Potent bactericidal action of a flavonoid fraction isolated from the stem bark of Butea frondosa.
The flavonoid fraction isolated from the ethyl acetate fraction (BF-1) of Butea frondosa (L.) stem bark exhibited distinct antimicrobial activity when tested against 129 bacterial strains belonging to 9 different genera of both gram-positive and gram-negative types. Minimum inhibitory concentration (MIC) of the fraction BF-1 was determined following NCCLS guidelines using the agar dilution method. Twenty-four out of 36 strains of Staphylococcus aureus were inhibited by 50-200 mg/l of the fraction. This fraction also inhibited strains of Bacillus spp., Shigella spp., Salmonella spp. and even a few Pseudomonas at concentrations between 50-200 mg/l. Other bacteria including Escherichia coli, Vibrio cholerae and V. parahaemolyticus were moderately sensitive to BF-1. In the in vivo studies, this fraction offered significant protection to Swiss albino mice at a concentration of 80 microg/mouse (p<0.001) when they were challenged with 50 median lethal dose of Salmonella enteritidis NCTC 74. A fraction named BF-1 that was isolated from an ethyl acetate fraction of Butea frondosa provided protection against an infection from a Salmonella enteritidis NCTC strain.
Mishra
U S
US
Royal College of Pharmacy and Health Sciences, Berhampur, 760002 Orissa, India.
Chakraborty
P
P
Dasgupta
A
A
Dastidar
S G
SG
Martins
M
M
Amaral
L
L
D000818:Animals; D000900:Anti-Bacterial Agents / Q000097:blood / Q000494:pharmacology*; D031290:Butea / Q000737:chemistry*; D005591:Chemical Fractionation; D004195:Disease Models, Animal; D004305:Dose-Response Relationship, Drug; D005419:Flavonoids / Q000097:blood / Q000494:pharmacology*; D006090:Gram-Negative Bacteria / Q000187:drug effects*; D006094:Gram-Positive Bacteria / Q000187:drug effects*; D008136:Longevity / Q000187:drug effects; D008297:Male; D051379:Mice; D008826:Microbial Sensitivity Tests; D024301:Plant Bark / Q000737:chemistry*; D010936:Plant Extracts / Q000494:pharmacology; D012481:Salmonella Infections, Animal / Q000188:drug therapy / Q000517:prevention & control; D013211:Staphylococcus aureus / Q000187:drug effects
D000900:Anti-Bacterial Agents; D005419:Flavonoids; D010936:Plant Extracts