scholarly journals Synthesis and Antimicrobial Activity of Some [1,2,4]-Triazole Derivatives

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Bhimagouda S. Patil ◽  
G. Krishnamurthy ◽  
N. D. Shashikumar ◽  
M. R. Lokesh ◽  
H. S. Bhojya Naik
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Antimicrobial Activity ◽  
Triazole Derivatives ◽  
H Nmr ◽  
Chemical Structures ◽  
C Nmr

A series of novel [1,2,4]-triazolo piperidine (8), [1,2,4]-triazolo piperazine (9a-c), [1,2,4]-triazolo phenylether (10a-e), and [1,2,4]-triazolo aniline (11a-c) derivatives have been synthesized. The chemical structures of the newly synthesized compounds were characterized by IR,1H NMR,13C NMR, and LCMS. The newly synthesized compounds were screened for antimicrobial activity. Among all the compounds tested,11b(R4=4-MeO–) showed the highest activity againstStaphylococcus aureusandEscherichia coli, and9a(R1andR2=Cl) showed the highest activity againstPseudomonas aeruginosa.

scholarly journals Two New Sulfated Sterols from the Marine Sponge Lendenfeldia dendyi

2007 ◽  
Vol 2 (9) ◽  
pp. 1934578X0700200 ◽  
Author(s):  
Mohamed M. Radwan ◽  
Susan P. Manly ◽  
Samir A. Ross
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Antimicrobial Activity ◽  
Sodium Sulfate ◽  
Spectroscopic Data ◽  
Methicillin Resistant Staphylococcus Aureus ◽  
Mycobacterium Intracellulare ◽  
Sulfated Steroids ◽  
C Nmr

Two new sulfated steroids, 3β, 5α, 6β- trihydroxy-24-methylene-cholesta-7-ene-3-sodium sulfate (1) and 3β, 5α, 6β-trihydroxy-23 E-24-methyl-cholesta-7,23-diene-3-sodium sulfate (2) have been isolated from the sponge, Lendenfeldia dendyi. Their structures were determined on the basis of extensive spectroscopic data (IR, HRMS, 1H and 13C NMR, HMQC, HMBC, COSY and ROESY). The two metabolites lacked antimicrobial activity against Candida albicans, Escherichia coli, Pseudomonas aeruginosa, Cryptococcus neoformans, Mycobacterium intracellulare, Aspergillus fumigatus, and methicillin-resistant Staphylococcus aureus (MRSa).

scholarly journals Photoinduced Synthesis of New Diisochromenochromen-4-ones and Their Antimicrobial Activities

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Mohamad Yusuf ◽  
Indu Solanki ◽  
Payal Jain
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Antimicrobial Activities ◽  
Significant Activity ◽  
Rigorous Analysis ◽  
H Nmr ◽  
Antibacterial And Antifungal Activities ◽  
Antibacterial And Antifungal ◽  
C Nmr

The diisochromenochromen-4-one3a-3b,4a-4c,5a-6a  & 7have been prepared from the photocyclization reaction of bischromen-4-one2a-2e. The later compounds are obtained from the O-alkylation of the suitable 3-hydroxy-2-aryl-4H-chromen-4-one1a-1ewith 4,4′-bischloromethyl-diphenyl in dry acetone, anhydrous K2CO3, and PTC (Bu4N+I−) under refluxing conditions. The structures of compounds2a-2e,3a-3b,4a-4c,5a-6a  & 7have been characterized from the rigorous analysis of their IR,1H-NMR,13C-NMR, ESI-Mass, and elemental analysis. The antibacterial and antifungal activities of the synthesized products were also evaluated against theKlebsiella pneumoniae, Pseudomonas aeruginosa, Escherichia coli, Staphylococcus aureus, Bacillus subtilis, andAspergillus janusandPenicillium glabrum, respectively. Some of the tested compounds showed significant activity against the above-said microorganisms.

scholarly journals Synthesis and Antimicrobial Activity of Coumarinyl Schiff Base Derivatives

