scholarly journals Synthesis and characterizations iron oxide carbon nanotubes nanocomposite by laser ablation for anti-microbial applications

2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Moatasem Al-Salih ◽  
Syakirah Samsudin ◽  
Siti Suri Arshad
Keyword(s):  
Iron Oxide ◽  
Laser Ablation ◽  
Density Functional ◽  
Health Concern ◽  
Klebsiella Pneumonia ◽  
Bacterial Inactivation ◽  
Gram Positive ◽  
Gram Negative ◽  
Triple Assessment ◽  
Bacterial Action

Abstract Background Environmental contamination by microbes is a major public health concern. A damp environment is one of the potential sources for microbe proliferation. Smart synthesis nanocatalytic coatings on surfaces, food, and material from different pathogen bacteria can inhibit using the Fe3O4/CNTs as anti-microbial growth can effectively curb this growing threat. In this present work, the anti-microbial efficacy of synthesis of a compound nanoparticle-containing iron oxide-multi-walled carbon nanotube was combined by laser ablation PLAL and explored the anti-bacterial action of colloidal solution of Fe3O4/CNTs NPs that was evaluated against bacteria which is classified as gram-negative (Escherichia coli (E. coli), Klebsiella pneumonia (K. pneumonia), and also that is identified as gram-positive (Streptococcus pyogenes (S .pyogenes) and Staphylococcus aureus (S. aureus) under visible light irradiation. Results Doping of a minute fraction of iron(III) salt (0.5 mol%) in a volatile solvent (ethanol) was carried out via the sol-gel technique. Fe3O4 was further calcined at various temperatures (in the range of 500–700 °C) to evaluate the thermal stability of the Fe3O4 nanoporous oxidizer nanoparticles. The physicochemical properties of the samples were characterized through X-ray diffraction (XRD), atomic force microscopy (AFM), attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), and UV–Visible spectroscopy techniques. XRD results revealed that the nanoparticles framework of Fe3O4 was maintained well up to 650 °C by the Fe dopant. UV–Vis results suggested that absorption property of combination Fe3O4/CNTs nanopowder by PLAL was enhanced and the band gap is reduced into 2.0 eV. Conclusions Density functional theory (DFT) studies emphasize the introduction of Fe+ and Fe2+ ions by replacing other ions in the CNT lattice, therefore creating oxygen vacancies. These further promoted anti-microbial efficiency. A significantly high bacterial inactivation that indicates results was evaluated and that the mean estimations of restraint were determined from triple assessment in every appraisal at 400 ml which represent the best anti-bacterial action against gram-positive and gram-negative microbes.

Cu Doped TiO2: Visible Light Assisted Photocatalytic Antimicrobial Activity and High Temperature Anatase Stability

2018 ◽  
Author(s):  
Snehamol Mathew ◽  
Priyanka Ganguly ◽  
Stephen Rhatigan ◽  
Vignesh Kumaravel ◽  
Ciara Byrne ◽  
...  
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Density Functional ◽  
Anatase Phase ◽  
Sol Gel ◽  
Chemical Properties ◽  
Light Irradiation ◽  
Health Concern ◽  
Bacterial Inactivation ◽  
X Ray

Indoor surface contamination by microbes is a major public health concern. A damp environment is one potential sources for microbe proliferation. Smart photocatalytic coatings on building surfaces using semiconductors like titania (TiO<sub>2</sub>) can effectively curb this growing threat.<b> </b>Metal-doped titania in anatase phase has been proved as a promising candidate for energy and environmental applications. In this present work, the antimicrobial efficacy of copper (Cu) doped TiO<sub>2 </sub>(Cu-TiO<sub>2</sub>) was evaluated against <i>Escherichia coli</i> (Gram-negative) and <i>Staphylococcus aureus</i> (Gram-positive) under visible light irradiation. Doping of a minute fraction of Cu (0.5 mol %) in TiO<sub>2 </sub>was carried out <i>via</i> sol-gel technique. Cu-TiO<sub>2</sub> further calcined at various temperatures (in the range of 500 °C – 700 °C) to evaluate the thermal stability of TiO<sub>2</sub> anatase phase. The physico-chemical properties of the samples were characterised through X-ray diffraction (XRD), Raman spectroscopy, X-ray photo-electron spectroscopy (XPS) and UV-visible spectroscopy techniques. XRD results revealed that the anatase phase of TiO<sub>2</sub> was maintained well, up to 650 °C, by the Cu dopant. UV-DRS results suggested that the visible light absorption property of Cu-TiO<sub>2 </sub>was enhanced and the band gap is reduced to 2.8 eV. Density functional theory (DFT) studies emphasises the introduction of Cu<sup>+</sup> and Cu<sup>2+</sup> ions by replacing Ti<sup>4+</sup> ions in the TiO<sub>2</sub> lattice, creating oxygen vacancies. These further promoted the photocatalytic efficiency. A significantly high bacterial inactivation (99.9%) was attained in 30 mins of visible light irradiation by Cu-TiO<sub>2</sub>.

