scholarly journals Polarographic Determination and Antimicrobial Activity of Cu(II) Complex with 4-Chlorobenzylidene-4-aminoacetanilide

2012 ◽  
Vol 9 (2) ◽  
pp. 749-755 ◽  
Author(s):  
Riyaz Ahmad Dar ◽  
Krishna Kumar Raj
Keyword(s):  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Electrochemical Method ◽  
Inhibitory Concentration ◽  
Electrochemical Behaviour ◽  
Reduction Process ◽  
Redox Properties ◽  
Single Electron Transfer ◽  
Reversible Reduction

The electrochemical behaviour of the complex of Cu(II) with 4-chlorobenzylidene-4-aminoacetanilide (CAA) was studied. It was observed that CAA forms 1:1 complex with Cu(II) in between pH 6.5 to 7.1. It was found that the reduction process of Cu(II)- CAA complex is two electron reversible reduction process at D.M.E. The logarithm value of stability constant of Cu(II)-4-Chlorobenzylidene-4-aminoacetanilide (CAA) complex has been found to be 4.85.The redox properties of the complex was extensively investigated by electrochemical method using cyclic voltammetry (CV).The Cu(II) complexes exhibited quasi-reversible single electron transfer process.The Schiff base and its complex has been screened for theirin-vitroantibacterial (Escherichiacoli,Staphylococcus aureus,Vibrio choleraeandBacillus subtilis) and antifungal (Aspergillus nigerandPenicillium liliacinum) activities by minimum inhibitory concentration (MIC) method.

Induction of staphylococcal β-lactamase in response to low concentrations of methicillin under simulated diving environments

1977 ◽  
Vol 23 (1) ◽  
pp. 116-121
Author(s):  
James R. Wild
Keyword(s):  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Hydrostatic Pressure ◽  
Minimal Inhibitory Concentration ◽  
Gas Phase ◽  
Inhibitory Concentration ◽  
Hyperbaric Pressure ◽  
Low Concentrations ◽  
Antibiotic Efficacy

The influence of simulated diving environments on the antimicrobial activity of a variety of penicillin and cephalosporin congeners was studied in Staphylococcus aureus. Pressure reduced bacteriostatic action provided the antibiotic was susceptible to β-lactamase hydrolysis and the bacterium was inducible for penicillinase. Ethidium bromide curing of the penicillinase plasmid of an inducible strain eliminated the hyperbaric effect. The minimal inhibitory concentration of benzylpenicillin increased about threefold with increasing hyperbaric pressure from 17 to 136 atm. Additional pressurization to 204 atm did not change antibiotic efficacy further. The efficacy of benzylpenicillin was reduced by 68 atm of hyperbaric helium, nitrogen, or a mixture of neon and helium, but was slightly increased by 68 atm of argon, removal of the gas phase, or 68 atm of hydrostatic pressure. Hyperbaric helium had no effect on β-lactamase activity in vitro. An effect was demonstrated upon induction by suboptimal concentrations of methicillin. The concentration of methicillin required for the induction of half-maximal levels of penicillinase in late log cultures of S. aureus was reduced from 0.15 μg/ml at 1 atm to 0.06 μg/ml at 68 atm. The basis of increased resistance to antibiotics exhibited by S. aureus in hyperbaric environments appears to be enhanced efficiency of penicillinase induction.

scholarly journals Effects of associations of tannins from Anacardium occidentale and Anadenanthera colubrina with cephalosporin against bovine Staphylococcus aureus isolates

2018 ◽  
Vol 85 (0) ◽  
Author(s):  
Andréia Vieira Pereira ◽  
Marcelo Biondaro Góis ◽  
Tatiane Kelly Barbosa Azevêdo ◽  
Fabiana Nabarro Ferraz ◽  
Suellen Laís Vicentino Vieira ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Drug Resistance ◽  
Inhibitory Concentration ◽  
Antibacterial Effect ◽  
Mechanisms Of Action ◽  
Anacardium Occidentale ◽  
Distilled Water ◽  
Conventional Antibiotics

