scholarly journals Assessment of genotoxicity and cytotoxicity of "lixeira" (Curatella americanaL.) λ using the prophage induction test (SOS inductest)

2009 ◽  
Vol 45 (3) ◽  
pp. 491-496
Author(s):  
Juliana Brandstetter Vilar ◽  
Laryssa Silva de Andrade ◽  
Kaio Ramos Leite ◽  
Heleno Dias Ferreira ◽  
Lee Chen Chen
Keyword(s):  
Folk Medicine ◽  
Ethanolic Extract ◽  
Stem Bark ◽  
Indicator Strain ◽  
Prophage Induction ◽  
E Coli ◽  
Lysogenic Strain ◽  
Genotoxic Potential ◽  
Curatella Americana L ◽  
Curatella Americana

Curatella americana L., commonly known as "lixeira" in Brazil, has been used in folk medicine to treat ulcers and inflammations. The purpose of the present work was to evaluate the cytotoxic and genotoxic potential of the ethanolic extract of C. americana stem bark using the prophage λ induction test (SOS inductest). To evaluate the cytotoxicity of this plant, after treatment with different concentrations of the extract, Escherichia coli WP2s(λ) cultures were diluted in M9 buffer, inoculated into LB plates, and incubated for 24 h at 37 °C. To assess genotoxicity, the lysogenic strain E. coli WP2s(λ) was treated with different concentrations of the extract. Then, the lysogenic strain was added to the indicator strain (RJF013), LB(1/2)(malt/amp), seeded into plates with the matches, and incubated for 24 h at 37 °C. After this period, the total number of colonies and the number of plaques were counted to evaluate C. americana cytotoxicity and genotoxicity, respectively. Our results showed that although the extract of "lixeira" did not modify the survival of bacteria (p > 0.05), it caused a significant increase in prophage λ induction, especially at the higher concentrations (p<0.05). Therefore, we conclude that the ethanolic extract of C. americana stem bark did not present cytotoxic effect, but some genotoxic potential was observed.

Antibacterial Activity of Anthocliesta vogelii (planch) and Tinospora cordifolia/ on Esherichia coli and Pseudomonas aeruginosa

2020 ◽  
Vol 15 (3) ◽  
pp. 50-55
Author(s):  
S.B Adeyemi ◽  
A. I Afonja ◽  
M.B Odebisi-Omokanye ◽  
T.P Okor ◽  
A.A Lateef
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Antibacterial Activity ◽  
Ethanolic Extract ◽  
Stem Bark ◽  
Tinospora Cordifolia ◽  
Phytochemical Analysis ◽  
Root Extract ◽  
E Coli ◽  
Esherichia Coli ◽  
Test Organisms

An ethnobotanical investigation has revealed that the roots of Anthocliesta vogelii and stem bark of Tinospora cordifolia are used by indigenous people in the treatment of pile. This present study evaluated the antibacterial activity of the root and stem bark of Anthocliesta vogelii and Tinospora cordifolia respectively against the human pathogenic gram-negative bacteria Pseudomonas aeruginosa and Escherichia coli. The phytochemical composition of these two plants was also assayed. Graded concentrations of 25mg/ml, 50mg/ml, 100mg/ml and 200mg/ml of the respective crude extract were applied against the test organisms. The percentage yield of the ethanolic extract of T. cordifolia stem and A. vogelii root were 40.978% and 21.872% respectively with their phytochemical analysis revealing the presence of saponins, alkaloids, tannins, flavonoids, and glycosides, with steroids present in A. vogelii but absent in T. cordifolia. The antimicrobial effect of the ethanolic extracts of both plants on the two test bacteria was significant (P<0.05). However, the ethanolic root extract of A. vogelii showed higher inhibition against P. aeruginosa and E. coli than the ethanolic stem extract of T. cordifolia at concentrations of 50mg/ml, 100mg/ml and 200mg/ml, while both extracts did not have any inhibition on the test organisms at a concentration of 25mg/ml. The Minimum Inhibitory Concentrations (MICs) of the ethanolic extract of A. vogelii root on P. aeruginosa and E. coli were 50mg/ml and 100mg/ml respectively, while the MICs for the ethanolic extract of T. cordifolia stem on P. aeruginosa and E. coli was 50mg/ml respectively. Both plant extracts could not kill the test bacteria; hence, they are only bacteriostatic and not bactericidal against the test bacteria. Keywords: Anthocleista vogelii, Tinospora cordifolia, Bacterial, Bacteriostatic, Bactericidal