2014 ◽  
Vol 30 ◽  
pp. 193-201 ◽  
Author(s):  
Arun Mishra ◽  
Jaynt Rathod ◽  
Dipti Namera ◽  
Shailesh Thakrar ◽  
Anamik Shah
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Gram Negative ◽  
H Nmr ◽  
Schiff Base Derivatives ◽  
Test Organisms ◽  
Ft Ir ◽  
C Nmr

We have reported some novel N’-[(1)-ethylidene]-2-(6-methyl-2-oxo-2H-chromen-4-yl) acetohydrazide synthesized by conventional method. The reaction of 2-(6-methyl-2-oxo-2H-chromen-4-yl)acetohydrazide with substituted benzaldehyde in methanol as a solvent yielded a series of (7a-l). The structures of all synthesized compounds are well characterized by Mass, FT-IR, 1H NMR, 13C NMR and elemental analysis. Moreover, all synthesized compounds were screened for In Vitro antimicrobial activity against the gram positive (Staphylococcus aureus, Bacilluas subtilis) and gram negative (Escherichia coli, P. aeruginosa, K. pneunonae, Enterobacter) bacterial strain. In which some the compounds show potential inhibition against the test organisms.

scholarly journals Characterization and antimicrobial activity of vaginal lactobacillus isolate

2011 ◽  
Vol 63 (1) ◽  
pp. 29-35 ◽  
Author(s):  
Gordana Zavisic ◽  
Zeljka Radulovic ◽  
Valentina Vranic ◽  
Jelena Begovic ◽  
L. Topisirovic ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Antimicrobial Activity ◽  
Survival Rate ◽  
Bile Salts ◽  
Antimicrobial Effect ◽  
Low Ph ◽  
Probiotic Potential ◽  
Pathogenic Escherichia Coli

The aim of this study was to investigate the probiotic potential of bacteriocin-producing lactobacilli strain Lactobacillus plantarum G2 isolated from the vaginal mucus of healthy women. The antimicrobial effect of G2 was confirmed in the mixed culture with pathogenic Escherichia coli, Staphylococcus aureus, Salmonella abony and Pseudomonas aeruginosa, while bacteriocine activity was detected against S. aureus and S. abony only. The strain showed an excellent survival rate in low pH and in the presence of bile salts. The percentage of adhered cells of L. plantarum G2 to hexadecane was 63.85?2.0 indicating the intermediate hydrophobicity.

scholarly journals Antimicrobial Activity of Cultivable Endophytic and Rhizosphere Fungi Associated with “Mile-a-Minute,” Mikania cordata (Asteraceae)

2020 ◽  
Vol 2020 ◽  
pp. 1-7 ◽  
Author(s):  
Pavithra L. Jayatilake ◽  
Helani Munasinghe
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Antimicrobial Activity ◽  
Antimicrobial Properties ◽  
Pharmaceutical Products ◽  
Diffusion Method ◽  
Molecular Characteristics ◽  
Disk Diffusion Method ◽  
Rhizosphere Fungi

Endophytic and rhizosphere fungi are understood to be aiding the host plant to overcome a range of biotic and abiotic stresses (nutrition depletion, droughts, etc.) hence, they remain to be reservoirs of plethora of natural products with immense use. Consequently, this investigation of endophytic and rhizosphere fungi isolated from Mikania cordata (a perennial vine that is well established in Sri Lanka) for their antimicrobial properties was performed with the aim of future derivation of potential beneficial pharmaceutical products. Leaves, twigs, and roots of M. cordata were utilized to isolate a total of 9 endophytic fungi out of which the highest amount (44%) accounted was from the twigs. A sample of the immediate layer of soil adhering to the root of M. cordata was utilized to isolate 15 rhizosphere fungi. Fusarium equiseti and Phoma medicaginis were endophytes that were identified based on colony and molecular characteristics. The broad spectrum of antimicrobial activity depicted by F. equiseti (MK517551) was found to be significantly greater (p≤0.05, inhibitory against Bacillus cereus ATCC 11778, Staphylococcus aureus ATCC 25923, Escherichia coli ATCC 25922, and Pseudomonas aeruginosa ATCC 25853) than P. medicaginis (MK517550) (inhibitory against Staphylococcus aureus ATCC 25923, Escherichia coli ATCC 25922, and Pseudomonas aeruginosa ATCC 25853) as assessed using the Kirby-Bauer disk diffusion method. Trichoderma virens and Trichoderma asperellum were rhizospere fungi that exhibited remarkable antimicrobial properties against the test pathogens chosen for the study. T. asperellum indicated significantly greater bioactivity against all four bacterial pathogens and Candida albicans ATCC 10231 under study. The ranges of minimum inhibitory concentrations (MICs) of the fungi depicting antimicrobial properties were determined. The results obtained suggest that F. equiseti, P. medicaginis, T. asperellum, and T. virens of M. cordata harness bioprospective values as natural drug candidates. This is the first report on isolation and evaluation of the antimicrobial properties of endophytic and rhizosphere fungi of Mikania cordata.