ABSTRACT: The association of natural compounds isolated from medicinal plants with conventional antibiotics, both with similar mechanisms of action, have become a viable alternative strategy to overcome the problem of drug resistance. This study aimed to evaluate the in vitro antimicrobial activity of tannic substances present in the bark of Anacardium occidentale and Anadenanthera colubrina against samples of Staphylococcus aureus when in combination with cephalexin. These combinations were evaluated by determining the minimum inhibitory concentration (MIC). For this purpose, tannins and cephalexin were serially dissolved in distilled water at concentrations ranging from 0.976 mg/mL to 500 mg/mL and 2 mg/mL to 512 mg/mL, respectively. When combined, the compounds inhibited S. aureus growth forming halos ranging from 0.9 to 46 mm with an MIC of 7.8 mg/mL (tannins) and 4 µg/mL (cephalexin). The resulting effect of the combination of natural and synthetic substances with similar mechanisms of action presented better results than when tested alone. Thus, the conclusion is that both the tannins and cephalexin had their antimicrobial action enhanced when used in combination, enabling the use of lower concentrations while maintaining their antibacterial effect against strains of S. aureus.

scholarly journals Antimicrobial and Antihypercholesterolemic Activities of Pulicaria gnaphalodes

Dose-Response ◽  
2020 ◽  
Vol 18 (1) ◽  
pp. 155932582090485 ◽  
Author(s):  
Syed Ali Raza Naqvi ◽  
Syed Muhammad Ali Shah ◽  
Laiba Kanwal ◽  
Muhammad Saeed ◽  
Atta-ul-Haq ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Bacterial Infections ◽  
Inhibitory Concentration ◽  
Methanol Extract ◽  
Ethanol Extract ◽  
Alternative Therapies ◽  
Zone Of Inhibition

Multidrug resistance has increased globally in the communities. Bacterial infections associated with health care have weakened the existing antimicrobial therapy and demand the search for alternative therapies. In the present investigation, the medicinal plant Pulicaria gnaphalodes from Quetta, Pakistan, has been screened for antimicrobial potential. In vitro antimicrobial efficacy of P gnaphalodes extracts (methanol and ethanol) was quantitatively evaluated on the basis of zone of inhibition against different bacteria and minimum inhibitory concentration (MIC). In vivo, antihypercholesterolemic activity is determined in different rat groups. The results of the study indicated that the ethanol extract of P gnaphalodes showed maximum zone of inhibition for Bacillus subtilis of 12.1 ± 1.1 mm from all others. The methanol extract showed maximum zone of inhibition for Staphylococcus aureus of 11.9 ± 1.0 mm and rifampicin showed maximum zone of inhibition of 23.1 ± 0.9 mm. The results of ethanol and methanol extract of P gnaphalodes against different bacteria revealed that this plant has greater antimicrobial activity. However, the plant extract shows nonsignificant antihypercholesterolemic activity. The extract of this plant can be utilized as medicine to inhibit several infections caused by some bacterial pathogens found in human body.

scholarly journals Antimicrobial Activity of the Dichloromethane Extract from in vitro Cultured Roots of Morinda royoc and Its Main Constituents

2010 ◽  
Vol 5 (5) ◽  
pp. 1934578X1000500
Author(s):  
Janetsy Borroto ◽  
Ricardo Salazar ◽  
Alejandro Pérez ◽  
Yemeys Quiros ◽  
Martha Hernandez ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Minimum Inhibitory Concentration ◽  
Inhibitory Concentration ◽  
Bacterial Strains ◽  
Yeast Strains ◽  
Mic Value

The dichloromethane extract and seven anthraquinones isolated from in vitro cultured roots of Morinda royoc L. were tested for their antimicrobial activity against seven yeast and seven bacterial strains. The extract showed a minimum inhibitory concentration (MIC) value of 15.6 μg/m against all species of Candida tested; except C. glabrata (MIC 1.95 μg/mL), and it inhibited the growth of oxacillin-resistant Staphylococcus aureus (MIC 31.2 μg/mL). Only morindone showed activity against all yeast strains (MIC 1.9 μg/mL), and against oxacillin-resistant Staphylococcus aureus (MIC 15 μg/mL).