scholarly journals Preparation and Characterization of Lead Oxide Nanoparticles by Laser Ablation as Antibacterial Agent

2017 ◽  
Vol 14 (4) ◽  
pp. 801-807
Author(s):  
Baghdad Science Journal
Keyword(s):  
Laser Ablation ◽  
Lead Oxide ◽  
Laser Energy ◽  
Laser Pulses ◽  
Diffusion Method ◽  
Lead Target ◽  
Oxide Nanoparticles ◽  
Gram Positive ◽  
Gram Negative ◽  
Gram Positive Bacteria

In this work, lead oxide nanoparticles were prepared by laser ablation of lead target immersed in deionized water by using pulsed Nd:YAG laser with laser energy 400 mJ/pulse and different laser pulses. The chemical bonding of lead oxide nps was investigated by Fourier Transform Infrared (FTIR); surface morphology and optical properties were investigated by Scanning Electron Microscope (SEM) and UV-Visible spectroscopy respectively, and the size effect of lead oxide nanoparticles was studied on its antibacterial action against two types of bacteria Gram-negitive (Escherichia coli) and Gram-positive (Staphylococcusaurus) by diffusion method. The antibacterial property results show that the antibacterial activity of the Lead oxide NPs was inversely proportional to the size of the nanoparticles in both Gram-negative and Gram-positive, and also it has been found that Gram-positive bacteria possess have greater sensitivity and less resistance to the lead oxide nanoparticles compared with Gram-negative bacteria.

Gram-Negative and Gram-Positive Antibacterial Properties of the Whole Plant Extract of Willow Herb (Epilobium angustifolium)

2011 ◽  
Vol 14 (1) ◽  
pp. 85-89 ◽  
Author(s):  
Wally J. Bartfay ◽  
Emma Bartfay ◽  
Julia Green Johnson
Keyword(s):  
Plant Extract ◽  
Micrococcus Luteus ◽  
Antibacterial Properties ◽  
Health Concern ◽  
Gram Negative Bacteria ◽  
Gram Positive ◽  
Gram Negative ◽  
Whole Plant ◽  
Epilobium Angustifolium ◽  
Herb Extract

The emergence of new pathogens and the increase in the number of multidrug-resistant strains in well-established pathogens during the past decade represent a growing public health concern globally. With the current lack of research and development of new antibiotics by large pharmaceutical companies due to poor financial returns, new alternatives need to be explored including natural herbal or plant-based extracts with reported antibacterial properties. Willow herb ( Epilobium angustifolium) preparations have been used in traditional aboriginal and folk medicine preparations externally as an antiphlogistic to treat prostate and gastrointestinal disorders and as an antiseptic to treat infected wounds. The authors hypothesized that a whole plant extract of willow herb would exhibit antimicrobial properties on a variety of both Gram-positive and gram-negative bacteria in culture. The authors found that, in comparison to growth controls, willow herb extract significantly inhibited the growth of Micrococcus luteus ( p < .01), Staphylococcus aureus ( p < .05), Escherichia coli ( p < .001), and Pseudomonas aeruginosa ( p < .001). They also found that willow herb extract inhibited the growth of bacteria in culture more effectively than vancomycin ( p < .05) or tetracycline ( p < .004). These results provide preliminary support for the traditional folkloric claim that the plant willow herb possesses antibacterial properties against a variety of gram-positive and gram-negative bacteria. Given that whole plant extract was utilized for this study, further investigations are warranted to determine which specific part of the plant (i.e., leaves, stem, roots, and flowers) possess the antibacterial properties.

