; C478099:gigantol; D006139:Guaiacol