scholarly journals Temperate bacteriophages of Escherichia coli O119:B14

1970 ◽  
Vol 68 (3) ◽  
pp. 447-455
Author(s):  
S. S. Kasatiya
Keyword(s):  
Escherichia Coli ◽  
Indicator Strain ◽  
Temperate Phage ◽  
Biochemical Reactions ◽  
Serotype A ◽  
E Coli ◽  
Cross Reactions ◽  
Definite Relationship ◽  
Lysogenic Strain ◽  
Flagellar Antigens

SUMMARYLysogeny was detected in 98·8 % of the 343 Escherichia coli O119: B14 strains. A suitable indicator strain E. coli KS was selected to demonstrate the presence of temperate phages in this serotype. A great diversity in the temperate population was observed based on their lytic patterns and neutralization studies. No definite relationship could be established between the biochemical reactions and the flagellar antigens of the lysogenic strain and its temperate phage though some temperate phages released by E. coli O119:B14 strains with certain flagellar antigens did give specific lytic patterns and were serologically identical. Lysogenic strains, which did not release temperate phages spontaneously, were u.v. in-ductible. Cross-reactions with lysogenized colonies which were immune to corresponding phages also confirmed diversity of temperate phages in E. coli O119: B 14.

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 Bioactive constituents with antibacterial, resistance modulation, anti-biofilm formation and efflux pump inhibition properties from Aidia genipiflora stem bark

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Daniel Anokwah ◽  
Evelyn Asante-Kwatia ◽  
Abraham Y. Mensah ◽  
Cynthia Amaning Danquah ◽  
Benjamin K. Harley ◽  
...  
Keyword(s):  
Biofilm Formation ◽  
Efflux Pump ◽  
Ethyl Acetate Fraction ◽  
Stem Bark ◽  
Resistance Mechanisms ◽  
Bioactive Constituents ◽  
Biofilm Inhibition ◽  
E Coli ◽  
Efflux Pump Inhibition ◽  
Oleanonic Acid

Abstract Background Antimicrobial resistance is a global health challenge. The involvement of bacterial biofilms and efflux pumps in the development of multidrug resistance (MDR) is well established. Medicinal plants have been proposed as alternatives for combating MDR focusing on their bioactive constituents with resistance modulatory activities. This study was aimed at investigating the stem bark of Aidia genipiflora for bioactive constituents with anti-biofilm, efflux pump inhibition and resistance modulatory activities. Method The crude methanol extract was purified by column chromatography and isolated compounds characterized by mass and nuclear magnetic resonance spectrometry. Antibacterial activity was determined by the High-throughput spot culture growth inhibition and the broth micro-dilution assay. The ethidium bromide accumulation assay was used to determine efflux pump inhibition property. Biofilm inhibition was determined in a microplate crystal violet retention assay. Results Purification of the ethyl acetate fraction led to the isolation of oleanonic acid (1), 4-hydroxy cinnamic acid docosyl ester (2), β-stigmasterol/β-sitosterol (mixture 3a/b) and D-mannitol (4). The minimum inhibitory concentrations (MICs) ranged from 250 to > 500 μg/mL for extracts and fractions and from 15 to 250 μg/mL for compounds. In the presence of sub-inhibitory concentrations of the compounds, the MIC of amoxicillin against E. coli (20 μg/mL) and P. aeruginosa (320 μg/mL) was reduced by 32 and 10 folds respectively. The whole extract demonstrated anti-biofilm formation and efflux pump inhibition in E. coli, S. aureus and P. aeruginosa. The sterol mixture (3a/b) at concentration of 100 μg/mL caused the highest inhibition (73%) of biofilm formation in S. aureus. Oleanonic acid (1) demonstrated remarkable efflux pump inhibition at MIC of 7.8 μg/mL in E. coli better than the standard drugs verapamil and chlorpromazine. Conclusion This study confirms the prospects of A. genipiflora as a source of new antibacterial agents and adjuvants that could interact with some resistance mechanisms in bacteria to enhance the activity of hitherto ineffective antibiotics. “A small portion of the study has been presented in a conference in the form of poster”.