scholarly journals Antibacterial Activities of 5-Nitro-2-uryl and 5-Nitro-2-Imidazolyl Derivatives of 1,3,4-Thiadiazole

2019 ◽  
Vol 4 (2) ◽  
Author(s):  
Mohammad Hassan Moshafi ◽  
Ali Peymani ◽  
Alireza Foroumadi ◽  
Mohammad Reza Zabihi ◽  
Farzad Doostishoar
Keyword(s):  
Minimum Inhibitory Concentration ◽  
Antimicrobial Agents ◽  
Inhibitory Concentration ◽  
Positive Control ◽  
Klebsiella Pneumonia ◽  
Bacterial Strains ◽  
Antibacterial Effects ◽  
Gram Positive ◽  
Gram Negative ◽  
Derivatives Of

Introduction: Nitrofurans and nitroimidazoles are broad-spectrum antimicrobial agents, which affect the microbial DNA. The aim of the present study was to evaluate the new derivatives of these two groups of antimicrobials against certain Gram-positive and Gram-negative bacterial strains. Materials and Methods: Seven new derivatives of nitrofurans and nitroimidazoles were synthesized, and 6.4 mg of each derivative was dissolved in dimethyl sulfoxide. Then, 8 serial dilutions (0.5, 1, 2, 4, 8, 16, 32, and 64 μg/ml) of each derivative was prepared using Muller-Hinton broth, and the minimum inhibitory concentration for each derivative was measured and compared to ciprofloxacin (standard). Results: All the derivatives had no antibacterial effects against Gram-negative bacteria (minimum inhibitory concentration > 64 μg/ml); only 2-(5-nitro-2-furyl)-5-(n-pentylsulfunyl)-1,3,4-thiadiazole exhibited mild antibacterial effects against Klebsiella pneumonia (minimum inhibitory concentration of 16-32 μg/ml). The antibacterial effects of the derivatives against Gram-positive bacteria also showed variations from complete inhibition of the growth of Staphylococcus epidermidis and Bacillus subtilis (minimum inhibitory concentration < 0.5 μg/ml) by 2-(5-nitro-2-furyl)-5-(n-buthylthio)-1,3,4-thiadiazole to no inhibition of S. epidermidis and streptococcus pyogenes. Conclusion: These compounds have weak antibacterial effects; only two derivatives showed antibacterial effects similar to that of the positive control.

scholarly journals Bacterial Profile and Antibiogram of Hospital-Acquired Pneumonia and Ventilator-Associated Pneumonia Patients in ICU of Raden Mattaher Hospital Jambi

2020 ◽  
Vol 26 (3) ◽  
Author(s):  
Sotianingsih Sotianingsih ◽  
Samsirun H. ◽  
Lipinwati Lipinwati
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Culture Media ◽  
Sensitivity Test ◽  
Sputum Culture ◽  
Klebsiella Pneumonia ◽  
Gram Negative Bacteria ◽  
Gram Positive ◽  
Acinetobacter Baumanii ◽  
Gram Negative ◽  
Gram Positive Bacteria

