Papers by Keyword: Antibacterial

Abstract: There is an urgent necessity to develop affordable, eco-friendly, and biodegradable materials to combat bacterial threats using innovative techniques and combinations. Fused Deposition Modeling is the most efficient and economical method for creating complex bi-metallic composites, which have demonstrated extraordinary antibacterial properties against common strains. This study investigates the antibacterial efficacy of two sets of biodegradable bi-materials consisting of PLA/Copper, one time by incorporating PLA/Stainless Steel and the other time PLA/Aluminum. The findings revealed that both sets exhibited outstanding antibacterial effectiveness within a concise period of less than ten minutes. Consequently, 3D-printed polymeric composites infused with metallic particles hold promise for various applications, including construction, biomedical applications, food packaging, and tissue engineering. Moreover, these composite materials offer sustainable solutions for public spaces and hospitals, where surface contact is frequent, contributing to a cleaner and safer environment.

Abstract: Bacterial growth on textiles, particularly underwear products for both men and women, can result in serious health issues such as rashes, blisters, yeast infections, and even an increased risk of prostate cancer for men and cervical cancer for women. Additionally, it can cause unpleasant smells, stains, and discolorations in the fabric, reducing the product’s life cycles and environmental issues. This study aims to develop a fabric for underwear that can terminate bacteria and bring comfort to the wearer. The cotton fabric treated with Ag-doped ZnO nanoparticles (NPs) was investigated in this research. Tensile strength, morphology, structure, moisture content, and antibacterial properties based on the disc method and count plate against Staphylococcus aureus and Escherichia coli were examined. Both strains showed 99.9% antibacterial activity by cotton fabric treated with Ag-doped ZnO nanoparticles. The results demonstrate that the treated fabrics have excellent performance, making them ideal for use in underwear products and reducing health problems caused by bacteria.

Abstract: Green chemistry methods are now an intriguing field of study in agriculture, particularly in pest management. For this reason, novel approaches for the more efficient manufacturing of nanoparticles with improved biological characteristics have been developed. Because nanoparticle production is faster, this method is more eco-friendly and less toxic than old methods. The biosynthesis of silver nanoparticles (AgNPs) using Leucaena leucocephala, Mentha aquatica, and Zingiber officinale extracts and their antibacterial activity against Pectobacterium cartovorum, Agrobacterium tumefaciens, and Xanthomonas axonopodis. The results showed that spectroscopic and microscopic methods, such as UV-Vis spectroscopy, revealed absorption peaks for Ll-AgNPs at 415 nm, 420 nm for Ma-AgNPs, and 430 nm for Zo-AgNPs, indicating the silver nature of the prepared colloidal samples. The TEM images revealed the quasi-spherical morphology of NPs with an average size of 12.51, 10.63, and 10.26 nm for Ll-AgNPs, Ma-AgNPs, and Zo-AgNPs. The X-ray diffraction (XRD) pattern revealed a face-centered cubic (FCC) structure with crystallite. While distinctive peaks in an investigation using Fourier transform infrared (FT-IR) spectroscopy showed that several biomolecules were attached to AgNPs, antibacterial activity was evaluated by an inhibitory zone test, which showed high efficiency against P. cartovorum, A. tumefaciens, and X. axonopodis, with an antibacterial function comparable to L. leucocephala, M. aquatica, and Z. officinale extract. The green production of silver nanoparticles has the potential to be a useful tool in pest management strategies against phytopathogenic bacteria.

Abstract: Decorated Fe₂WO₆ onto SrTiO₃ nanocubes (Fe₂WO₆/SrTiO₃) composites were fabricated by a two-step hydrothermal technique. Some spectroscopic techniques were adopted to delve the catalyst samples. The composite manifested a prominent antibacterial effect toward Escherichia Coli and Bacillus cereus bacteria. Importantly, the as-fabricated composite was testified to exhibit good photodegradation of chlortetracycline hydrochloride under visible light. The eminent performance of the composite was ascribed to not only the excellent absorption of visible light, but also due to the synergistic effect of S-scheme heterojunction which endowed for the high yield of the active species for the pollutant and microorganism destruction. Our study implied that Fe₂WO₆/SrTiO₃ composites can be a potential bifunctional option for remediating microbial-polluted water.

Abstract: Single crystal of [Ni(4-AP)₄(NCS)₂] complex compound has been obtained using solvothermal method at 70 °C for 15 hours (yield = 41%). Crystal structure of [Ni(4-AP)₄(NCS)₂] has a distorted octahedral structure with orthorhombic crystal system, Pccn space group, Z = 4, and a, b, and c values of 17.1091(5) Å, 9.6686 (3) Å, 16.1998 (5) Å. Hirshfeld Surface analysis shows that intermolecular hydrogen bonds in the complex compound comes from N–H∙∙∙∙N and N–H∙∙∙∙S. The intermolecular interactions are dominated by H---H, C---H/H---C, and H---S/S---H by 39.0%, 29.6%, and 24.7%, respectively. The relatively less contributions are N---H/H---N, S---C/C---S, and S---N/N---S at 6.3%, 0.2%, and 0.1%, respectively. The [Ni(4-AP)₄(NCS)₂] complex has antibacterial activity against Escherichia coli and Staphylococcus aureus.