scholarly journals Spatial Structure and Antimicrobial Activity of Cyclopropane Derivative of Limonene

2018 ◽  
Vol 13 (4) ◽  
pp. 1934578X1801300
Author(s):  
Daniyar Sadyrbekov ◽  
Timur Saliev ◽  
Yuri Gatilov ◽  
Ivan Kulakov ◽  
Roza Seidakhmetova ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Antimicrobial Activity ◽  
Bacillus Subtilis ◽  
Spatial Structure ◽  
Bacterial Strains ◽  
Gram Negative ◽  
X Ray ◽  
Cyclopropane Derivative

A cyclopropane derivative of limonene, (1 S, 4 S, 6 R)-7,7-dichloro-4-[(1 S)-2,2-dichloro-1-methylcyclopropyl]-1-methylbicyclo [4.1.0] heptane (compound 2), was synthesized and its structure was determined by NMR and X-ray crystallographic methods. In addition, an antimicrobial activity of the compound against Gram-positive ( Staphylococcus aureus, Bacillus subtilis) and Gram-negative ( Escherichia coli, Pseudomonas aeruginosa) bacterial strains was also scrutinized.

scholarly journals Complexations of 2-thiouracil and 2,4-dithiouracil with Cd(SeCN)2and Hg(SeCN)2: NMR and anti-bacterial activity studies

2011 ◽  
Vol 25 (3-4) ◽  
pp. 187-195 ◽  
Author(s):  
M. Nasiruzzaman Shaikh ◽  
Bassem A. Al-Maythalony ◽  
Mohammed I. M. Wazeer ◽  
Anvarhusein A. Isab
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Solid State ◽  
Salmonella Typhi ◽  
Bacterial Activity ◽  
Spectroscopic Techniques ◽  
Standard Type ◽  
Nmr Data ◽  
C Nmr

Cadmium and mercury selenocyanate complexes of 2-thiouracil (TU) and 2,4-dithiouracil (DTU) ligands have been synthesized to form complexes of the type [M(SeCN)2(TU)] and [M(SeCN)2(DTU)] (where M is Cd2+or Hg2+) and studied by various spectroscopic techniques such as IR,1H and13C NMR in solution and in the solid state for13C,15N, and113Cd nuclei. Based on IR, and solution and solid-state13C NMR data, stronger cadmium bonding to the thiouracil was observed compared to that of mercury. Anti-bacterial activities of these complexes have been investigated with standard type culture ofEscherichia coli(MTCC 443),Klebsiella pneumoniae(MTCC 109),Pseudomonas aeruginosa(MTCC 1688),Salmonella typhi(MTCC 733) andStaphylococcus aureus(MTCC 737) and show that ligands exhibit more anti-bacterial activities than that of the corresponding Cd(II) and Hg(II) complexes.

scholarly journals Antimicrobial activity of soft and purified propolis extracts

Medicina ◽  
2008 ◽  
Vol 44 (12) ◽  
pp. 977 ◽  
Author(s):  
Alvydas Pavilonis ◽  
Algirdas Baranauskas ◽  
Ligita Puidokaitė ◽  
Žaneta Maželienė ◽  
Arūnas Savickas ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Antimicrobial Activity ◽  
Bacillus Subtilis ◽  
Candida Albicans ◽  
Phenolic Compounds ◽  
Klebsiella Pneumoniae ◽  
Gram Negative ◽  
Propolis Extract

