title: [Study toxicity-attenuating effect and dose-toxicity relationship of rhubarb by processing based on correspondence analysis].
abstract: OBJECTIVE
  To study the toxicity-attenuating effect and the dose-toxicity relationship of rhubarb by processing based on correspondence.
  
  
  METHODS
  The effects of different processed materials of rhubarb on the hepatic and renal functions of mice was researched in a way of parallel comparison, as well as the chemical alteration induced by processing was observed. Correspondence analysis, a kind of multivariate statistical analysis, was performed to explore the dose-toxicity relationship of processed materials of rhubarb.
  
  
  RESULTS
  No obvious toxic effect was found in mice after single intragastric administration of crude drug of rhubarb at dosage of 76 g x kg(-1), while some lesions to liver and kidney tissues were observed in mice after repeated administration of rhubarb and its processed materials for 14 days at the same dosage. In the correspondence analysis diagram, it could be deduced that there was definite dose-toxicity relationship of processed rhubarb as the distance between trial groups and control group increased along with the dosage and the toxicity. The distance of the processed rhubarb showed as the following consequence: crude drug of rhubarb > vinegar-processed rhubarb > alcohol-processed rhubarb > steamed rhubarb > carbonized rhubarb > Qingning pian. Theerefoer, the toxicity of processed rhubarb was much lower than that of crude drug and the extent of toxicity attenuation was related to the processing intensity. Meanwhile, the toxicity-attenuating effect of processed rhubarb was related to the decline of the contents of both anthraquinone glycosides and tannins, and the former was contributed remarkably to toxicity.
  
  
  CONCLUSIONS
  The toxicity-attenuating effect of processed rhubarb was verified in this study and the toxicity of steamed rhubarb attenuated notably while the pharmacological substances degraded little. The correspondence analysis would be useful to assess the pharmacological and toxic effects with multiple indexes of traditional Chinese medicines.
authors.affiliation: China Military Institute of Chinese Materia Medica, 302 Military Hospital, Beijing 100039, China.
authors.forename: Jiabo
authors.initials: J
authors.lastname: Wang
authors.forename: Yonggang
authors.initials: Y
authors.lastname: Ma
authors.forename: Cheng
authors.initials: C
authors.lastname: Jin
authors.forename: Ping
authors.initials: P
authors.lastname: Zhang
authors.forename: Xiaohe
authors.initials: X
authors.lastname: Xiao
authors.forename: Yanling
authors.initials: Y
authors.lastname: Zhao
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Xing
authors.forename: Yongshen
authors.initials: Y
authors.lastname: Ren
mesh_terms: D000818:Animals; D002626:Chemistry, Pharmaceutical / Q000379:methods*; D004305:Dose-Response Relationship, Drug; D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000633:toxicity*; D005260:Female; D007668:Kidney / Q000187:drug effects; D008099:Liver / Q000187:drug effects; D008297:Male; D051379:Mice; D011897:Random Allocation; D012250:Rheum / Q000737:chemistry*
chemical_list: D004365:Drugs, Chinese Herbal