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1
Content available remote Microstructural, antifungal and photocatalytic activity of NiO–ZnO nanocomposite
Wang Yixuan, Balakrishnan G.
Materials Science Poland
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2024
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Vol. 42, No. 1
107--115
EN
In this work, NiO–ZnOnanocomposite (NC)was prepared through a facile, low-temperature,sol–gel route. Zinc acetate dihydrate, nickel chloride hexahydrate, cetyltrimethyl ammonium bromide (CTAB), and citric acid were used in the synthesis of the material. Then, the sample was kept in the muffle furnace at a temperature of 600°C for 2 h. X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM), UV–Visible spectroscopy, and photocatalytic and antifungal investigations were used to characterize the synthesized nanocrystallites. The XRD data showedthe polycrystalline hexagonal ZnO nanoparticles and cubic NiO crystallites. FTIR studies confirmed the presence of Zn-O and Ni-O bonds in the sample. The FESEM analysis showed the morphology of nanocrystallitescharacterized by their homogeneous shape and size. The absorbance curves from the UV–Visible spectroscopy investigation revealed the bandgap of 3.17 eV. The research findings demonstrate that the NiO–ZnO NC possesses the significant level of selected microbial pathogens. Industrial dyesmake water unhealthy for drinking. Among these dyes, methylene blue (MB) is toxic, carcinogenic, and non-biodegradable, and causes a severe threat to human health and environmental safety. Hence, it is necessary to develop efficient and environmentally friendly technology to remove MB from wastewater. The ZnO–NiO NC degraded the MB dye pollutant under visible irradiation (125 W), according to photocatalytic tests. After 120 min of exposure, the photocatalytic investigations demonstrated 75% degradation efficiency.
2
Content available remote Aktywność ozonowanej oliwy z oliwek przy zwalczaniu drobnoustrojów
Nocuń M., Krzyściak P., Niedźwiedzka E., Niedźwiedzki J., Krzyściak-Kosińska R.
Materiały Ceramiczne
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2018
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T. 70, nr 4
356--370
PL
Ozonowana oliwa z oliwek wspomaga gojenie się ran i wykazuje działanie przeciwdrobnoustrojowe. Oceniono skuteczność ozonowanej oliwy z oliwek z własnej syntezy przeciwko zwykłym bakteriom (Staphylococcus aureus, Escherichia coli, Klebisella pneumoniae i Pseudomonas aeruginosa) oraz grzybom (Candida albicans, Malassezia globosa, Aspergillus niger, Aspergillus fumigatus i Trichophyton mentagrophytes). Do oceny aktywności przeciwdrobnoustrojowej wykorzystano zarówno metodę mikrorozcieńczeń, jak i mikrodyfuzję w agarze. Minimalne stężenia ozonowanej oliwy z oliwek, które hamowały wzrost wszystkich badanych bakterii i grzybów, wynosiły odpowiednio 0,8% i 3,12%. Badania cytotoksyczności z użyciem mysich fibroblastów zarodkowych wskazują, że ozonowana oliwa z oliwek ma niski efekt cytopatyczny do stężenia 6,25%. Ozonowane oleje roślinne wykazują dobrą skuteczność przeciwdrobnoustrojową i niską cytotoksyczność. Konieczne jest jednak opracowanie standardowej metodologii umożliwiającej międzylaboratoryjne porównywanie wyników.
EN
Ozonized olive oil supports healing wounds and shows antimicrobial action. The efficacy of self-produced ozonized olive oil against common bacteria (Staphylococcus aureus, Escherichia coli, Klebisella pneumoniae, and Pseudomonas aeruginosa) and fungi (Candida albicans, Malassezia globosa, Aspergillus niger, Aspergillus fumigatus and Trichophyton mentagrophytes) were evaluated. Both microdilution and diffusion in agar methods were used to assess antimicrobial activity. The minimal concentrations of ozonized olive oil that inhibited all tested bacteria and fungi were 0.8% and 3.12%, respectively. Cytotoxicity studies using murine fibroblasts indicate that ozonized olive oil has a low cytopathic effect up to a concentration of 6.25%. Ozonized vegetable oils have good antimicrobial efficacy and low cytotoxicity. However, it is necessary to develop a standard methodology for interlaboratory comparison of results.