scholarly journals Synthetic cinnamates as potential antimicrobial agents

2015 ◽  
Vol 69 (1) ◽  
pp. 37-42 ◽  
Author(s):  
Olgica Stefanovic ◽  
Ivana Radojevic ◽  
Ljiljana Comic
Keyword(s):  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Bacillus Subtilis ◽  
Antimicrobial Agents ◽  
Inhibitory Concentration ◽  
Methyl Cinnamate ◽  
Microdilution Method ◽  
Bacillus Subtilis Atcc ◽  
Better Than

This study deals with synthesis of methyl cinnamate, butyl cinnamate, and p-methoxy methyl cinnamate and testing of their in vitro antimicrobial activity. Antimicrobial activity was examined towards 29 microorganisms using microdilution method. It is shown that antimicrobial activity of methyl cinnamate and p-methoxy methyl cinnamate was better than that of butyl cinnamate. Sarcina lutea, Bacillus subtilis ATCC 6633, B. subtilis and B. subtilis IP 5832 (probiotic) were the most sensitive bacteria. It is established that p-methoxy methyl cinnamate can be a new, potential anti-Staphylococcus aureus agent with minimum inhibitory concentration of 62.5 ?g/ml. Methyl cinnamate and p-methoxy methyl cinnamate inhibited the growth of Aspergillus restrictus, A. flavus and A. fumigatus in the concentration range from 62.5 ?g/ml to 250 ?g/ml.

scholarly journals Antibacterial evaluation of some benzimidazole derivatives and their zinc(II) complexes

2007 ◽  
Vol 72 (5) ◽  
pp. 459-466 ◽  
Author(s):  
S.O. Podunavac-Kuzmanovic ◽  
D.M. Cvetkovic
Keyword(s):  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Antibacterial Activity ◽  
Inhibitory Concentration ◽  
Benzimidazole Derivatives ◽  
Gram Negative Bacteria ◽  
Gram Negative ◽  
In Vitro Antibacterial Activity ◽  
Antibacterial Evaluation

Zinc(II) chloride was reacted with some 1-benzylbenzimidazole derivatives (L) to give complexes of the formula ZnL2Cl2. All the ligands and their zinc(II) complexes were evaluated for their in vitro antibacterial activity against Pseudomonas aeruginosa, Bacillus cereus, Staphylococcus aureus and Sarcina lutea. Themajority of the investigated compounds displayed in vitro antimicrobial activity against very persistent microorganisms. It was found that all the tested compounds were more active against gram-positive than gram-negative bacteria. The minimum inhibitory concentration (MIC) was determined for all ligands and their complexes. The effect of the structure of the ligands and complexes on the antimicrobial activity is discussed. The complexes were found to be more toxic than the ligands.

scholarly journals Antimicrobial Metabolites against Methicillin-Resistant Staphylococcus aureus from the Endophytic Fungus Neofusicoccum australe

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 1094
Author(s):  
Melissa M. Cadelis ◽  
Soeren Geese ◽  
Benedict B. Uy ◽  
Daniel R. Mulholland ◽  
Shara J. van de Pas ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Natural Products ◽  
Structure Elucidation ◽  
Methicillin Resistant Staphylococcus Aureus ◽  
Inhibitory Concentration ◽  
Spectroscopic Methods ◽  
Methicillin Resistant ◽  
Bioassay Guided Fractionation ◽  
Antimicrobial Metabolites

Antimicrobial bioassay-guided fractionation of the endophytic fungi Neofusicoccum australe led to the isolation of a new unsymmetrical naphthoquinone dimer, neofusnaphthoquinone B (1), along with four known natural products (2–5). Structure elucidation was conducted by nuclear magnetic resonance (NMR) spectroscopic methods, and the antimicrobial activity of all the natural products was investigated, revealing 1 to be moderately active towards methicillin-resistant Staphylococcus aureus (MRSA) with a minimum inhibitory concentration (MIC) of 16 µg/mL.

