title: [Study on chemical constituents from the root of Hemerocallis citrina].
abstract: OBJECTIVE
  To study the chemical constituents root of Hemerocallis citrina.
  
  
  METHODS
  The chemical constituents were extracted by microwave method and purified by silica gel column. Their structures were elucidated by their physical and chemical properties and spectral methods.
  
  
  RESULTS
  7 compounds were isolated and identified as: chrysophanol(I), 2-methoxy-obtusifolin(II), obtusifolin (III), rhein (IV), aloe-emodin (V), hemerocallone ( VI) and hemerocallin (VII).
  
  
  CONCLUSIONS
  Compounds IV and VI are isolated from this plant for the first time.
authors.affiliation: Ningxia Hui Autonomous Region Guyuan Sanitary Supervision Institute, Guyuan 756000, China. nxgy2006@126.com
authors.forename: Zhi-Xiong
authors.initials: ZX
authors.lastname: Zhang
authors.forename: Yong-Feng
authors.initials: YF
authors.lastname: Liang
mesh_terms: D000880:Anthraquinones / Q000737:chemistry / Q000302:isolation & purification*; D031421:Hemerocallis / Q000737:chemistry*; D008872:Microwaves; D018517:Plant Roots / Q000737:chemistry*; D010945:Plants, Edible / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D011208:Powders; D013056:Spectrophotometry, Ultraviolet
chemical_list: D000880:Anthraquinones; D011208:Powders; C546709:obtusifolin; C518327:aloe emodin; C027113:chrysophanic acid; C020491:rhein