Pneumonia is defined as an inflammation of the lungs caused by microorganisms (bacteria, viruses, fungi, parasites). This research aimed to determine the pneumonia-causing bacteria along with the sensitivity and the antibiotic resistance test. This research was a descriptive study with samples of ICU pneumonia patients at Raden Mattaher Regional Hospital during the study period. All samples were consecutively selected. Samples for blood culture were incubated in the BactAlert device, whereas the sensitivity test was then performed using Vitex instruments. Sputum was previously enriched with BHI media and then cultured on culture media, and sensitivity test with the Vitex instruments was carried out. Of the 354 ICU patients during the study period, 30 patients (11.8%) had pneumonia, but only 19 patients could undergo sputum culture. Five of 19 patients were infected with Gram-positive bacteria, and 14 patients were infected with Gram-negative bacteria. The most commonly found bacteria were Klebsiella pneumonia (36.84%), followed by Acinetobacter baumanii (21.05%) and Pseudomonas aeruginosa (10.53%). Gram-negative bacteria obtained from sputum culture in this study were resistant to almost all antibiotic groups, especially penicillin, cephalosporin, quinolone, and tetracycline groups. Gram-positive bacteria obtained from sputum culture in this study were resistant to the penicillin antibiotic. The most commonly found bacteria were Klebsiella pneumonia (36.84%), followed by Acinetobacter baumanii (21.05%) and Pseudomonas aeruginosa (10.53%). The bacteria cultured from the sputum showed multidrug resistance mainly to the penicillin and cephalosporin antibiotic. This research data can be used to consider the treatment of pneumonia patients to decide more appropriate therapy.

scholarly journals Blood culture positive sepsis and sensitivity pattern in a tertiary care neonatal centre in eastern India

2019 ◽  
Vol 6 (2) ◽  
pp. 487
Author(s):  
Soumini Rath ◽  
Santosh Kumar Panda ◽  
Manas Kumar Nayak ◽  
Deepti Damayanty Pradhan
Keyword(s):  
Blood Culture ◽  
Neonatal Sepsis ◽  
Early Onset ◽  
Tertiary Care ◽  
Neonatal Care ◽  
Care Practice ◽  
Klebsiella Pneumonia ◽  
Gram Positive ◽  
Gram Negative ◽  
Culture Positive

Background: The objective of this study is to evaluate sensitive pattern of causative organisms of neonatal sepsis with its clinical outcome in a tertiary neonatal care unit of eastern India.Methods: This retrospective observational cohort study was done in a tertiary care hospital of Odisha. All the blood culture positive neonatal sepsis cases, excluding neonates with multiple congenital malformations, diagnosed during January 2017 to December 2018 were analysed using descriptive summary statistics.Results: A total of 73 neonatal sepsis cases were diagnosed by BacT/Alert and VITEK-2 blood culture method. Among them, 50 (68%) babies had gram negative sepsis,14 (19%) cases of gram-positive sepsis and nine (13%) cases of fungal sepsis. In present study 38 (52%) cases were early onset sepsis, 38(52 %) babies were term, 55(75%) were male and 44 (60%) babies were out born. Klebsiella pneumonia and Acinetobacter were the most common organism in early onset and late onset sepsis respectively. Among gram negative organism (GNB), 66% were multi drug resistant. A fifty percent of gram-negative organism were sensitive to meropenem and 28% were sensitive to piperacillin/tazobactam. The sensitivity of GNB to colistin, ciprofloxacin, amikacin was 76%, 64% and 56% respectively. The sensitivity of gram-positive organisms to linezolid, vancomycin, teicoplanin and penicillin were 92%, 85%,85% and 20% respectively. Survival rate among culture positive sepsis was 83%.Conclusions: Multi drug organisms are emerging in modern neonatal care practice. Practice of antibiotic stewardship may save the babies from multidrug resistance organism in future.

scholarly journals Antibacterial Properties of Polysulfone Membranes Blended with Arabic Gum

Membranes ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 29 ◽  
Author(s):  
Souhir Sabri ◽  
Ahmad Najjar ◽  
Yehia Manawi ◽  
Nahla Eltai ◽  
Asma Al-Thani ◽  
...  
Keyword(s):  
Bacterial Colonization ◽  
Membrane Surface ◽  
Bacterial Species ◽  
Antibacterial Properties ◽  
Bacterial Attachment ◽  
Inversion Method ◽  
Klebsiella Pneumonia ◽  
Gram Positive ◽  
Arabic Gum ◽  
Gram Negative