scholarly journals Phytochemical Analysis, Antioxidant and Anti-Inflammatory Activity of Calyces from Physalis peruviana

2014 ◽  
Vol 9 (11) ◽  
pp. 1934578X1400901 ◽  
Author(s):  
Reina M. Toro ◽  
Diana M. Aragón ◽  
Luis F. Ospina ◽  
Freddy A. Ramos ◽  
Leonardo Castellanos
Keyword(s):  
Antioxidant Activities ◽  
Folk Medicine ◽  
Ethanolic Extract ◽  
Inflammatory Activity ◽  
Phytochemical Analysis ◽  
Physalis Peruviana ◽  
Edema Model ◽  
Anti Inflammatory ◽  
Bio Assay

Physalis peruviana calyces are used extensively in folk medicine. The crude ethanolic extract and some fractions of calyces were evaluated in order to explore antioxidant and anti-inflammatory activities. The anti-inflammatory activity was evaluated by the TPA-induced ear edema model. The antioxidant in vitro activity was measured by means of the superoxide and nitric oxide scavenging activity of the extracts and fractions. The butanolic fraction was found to be promising due to its anti-inflammatory and antioxidant activities. Therefore, a bio-assay guided approach was employed to isolate and identify rutin (1) and nicotoflorin (2) from their NMR spectroscopic and MS data. The identification of rutin in calyces of P. peruviana supports the possible use of this waste material for phytotherapeutic, nutraceutical and cosmetic preparations.

scholarly journals Effect of Ethanolic Extract ofEmbelia Ribeson Dyslipidemia in Diabetic Rats

2002 ◽  
Vol 3 (3) ◽  
pp. 159-162 ◽  
Author(s):  
Uma Bhandari ◽  
Raman Kanojia ◽  
K. K. Pillai
Keyword(s):  
Folk Medicine ◽  
Anthelmintic Activity ◽  
Ethanolic Extract ◽  
Thiobarbituric Acid ◽  
Diabetic Rats ◽  
Herbal Remedies ◽  
Lipid Lowering ◽  
Embelia Ribes ◽  
Liver And Pancreas ◽  
Tbars Values

Diabetes mellitus has been treated orally with herbal remedies based on folk medicine since ancient times.Embelia ribes burm(Myrsinaceae), known commonly as vidanga, was used in Ayurveda for its anthelmintic activity. Ayurveda describes vidanga as pungent, causes increase in digestive fire, and cures flatulence and colic. A single study reported the antihyperglycemic activity of decoction ofE. ribesin glucose-induced hyperglycemic albino rabbits. In the present study, the lipid-lowering and antioxidant potential of ethanolic extract ofE. ribes burmwas investigated in streptozotocin (40 mg/kg, IV, single injection)-induced diabetes in rats. Twenty days of orally feeding the extract (200 mg/kg) to diabetic rats resulted in significant (P< 0.01) decrease in blood glucose, serum total cholesterol, and triglycerides, and increase in HDLcholesterol levels when compared to pathogenic diabetic rats. Further, the extract also lowered the liver and pancreas thiobarbituric acid–reactive substances (TBARSs) values (P< 0.01) when compared to TBARS values of liver and pancreas of pathogenic diabetic rats. The results of test drug were comparable to gliclazide (25 mg/kg, orally), a standard antihyperglycemic agent. This is the first pilot study to provide biochemical evidence of potential ofE. ribesin diabetic dyslipidemia.

