In vitro Antibacterial Activity of n-Hexane Fraction of Methanolic Extract of Plumeria rubra L. (Apocynaceae) Stem Bark

2011 ◽  
Vol 6 (3) ◽  
pp. 135-142 ◽  
Author(s):  
Abhijit Dey ◽  
Trisha Das ◽  
Souryadeep Mukherjee
Keyword(s):  
Antibacterial Activity ◽  
Methanolic Extract ◽  
Stem Bark ◽  
Hexane Fraction ◽  
In Vitro Antibacterial Activity ◽  
Plumeria Rubra

Evaluation of Antibacterial Activity of Acer syriacum by Bioautography Method

1970 ◽  
Vol 9 (2) ◽  
pp. 3215-3219
Author(s):  
B. Al Asfour ◽  
R. Al-kayali ◽  
A. Kitaz
Keyword(s):  
Antibacterial Activity ◽  
Methanolic Extract ◽  
Ethyl Acetate Extract ◽  
Diffusion Method ◽  
Klebsiella Pneumonia ◽  
Bacterial Strains ◽  
In Vitro Antibacterial Activity ◽  
Inhibition Zones ◽  
Layer Chromatography

antibacterial activity of leaves, fruits and bark of acer syriacum was evaluated against both negative and positive gram bacterial strains. The powder of above parts were sequentially extracted with aqueous methanol 80%, acetone and petroleumether by maceration. The in vitro antibacterial activity of A. syriacum extracts (in concentration of 200 mg/mL) was performed by agar well diffusion method. Among the tested extracts, leaves methanolic extract has shown the highest growth inhibition. Further, the extract was fractionated, separated by thin layer chromatography (TLC) and submitted to bioautography. the results indicate that the ethyl acetate extract had  the most efficient antibacterial  compounds that displayed inhibition zones (25 mm) against Staphylococcus aureus ATCC25923 and (28mm) against Klebsiella pneumonia ATCC700603. the clear zones were located at RF= 0.15.

scholarly journals In vitro antibacterial activity of extracts of Dalbergia sissoo and Aegle marmelos against Enterotoxigenic Escherichia coli from calves

2021 ◽  
Vol 10 (5) ◽  
pp. 289-293
Author(s):  
Ashok Singh Rathor ◽  
◽  
Taruna Bhati ◽  
AP Singh ◽  
◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Aqueous Extract ◽  
Methanolic Extract ◽  
Enterotoxigenic Escherichia Coli ◽  
Dalbergia Sissoo ◽  
Zone Of Inhibition ◽  
Aegle Marmelos ◽  
E Coli ◽  
In Vitro Antibacterial Activity

Neonatal calf diarrhoea (NCD) is the most common cause of morbidity and mortality in pre-weaned dairy calves, causing huge economic and productivity losses to dairy industry worldwide. Enterotoxigenic E. coli (ETEC) is one of the important causes of neonatal diarrhoea and high mortality in very young calves. Shisham (Dalbergia sissoo) leaves and Bael (Aegle marmelous) unripe fruit have been used in diarrhoea and dysentery with very good results. Hence the present study was conducted to evaluate the in vitro antibacterial activity of the aqueous and methanolic extract of Dalbergia sissoo and Aegle marmelos against 16 E. coli isolated from colibacillosis affected diarrhoeic calves in Bikaner district of Rajasthan. The average zones of inhibitions of aqueous extract of Aegle marmelos and methanolic extract of Dalbergia sissoo against E. coli were 23.75±0.34 mm, 18.75±0.32 mm, 16.5±0.24 mm, 11.58 ±0.14 mm and 7.88±0.24 mm at concentrations of 1000 mg/ml, 500 mg/ml, 250 mg/ml 125 mg/ml and 62.5 mg/ml, respectively. The average zones of inhibition of aqueous extract of Dalbergia sissoo and methanolic extract of Aegle marmelos against E. coli were 24.75±0.20 mm, 19.87±0.34 mm, 17.25±0.24mm, 12.86±0.13 mm and 8.50±0.14 mm at concentrations of 1000 mg/ml, 500 mg/ml, 250 mg/ml 125 mg/ml and 62.5 mg/ml, respectively. The maximum zone of inhibition was reported by aqueous extract of Dalbergia sissoo and methanolic extract of Aegle marmelos (>24 mm of diameter) at concentration of 1000 mg/ml. Based on average zone of inhibition, the in vitro antibacterial activity of aqueous extract of Dalbergia sissoo and methanolic extract of Aegle marmelos was found to be more against E. coli as compared to aqueous extract of Aegle marmelos and methanolic extract of Dalbergia sissoo at varying concentrations. In conclusion, both combination of aqueous and methanolic extract of Dalbergia sissoo and Aegle marmelos showed in vitro antibacterial properties against E. coli