Objective. To evaluate the antimicrobial activity of soft and purified propolis extracts. Study object and methods. Antimicrobial activity of soft and purified propolis extracts was determined with reference cultures of Staphylococcus aureus ATCC 25923, Enterococcus faecalis ATCC 29212, Escherichia coli ATCC 25922, Klebsiella pneumoniae ATCC 33499, Pseudomonas aeruginosa ATCC 27853, Proteus mirabilis ATCC 12459, Bacillus subtilis ATCC 6633, Bacillus cereus ATCC 8035, and fungus Candida albicans ATCC 60193. Microbiological tests were performed under aseptic conditions. Minimum inhibitory concentration (MIC) – the highest dilution of preparation (the lowest concentration of preparation) that suppresses growth of reference microorganisms – was determined. Results. Concentration of phenolic compounds in soft propolis extract that possesses antimicrobial activity against gram-positive (Staphylococcus aureus, Enterococcus faecalis) and gram-negative bacteria (Escherichia coli, Pseudomonas aeruginosa, and Proteus mirabilis) is 0.587±0.054 mg and 0.587±0.054–0.394±0.022 mg (P>0.05) and in purified propolis extract – 0.427±0.044 mg and 0.256±0.02 mg (P>0.05). Klebsiella pneumoniae is most resistant to soft propolis extract when the concentration of phenolic compounds is 1.119± 0.152 mg and to purified propolis extract when the concentration of phenolic compounds is 1.013±0.189 mg (P>0.05). Spore-forming Bacillus subtilis bacteria are more sensitive to soft and purified propolis extracts when the concentration of phenolic compounds is 0.134±0.002 mg and 0.075±0.025 mg, respectively, and Bacillus cereus – when the concentration is 0.394±0.022 mg and 0.256±0.02 mg (P>0.05). Sensitivity of fungus Candida albicans to soft and purified propolis extracts is the same as Bacillus subtilis. Encapsulated bacterium Klebsiella pneumoniae is most resistant to antimicrobial action of soft and purified propolis extracts as compared with gram-positive Staphylococcus aureus and Enterococcus faecalis bacteria (P<0.05), gram-negative Escherichia coli, Pseudomonas aeruginosa, and Proteus mirabilis (P<0.05), sporeforming Bacillus subtilis and Bacillus cereus bacteria (P<0.05), and fungus Candida albicans (P<0.05). There is no statistically significant difference between antimicrobial effect of soft propolis extract and purified propolis extract on gram-positive bacteria, gram-negative bacteria, spore-forming bacteria, encapsulated bacteria, and Candida fungus. Conclusions. Soft and purified propolis extracts possess antimicrobial activity. They could be recommended as natural preservatives in the manufacture of pharmaceutical products.

scholarly journals Antimicrobial activity of isolated compounds and semisynthetic derivatives from Miconia ferruginata

2020 ◽  
Vol 4 (1) ◽  
pp. 49
Author(s):  
Gracielle Oliveira Sabbag Cunha ◽  
Ana Paula Terezan ◽  
Andreia Pereira Matos ◽  
Marcela Carmen De Melo Burger ◽  
Paulo Cezar Vieira ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Antimicrobial Activity ◽  
Methyl Esters ◽  
Carboxyl Group ◽  
Isomeric Mixture ◽  
E Coli ◽  
Bacillus Subtilis Atcc ◽  
Derivatives Of

This study evaluated the antimicrobial activity of isolated compounds and semisynthetic derivatives from Miconia ferruginata (Melastomataceae) against five microorganisms: Staphylococcus aureus (ATCC 25923), Escherichia coli (ATCC 25922), Bacillus subtilis (ATCC 6623), Pseudomonas aeruginosa (ATCC 15442), and Candida albicans (ATCC 10231). The isomeric mixture of ursolic and oleanolic acids was active against S. aureus (MIC = 250 μg mL-1) and against E. coli, B. subtilis, and P. aeruginosa (MIC = 500 μg mL-1). The flavone 5,6,7-trihydroxy-4’-methoxyflavone and the methyl esters, semisynthetic derivatives of a mixture of ursolic and oleanolic acids, showed no activity against the tested microorganisms. These results suggest that the carboxyl group present in the triterpenes may contribute to antimicrobial activity.

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