3
Content available Bioactive peptides from meat industry by-products as potential antimicrobial agents based on BIOPEP-UWM database
Kęska P., Stadnik J., Kononiuk A., Libera J., Wójciak K. M.
Biotechnology and Food Science
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2018
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Vol. 82, nr 2
75--84
EN
New peptides with potential antimicrobial activity, encrypted in protein sequences of meat industry by-products were searched with bioinformatics tools using BIOPEP-UWM database. The potential of major proteins as a source of biologically active peptides with antibacterial, antiviral and antifungal activity were considered. As a result, collagen, hemoglobin, fibrinogen and selected meat tissue proteins (creatine kinase, myosin, titin) has been shown to contain short motifs responsible for antibacterial properties. The peptides with antiviral and antifungal properties were not detected.
4
Content available Wpływ wybranych fenolokwasów na szczepy grzybów pleśniowych
Dec D.
Postępy Techniki Przetwórstwa Spożywczego
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2016
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Nr 2
80--82
PL
Celem badań zaprezentowanych w artykule była ocena działania substancji fenolowych występujących powszechnie w roślinach na wybrane szczepy grzybów pleśniowych z punktu widzenia poznawczego oraz ewentualnego zastosowania w praktyce w przemyśle spożywczym. Materiałem badawczym były szczepy Aspergillusa, na których sprawdzano wpływ wybranych fenolokwasów.
EN
The aim of this study was to evaluate the effect of phenolic substances commonly found in plants selected strains of fungi from the point of view of the cognitive and the possible practical application in the food industry. The research material were strains of Aspergillus, which tested the effect of some phenolic acids.
5
Content available Synthesis and in vitro antibacterial and antifungal evaluation of quinoline analogue azetidin and thiazolidin derivatives
Prajapati S. M, Vekariya R. H., Patel K. D., Panchal S. N., Patel H. D., Rajani D. P., Rajani S.
International Letters of Chemistry, Physics and Astronomy
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2014
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Vol. 20, iss. 2
195--210
EN
A library of quinoline analog two novel series of azetidin (SH1-5) and thiazolidin (SHa-e) derivatives were designed and synthesized with simple and eco-friendly methodologies. The structures of the compounds were elucidated with the aid of elemental analysis, IR, 1H-NMR and mass spectral data. These novel synthesized compounds were evaluated for antibacterial activity against two gram-positive bacteria (Staphylococcus aureus, Staphylococcus pyogenus) and two gram-negative bacteria (Pseudomonas aeruginosa, Escherichia coli). The title compounds were also studied for their antifungal activity with Candida albicans, Aspergillus niger, Aspergillus clavatus using the broth dilution technique. Most of the compounds were the best bio-active desired antibacterial analog with less MIC value against different tested strains.
6
Content available Synthesis and characterization of 1,3,5-trisubstituted pyrazoline derivatives by ultrasonic irradiation method and evaluation of its antibacterial activity
Raguraman A., Santhi N.
International Letters of Chemistry, Physics and Astronomy
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2014
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Vol. 20, iss. 2
219--233
EN
A series of novel 1,3,5-trisubstituted pyrazoline derivatives (P1-P10) have been synthesized by the reaction of substituted chalcones (C1-C10) with 4-hydroxybenzhydrazide. The starting material, chalcones were prepared by claisen Schmidt condensation of 4-methylacetophenone with substituted aldehydes in the presence of sodium hydroxide in ethanol. 4-hydroxybenzhydrazide was synthesized by condensing methyl 4-hydroxybenzoate with hydrazine hydrate. The cycloaddition of chalcones with 4-hydroxybenzhydrazide gives 1, 3, 5-trisubstituted pyrazoline derivatives. The structures of synthesized derivatives were confirmed by IR, 1HNMR and 13C NMR spectrum. The synthesized compounds were screened for their antibacterial and antifungal activity.
