OBJECTIVETo study potential antioxidant, analgesic, antidiarrheal, and antibacterial activities of the ethanol extract of Musa seminifera Lour. fruit in different established in vivo and in vitro experimental models.

METHODSIn vitro antioxidant activity was studied in 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical-scavenging assay. Phenolic content was determined using Folin-Ciocalteu's reagent. Reducing ability was evaluated by ferric reducing power assay. Peripherally and centrally acting analgesic activity was studied in three different in vivo models, namely, acetic acid-induced writhing, hot-plate test, and tail-flick test in Swiss albino mice. In vivo antidiarrheal activity was evaluated in castor oil- and magnesium sulfate-induced diarrhea in mice. Gastrointestinal motility test was also carried out in mice. All studies in mice were undertaken at the doses of 250 and 500 mg/kg body weight. Antibacterial activity was assessed by disk diffusion assay against some Gram-positive and Gram-negative bacterial strains. Acute toxicity test was conducted to assess the safe doses of the extract.

RESULTSThe extract showed 50% inhibitory concentration value of 12.65 μg/mL in DPPH radical-scavenging assay. Phenolic content was found to be 589.83 mg gallic acid equivalent per 100 g of dried fruits extract. Reducing power was in a concentration-dependent manner, and strongly comparable with the standard ascorbic acid. The extract demonstrated significant inhibition of writhing in acetic acid-induced writhing test at both dose levels (P<0.01). The extract also raised pain threshold in both hot-plate and tail-flick test in a dose-dependent manner, and the results were statistically significant (P<0.01). The extract significantly (P<0.01) increased latent period, and decreased defecation in both castor oil- and magnesium sulfate-induced diarrhea. The extract also decreased gastrointestinal motility in mice. In disk diffusion assay, the extract showed potential antibacterial activity against all the tested bacterial strains.

CONCLUSIONThe results suggest that the ethanol extract of M. seminifera fruit has potential antioxidant, analgesic, antidiarrheal, and antibacterial activities.