Abstract: Polymeric materials were modified by nanoparticles on powder (NPP) facility in which metal nanoparticles (Cu, Cu/Zn alloy etc.) are formed on the surface of rotating carrier powder by using physical vapor deposition process untile the metal content reached 0.3wt.%. The polymer material with metal nanoparticles deposited on their surface through the NPP process was then added to the raw polymer material at a ratio of 1 to 9. The mixture of modified polymer powder and raw polymer powder were then processd into a film by conventional processes such as hot melting, extrusion, T-die, and antibacterial characteristics of the film were investigated. We ultimately manufactured antibacterial food package using the film and conducted preservation test for two weeks at room temperature. Since food package containing 0.03wt.% Cu nanoparticles showed over 99.9% bacteria reduction rate, it slowed down the progress of deterioration significantly compared to conventional packages. For safety evaluation, the amount of copper released out was analyzed and a cytotoxicity test was also conducted.

Abstract: The nickel zinc nanoferrites with configurationNi_0.45Zn_0.55–xM_xFe₂O₄were achieved where x = 0.0, 0.1, 0.2 and 0.3 and M = Cobalt, Copper, Magnesiumusing solution-combustion method by availing sucrose as a fuel. The procured nanoferrites were investigated forstructural properties using TEM, antibacterial and antifungal propertiesby Kirby-Bauer Disk Diffusion Susceptibility Test also calledas Agar diffusion method. The synthesized nanoferrites were tested for their antibacterial activities against Gram negative (Escherichiacoli) and Gram positive (Bacillus cerus) bacterial strains. Also, investigation was evaluated for their antifungal activity against Aspergillus niger. Against Bacillus cerus, sample Ni_0.45 Zn_0.45Cu_0.1Fe₂O₄ showed maximum antibacterial activity. The maximum antifungal activity was observed for Ni_0.45 Zn_0.35Co_0.2Fe₂O₄.

Abstract: In this study, several samples of nanocopper fiber fabrics with different proportions of copper content were used. Among them, black copper antibacterial staple Polyamide fiber (PA) and 6 wt.% copper antibacterial fabric were selected. Positron emission tomography (PET) and other fabrics containing nanocopper components were used as experimental control samples. In the process, a raw material containing blending slurry, a nanometal solution, several inorganic particles, and thermoplastic polyurethane colloidal particles were used. The raw material was mixed and stirred before being dried and hot-melted. In the first stage of the process, the wire was cooled vigorously for conversion into the second stage form where it became a final product, a nanocopper fiber yarn. Taguchi analysis was used to compare the antibacterial property of the nanocopper powder between different particle sizes under the same distribution, weight, and fiber granulation characteristics. Two bacterial species, specifically Escherichia coli and Staphylococcus aureus, were used to investigate the antibacterial property of the fabric. In addition, we investigated the mechanical properties of the fabric and observed its surface structure. The copper content in the nanocopper fiber fabrics was detected using an X-ray fluorescence spectrometer. This finding indicate that the samples contained copper antibacterial components fabrics. Subsequently, the uniformity and aggregation degree of the copper distribution on the fiber fabrics were compared between different fiber polyester materials.

Abstract: Polyetheretherketone (PEEK) as alternate biomaterial to traditional metallic implant materials has become greater important. At the same time have greater chemical resistance, mechanical properties, biocompatibility and radiolucency, making it convenient for use as dental and orthopedic implants. In the present study the biological behavior was evaluated of polymer composites based polyetheretherketone combined with various nano hydroxyapatite and nano titanium dioxide blending up to (1.5 wt%). The bioactivity of the specimens was evaluated by investigation apatite formation after immersion for 7 days and 14 days in simulated body fluid (SBF). XRD and SEM were used to approve the bioactivity of the specimens. Cell viability, proliferation, and the cell attachment activity of L929 mouse fibroblast cells was evaluated after (1, 3 & 5) days by MTT assay. Antibacterial property of the specimens versus S. aureus was observed with optical density methods. The results detected that the apatite-like layer formation was clearly observed on specimens after immersion for different period in simulated body fluid (SBF). Moreover, Results of MTT assay recorded the PEEK specimens excited the activity of fibroblasts and therefore a high cytocompatibility was noticed and specimens showed antibacterial properties against S. aureus.

Abstract: Synthesis of colloidal silver nanoparticles has been successfully conducted through the chemical reduction technique. The synthesis used AgNO₃, NaOH, and alginate as the precursor, accelerator reagent, and reducing agent and stabilizer, respectively. The effects of heating temperature, reaction time, accelerator concentration, and precursor concentration were investigated according to the localized surface plasmon resonance (LSPR) phenomenon using a UV-Vis spectrophotometer. The nanoparticle size distribution was observed via a Particle Size Analyzer (PSA). The stability of silver nanoparticles was studied for 8 weeks based on the LSPR phenomenon. Then, their antibacterial performance toward S. Aureus ATCC 25923 and E. Coli ATCC 25922 was examined. The results showed the absorbance intensities representing the number of silver nanoparticles formed were influenced by temperature, reaction time, NaOH concentration, and AgNO₃ concentration. At 50°C heating, the optimum synthesis of silver nanoparticles was achieved at 50 min with a NaOH concentration of 0.013M. The higher AgNO₃ concentration resulted in a greater concentration of silver nanoparticles produced. From the PSA characterization, the average particle sizes for the samples were 1.82 nm and 1.30 nm for AgNO₃ concentrations (% w/w; AgNO₃/Alginate) of 1.6% and 2.4%, respectively. Based on the LSPR phenomenon, colloidal silver nanoparticles were stable in storage for 8 weeks at room temperature. The increase in the concentration of silver nanoparticles within colloidal could enhance antibacterial performance against S. Aureus and E. Coli. Accordingly, silver nanoparticles synthesized with alginate as a stabilizer have the potential as an antibacterial compound for medical applications.