scholarly journals A Narrative Review of Libidibia ferrea: Botanical Aspects, Ethnopharmacological Properties, Phytochemical Characteristics, Toxicity, and Experimental Tests

2021 ◽  
pp. 16-30
Author(s):  
Nayanne C. O. da S. Almeida ◽  
Silvania da C. Furtado ◽  
José F. M. Barcellos
Keyword(s):  
Urban Areas ◽  
Folk Medicine ◽  
Experimental Studies ◽  
Experimental Tests ◽  
Stem Bark ◽  
Experimental Models ◽  
Narrative Review ◽  
In Vivo Models ◽  
Methodological Guidelines

Introduction: Jucá or pau-ferro (Libidibia ferrea) is an arboreal plant from the Fabaceae family. It is commonly used in traditional medicine in the treatment of various diseases, including inflammatory process. Aims: The objective of this narrative review is to present botanical aspects, ethnopharmacological properties, phytochemical characteristics, toxicity highlighting, and experimental models with L. ferrea. Results: Botanical Aspects: Jucá has several uses such as in landscaping (stem and canopy), in arborization of urban areas. Ethnopharmacological Properties: It is used in the treatment of various diseases such as diabetes, flu, asthma and, inflammatory processes of which different parts are used (root, stem bark, leaves, fruits, seeds). Phytochemical Characteristics: Phenolic compounds, fatty acids, and terpenoids are among the compounds monthly used. Toxicity: In vivo models have been used to verify toxicity and in most studies the plant presented no toxicity in its use. Experimental studies: Animals, such as mice, dogs, rats, etc. and different models of studies to analyze the action of the plant were used. Conclusions: Such low toxicity, associated with its widespread use in folk medicine and its various effects demonstrated in the studies included in this Review have corroborated for the continuity of the research with L. ferrea. New studies, however, ought to follow methodological guidelines, such as the Animal Research: reporting in vivo Experiments (ARRIVE) so that, a methodological design secures more homogeneous studies capable of quantifying the actual size of the effect in the plant may have in clinical studies.  

scholarly journals SCREENING PHYTOCHEMICAL AND ANTI-METHICILLIN RESISTANT (MRSA) ACTIVITY OF 70 % ETHANOLIC EXTRACT FROM THE STEM BARK OF ALBIZIA LEBBECK(L.) BENTH.(FABACEAE)

2018 ◽  
Vol 6 (6) ◽  
pp. 1-6
Author(s):  
Yao KANGA ◽  
CAMARA Djeneb ◽  
KOUASSI Kouadio Aubin ◽  
ZIRIHI Guédé Noël
Keyword(s):  
Antibacterial Activity ◽  
Reference Strain ◽  
Ethanolic Extract ◽  
Stem Bark ◽  
Drug Resistant ◽  
Albizia Lebbeck ◽  
Antimicrobial Drugs ◽  
Methicillin Resistant ◽  
Resistant Strains ◽  
Drug Resistant Strains

The emergence of multi-drug resistant strains and limitations of present antimicrobial drugs have led to continuous search for natural products as curative agents for Anti-methicillin resistantinfections. The aim of this study was to evaluate antibacterial activity of an ethanolic extract from Albizia lebbeckstem bark against Anti-methicillin resistant. Methods and Results : The methods of dissemination swab on muller-hinton agar and double dilution were used to evaluate the antibacterial activity of 70 % ethanolic extract of stem bark of Albizia lebbeck.All multi-resistant strains of Staphylococcus aureus and the reference strain (ATCC 25923) were sensitive to 70 % ethanolic extract of the stem bark of Albizia lebbeck. The MBCvary from 0,49 mg/mL to 2mg/mL. Also, the phytochemical screening of this extract revealed the presence of  Polyphenols, Gallic tannins, Catechin tanninsand Flavonoids. These findings confirm that an 70 % ethanolic extract from Albizia lebbeck stem bark inhibited growth of Anti-methicillin resistant at low concentration and could be utilised as an alternative Anti-methicillin resistantagent.

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