7
Content available An efficient solid phase one port synthesis of Novel triazolo[1,5-a]pyrimidine derivatives from 4-(4-aminophenyl)morpholin-3-one and evaluation of their antimicrobial activity
Prajapati D. R., Vilapara K. V., Naliapara Y. T.
International Letters of Chemistry, Physics and Astronomy
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2014
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Vol. 14, iss. 1
12--21
EN
A series of novel triazolo[1,5-a]pyrimidine derivatives was synthesized from 5-amino-1,2,4-triazole and biologically active morpholinone amine in excellent yield as promising class of antimicrobial agents. The antimicrobial activities were investigated against Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, Staphylococcus pyogen, Candida albicans, Aspergillusniger, Aspergillusclavatus and compared with standard drugs Ampicillin, Chloramphenicol, Norfloxacin and Griseofulvin. All the synthesized compounds were characterized by IR, 1H NMR, 13C and mass spectroscopy. The result of antimicrobial activity data revealed that compound 4f,4g and 4i were found more active against bacterial species and compound 4c, 4d, 4g, 4i and 4jwere found more active against fungal strain, while other compounds shows moderate to law activity against microbes.
8
Content available Synthesis, Spectral Characterization and Biological Studies of Lanthanum(III) Complexes with 3-Substituted-4-Amino-5-Mercapo-1,4-Triazoles Schiff Bases
Yadawe M. S., Unki S. N., Patil S. A.
International Letters of Chemistry, Physics and Astronomy
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2013
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Vol. 12
94--104
EN
Some lanthanum(III) complexes have been synthesized by reacting lanthanum(III) metal salt with Schiff bases derived from 3-substituted-4-amino-5-mercapto-1,2,4-triazole and glyoxal/ biacetyl/ benzyl. All these complexes are not soluble in common organic solvents. However sparingly soluble in DMF and DMSO. The chemical analysis of the complexes confirmed to the stoichiometry of the type La(III)LNO3•H2O. La(III)LCl•H2O and La(III)LNCS•H2O respectively. The chelation of the complexes has been proposed in the light of analytical, spectral studies. The measured molar conductance values indicate that, the complexes are non-electrolytes. The Schiff bases and their complexes have been screened for their antibacterial and antifungal activities. The results of these studies show the metal complexes to be more antibacterial and antifungal as compared to the uncomplexed coumarins. lanthanum(III) complexes.
9
Thermal, Spectral, magnetic and Biological studies of Thiosemicarbazones Complexes with Metal Ions: Cu(II), Co(II), Ni(II), Fe(III), Cd(II), Zn(II), MN(II) and UO2(VI)
Mashaly M., Seleem H., El-Behairy M., Habib H.
Polish Journal of Chemistry
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2004
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Vol.78 /nr 11-12
2055-2074
EN
Thiosemicarbazones ligands, isatin-3-thiosemicarbazone (HIT) and N-acetylisatin-3- thiosemicarbazone (HAIT), which have tridentate ONN coordinating sites were prepared. The complexes of both ligands with Cu(II), Co(II), Ni(II), Fe(III), Cd(II), Zn(II), Mn(II) and UO2(VI) ions were isolated. The ligands and their metal complexes were characterized by elemental analyses, IR, UV-Vis and mass spectra, also by conductance, magnetic moment and TG-DSC measurements. All the transition metal complexes have octahedral configurations, except Cu-complexes, which were found to have the squareplanar geometry and theUO2(VI) complexes which have coordination number 8 and may acquire the distorted dodecahedral geometry. Thermal studies explored the possibility of obtaining new complexes. Inversion from octahedral to square-planar configuration occurred upon heating the parent Ni-HAIT complex to form the corresponding pyrolytic product. The antifungal activity against the tested organisms showed that some metal complexes enhanced the activity with respect to the parent ligands.
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