Polysulfone (PS) membranes blended with different loadings of arabic gum (AG) were synthesized using phase inversion method and the antibacterial properties of the synthesized membranes were tested using a number Gram-negative (Escherichia coli, Klebsiella pneumonia and Pseudomonas aeruginosa) and Gram-positive (Staphylococcus aureus) bacterial species. It was shown that AG addition to the dope polymer solutions essentially changed porous structure, hydrophilicity and zeta potential of the cast PS/AG membranes. These changes were due to the amphiphilic properties of AG macromolecules that contained negatively charged hydrophilic residues. A pronounced decrease in bacterial attachment was seen in the field emission scanning electron microscopy (FESEM) images for PS/AG membrane samples compared to both commercial (Microdyn-Nadir) and bare PS (without AG) membranes. AG loading dependent trend was observed where the prevention of bacterial colonization on the membrane surface was strongest at the highest (7 wt. %) AG loading in the casting solution. Possible mechanisms for the prevention of bacterial colonization were discussed. Significantly, the inhibition of bacterial attachment and growth on PS/AG membranes was observed for both Gram-positive and Gram-negative bacterial models, rendering these novel membranes with strong biofouling resistance attractive for water treatment applications.

Functionalized Magnetic Iron Oxide (Fe3O4) Nanoparticles for Capturing Gram-Positive and Gram-Negative Bacteria

2014 ◽  
Vol 10 (8) ◽  
pp. 1429-1439 ◽  
Author(s):  
P. Muralidhar Reddy ◽  
Kai-Chih Chang ◽  
Zhen-Jun Liu ◽  
Cheng-Tung Chen ◽  
Yen-Peng Ho
Keyword(s):  
Iron Oxide ◽  
Gram Negative Bacteria ◽  
Gram Positive ◽  
Gram Negative ◽  
Magnetic Iron Oxide

scholarly journals KEPEKAAN ANTIMIKROBA KULTUR DARAH DI SEPSIS NEONATAL

2016 ◽  
Vol 19 (1) ◽  
pp. 24
Author(s):  
Tajuddin Noor ◽  
Nurhayana Sennang ◽  
Benny Rusli
Keyword(s):  
Blood Culture ◽  
Staphylococcus Epidermidis ◽  
Secondary Data ◽  
Klebsiella Pneumonia ◽  
Negative Group ◽  
Gram Positive ◽  
Gram Negative ◽  
Positive Group ◽  
Antimicrobial Sensitivity ◽  
Mortality Causes

Sepsis was one of the morbidity and mortality causes in neonatal. The diagnosis and treatment requires the bacterial identification and selection of sensitive antimicrobials. The aim of this study was to know the bacterial pattern and antimicrobial sensitivity of blood culture in the suspected neonatal sepsis patients who were treated at NICU in Dr.Wahidin Sudirohusodo Hospital Makassar. A retrospective study was conducted with secondary data from the culture and antimicrobial susceptibility test between the period of June 2010−July 2011. In this present study was found that from the total 91 blood culture isolates, bacteria Gram-negative group was 85.7% and Grampositive was 14.3% and the isolate encountered in order of frequency were Alkali genes faecalis 50.5%, Klebsiella pneumonia 25.3%, and Staphylococcus epidermidis 9.9%. In the Gram-negatives group, the isolate often encountered were Alkali genes faecalis 59.0%, Klebsiella pneumonia 29.4% and Enterobacter spp 6.4% while in the Gram-positive group were found Staphylococcus epidermidis 69.2% and Staphylococcus saprophytic 23.1%. The more sensitive antimicrobal that belong to Gram-negative group were Meropenem 94.4%, Levofloxacin 92.1%, and Ceftazidime 77.0% while the more resistant were Ampicillin 94.6%, Gentamycin 89.1% and Cefuroxime 82.7%. The more sensitive antimicrobal that belong to Gram-positive group were Vancomycin and Chloramphenicol 91.7% and Novobiosin 76.9% while the more resistant were Gentamycin and Ceftriaxone 100.0% and Amoxicillin 91.7%. Based on this study it can be concluded that Gram-negative aerobe bacteria was more common than the Gram-positive one. Meropenem, Levofloxacin and Ceftazidime antimicrobal were high sensitive to Gram-negative while Vancomycin, Chloramphenicol, and Novobiocin were high sensitive to Gram-positive. The resistance of Ampicillin and Gentamycin were found in both bacterially groups of sepsis suspected neonatal patients in NICU

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