title: Antidiarrheal potential of standardized extract of Rhododendron arboreum Smith flowers in experimental animals.
abstract: OBJECTIVE
  To investigate standardized ethyl acetate fraction of Rhododendron arboreum (EFRA) flowers for antidiarrheal activity in experimental animals.
  
  
  METHODS
  A simple sensitive high performance thin layer chromatography (HPTLC) method was used for the determination of hyperin in EFRA. The standardized fraction was investigated for castor oil, magnesium sulfate-induced diarrhea, measurement of gastrointestinal transit using charcoal and castor oil-induced enteropooling.
  
  
  RESULTS
  The concentration of hyperin in flowers of R. arboreum was found to be 0.148% by HPTLC. Oral administration of EFRA at 100, 200 and 400 mg/kg exhibited dose-dependent and significant (P<0.05-0.001) antidiarrheal potential in castor oil and magnesium sulfate-induced diarrhea. EFRA at doses of 100, 200 and 400 mg/kg also produced significant (P<0.05-0.001) dose-dependent reduction in propulsive movement in castor oil-induced gastrointestinal transit using charcoal meal in rats. EFRA was found to possess an antienteropooling in castor oil-induced experimental animals by reducing both weight and volume of intestinal content significantly.
  
  
  CONCLUSIONS
  These findings demonstrate that standardized ethyl acetate fraction of R. arboreum flowers has potent antidiarrheal activity thus justifying its traditional use in diarrhea and have great potential as a source for natural health products.
authors.affiliation: Department of Pharmacology, Goel Institute of Pharmacy & Sciences, Lucknow, India.
authors.forename: Neeraj
authors.initials: N
authors.lastname: Verma
authors.forename: Anil P
authors.initials: AP
authors.lastname: Singh
authors.forename: Amresh
authors.initials: A
authors.lastname: Gupta
authors.forename: P K
authors.initials: PK
authors.lastname: Sahu
authors.forename: Ch V
authors.initials: ChV
authors.lastname: Rao