scholarly journals Matricaria recutita extract associated with norfloxacin or cephalexin enhances the antimicrobial activity of these drugs against Staphylococcus aureus

Biotemas ◽  
2017 ◽  
Vol 30 (2) ◽  
pp. 25
Author(s):  
Rodrigo Rafael Maia ◽  
Andréia Vieira Pereira ◽  
Marcelo Biondaro Góis ◽  
Karine Delgado Souza ◽  
Vanessa De Melo Cavalcanti-Dantas ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Matricaria Recutita

http://dx.doi.org/10.5007/2175-7925.2017v30n2p25O surgimento de infecções bacterianas, incluindo aquelas associadas com Staphylococcus aureus, traz à tona uma necessidade de buscar novas estratégias mais eficazes para tratamento clínico. O uso de plantas medicinais associados com os antibióticos convencionais pode ser uma opção terapêutica. Atualmente, estudos evidenciam o efeito sinérgico alcançado através da combinação de extratos vegetais com antibióticos. Nosso objetivo foi avaliar a atividade antimicrobiana e cinética bacteriana in vitro do extrato de Matricaria recutita (camomila) e sua associação com cefalexina e norfloxacin sobre isolados clínicos de S. aureus de origem bovina, caracterizada como resistente. Os ensaios foram realizados pelo método da diluição em meio sólido para a determinação da Concentração Inibitória Mínima (CIM). Em ambas as associações do extrato de M. recutita com os antibióticos norfloxacina e cefalexina, foi observada CIM na diluição 1:64 o que correspondeu a 8μg/mL dos antibióticos e 13.43 μg/mL do extrato. A associação Cefalexina com extrato de camomila produziu um efeito sinérgico em 75% das amostras na sua CIM. A combinação com produtos naturais frequentemente utilizados pela população e os antibióticos aqui ensaiados, poderiam representar uma opção terapêutica para o tratamento de infecções causadas por S. aureus, como também para prevenção do desenvolvimento crescente de resistência.

In-Vitro Studies on the Sensitivity of Staphylococcus aureus to Some Ethno-Medicinal Preparations Sold around Kano, Nigeria

2011 ◽  
Vol 4 (1) ◽  
pp. 22-25 ◽  
Author(s):  
M Bashir ◽  
I Yusuf ◽  
AS Kutama
Keyword(s):  
Staphylococcus Aureus ◽  
Antibacterial Activity ◽  
Minimum Inhibitory Concentration ◽  
Inhibitory Concentration ◽  
Test Organism ◽  
Ethanolic Extract ◽  
Screening Tests ◽  
Phytochemical Screening ◽  
Herbal Preparations

Five traditional herbal preparations were sampled between May-June, 2009 in Kano. The samples were investigated for invitro antibacterial activities against clinical isolates of Staphylococcus aureus. Likewise, phytochemical screening tests were conducted to determine some of the phytochemicals present in the ethanolic and water extracts of the samples. Various concentrations of the extracts were prepared using serial doubling dilutions (5000=l/ml, 2500=g/ml, 1250=g/ml, 625=g/ml and 312.5=g/ml). All the test extracts showed slight antibacterial activity against the test organism, with ethanolic extract of sample E having the highest zone diameter of inhibition, while sample H had the lowest diameter of inhibition. The standard antibiotic disc (Gentamicin) had demonstrated the highest activity on the test organisms. The results of the Phytochemical screening revealed the presence of steroid in all the samples, tannin in samples A, C, D and E, reducing sugars in sample A, D and E respectively. The result of the minimum inhibitory concentration (MIC) was found to be above 312.5=g/ml for samples C, D and E. Keywords: Staphylococcus aureus, Herbal preparations, antibacterial activity, Phytochemical screening and minimum inhibitory concentration.

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