In Vitro Antibacterial activity of ethanolic extract of Myrsine africana against laboratory Strains of Pathogenic Organisms

2016 ◽  
Vol 5 (04) ◽  
pp. 4512
Author(s):  
Jackie K. Obey ◽  
Anthoney Swamy T* ◽  
Lasiti Timothy ◽  
Makani Rachel
Keyword(s):  
Antibacterial Activity ◽  
Minimum Inhibitory Concentration ◽  
Inhibitory Concentration ◽  
Ethanolic Extract ◽  
Ethanol Extract ◽  
E Coli ◽  
Zones Of Inhibition ◽  
In Vitro Antibacterial Activity ◽  
Myrsine Africana

The determination of the antibacterial activity (zone of inhibition) and minimum inhibitory concentration of medicinal plants a crucial step in drug development. In this study, the antibacterial activity and minimum inhibitory concentration of the ethanol extract of Myrsine africana were determined for Escherichia coli, Bacillus cereus, Staphylococcus epidermidis and Streptococcus pneumoniae. The zones of inhibition (mm±S.E) of 500mg/ml of M. africana ethanol extract were 22.00± 0.00 for E. coli,20.33 ±0.33 for B. cereus,25.00± 0.00 for S. epidermidis and 18. 17±0.17 for S. pneumoniae. The minimum inhibitory concentration(MIC) is the minimum dose required to inhibit growth a microorganism. Upon further double dilution of the 500mg/ml of M. africana extract, MIC was obtained for each organism. The MIC for E. coli, B. cereus, S. epidermidis and S. pneumoniae were 7.81mg/ml, 7.81mg/ml, 15.63mg/ml and 15.63mg/ml respectively. Crude extracts are considered active when they inhibit microorganisms with zones of inhibition of 8mm and above. Therefore, this study has shown that the ethanol extract of M. africana can control the growth of the four organisms tested.

scholarly journals Evaluation of the in vitro antibacterial activity of some essential oils and their blends against Staphylococcus spp. isolated from episodes of sheep mastitis

2021 ◽  
Author(s):  
Filippo Fratini ◽  
Margherita Giusti ◽  
Simone Mancini ◽  
Francesca Pisseri ◽  
Basma Najar ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Essential Oils ◽  
Diffusion Method ◽  
Minimal Bactericidal Concentration ◽  
Coagulase Negative Staphylococci ◽  
Disk Diffusion Method ◽  
In Vitro Antibacterial Activity ◽  
High Concentrations ◽  
Thymus Serpyllum

AbstractStaphylococcus aureus and coagulase-negative staphylococci are among the major causes of mastitis in sheep. The main goal of this research was to determine the in vitro antibacterial activity of several essential oils (EOs, n 30), then five of them were chosen and tested alone and in blends against staphylococci isolates. Five bacteria were isolated from episodes of ovine mastitis (two S. aureus and three S. xylosus). Biochemical and molecular methods were employed to identify the isolates and disk diffusion method was performed to determine their antimicrobial-resistance profile. The relative percentage of the main constituents in the tested essential oils and their blends was detected by GC-EIMS analysis. Antibacterial and bactericidal effectiveness of essential oils and blends were evaluated through minimal inhibitory concentration (MIC) and minimal bactericidal concentration (MBC). All of them showed sensitivity to the used antimicrobials. The EOs with the highest antibacterial activity were those belonging to the Lamiaceae family characterized by high concentrations of thymol, carvacrol and its precursor p-cymene, together with cinnamon EO, rich in cinnamaldehyde. In terms of both MIC and MBC values, the blend composed by Thymus capitatus EO 40%, Cinnamomum zeylanicum EO 20%, Thymus serpyllum EO 20% and Satureja montana EO 20% was found to be the most effective against all the isolates. Some essential oils appear to represent, at least in vitro, a valid tool against ovine mastitis pathogens. Some blends showed a remarkable effectiveness than the single oils, highlighting a synergistic effect in relation to the phytocomplex.

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