Silver Nanoparticles Anchored 5-methoxy benzimidazol thiomethanol (MBITM): Modulate, Characterization and Comparative Studies on MBITM and Ag-MBITM Antibacterial Activities

Synthesis of Silver Nanoparticles Using Camellia sinensis Leaf Extract: Promising Particles for the Treatment of Cancer and Diabetes

Both diabetes and cancer pose significant threats to public health. To overcome these challenges, nanobiotechnology offers innovative solutions for the treatment of these diseases. However, the synthesis of nanoparticles can be complex, costly and environmentally toxic. Therefore, in this study, we successfully synthesized Camellia sinensis silver nanoparticles (CS-AgNPs) biologically from methanolic leaf extract of C. sinensis and as confirmed by the visual appearance which exhibited strong absorption at 456 nm in UV-visible spectroscopy. The fourier transform infrared spectroscopy (FTIR) analysis revealed that phytochemicals of C. sinensis were coated with AgNPs. Scanning electron microscopy (SEM) analysis showed the spherical shape of CS-AgNPs, with a size of 15.954 nm, while X-ray diffraction spectrometry (XRD) analysis detected a size of 20.32 nm. Thermogravimetric analysis (TGA) indicated the thermal stability of CS-AgNPs. The synthesized CS-AgNPs significantly inhibited the ehrlich ascites carcinoma (EAC) cell growth with 53.42±1.101 %. The EAC cell line induced mice exhibited increased level of the serum aspartate aminotransferase (AST), alanine transaminase (ALT), and alkaline phosphatase (ALP), however this elevated serum parameter significantly reduced and controlled by the treatment with CS-AgNPs. Moreover, in a streptozotocin-induced diabetic mice model, CS-AgNPs greatly reduced blood glucose, total cholesterol, triglyceride, low-density lipoprotein (LDL) and creatinine levels. These findings highlight that the synthesized CS-AgNPs have significant anticancer and antidiabetic activities that could be used as promising particles for the treatment of these major diseases. However, pre-clinical and clinical trial should be addressed before use this particles as therapeutics agents.

Hand hygiene status and its associated factors among housemaids working in communal living residences in Jimma city, southwest Ethiopia

Objective

Hand hygiene is a milestone, cost-effective, and convenient strategy to prevent the transfer of pathogenic micro-organisms. However, housemaids operating inside a kitchen can be the source of infection. In addition, hand hygiene among housemaids working in dwellings was underexplored. This study aimed to assess the hand hygiene status and associated factors among housemaids working in communal living residences in Jimma City, Southwest Ethiopia.

Methods

A total of 230 housemaids were included in this cross-sectional study. Total samples were proportionally allocated for each residence and a simple random sampling technique was applied to select the study participants. Hand hygiene status and relevant characteristics were collected through face-to-face interviews and observations. Hand swab samples were collected and tested for bacterial contaminants. Then, it was inoculated aseptically using streak-plating methods on mannitol salt agar (MSA), MacConkey agar (MCA), salmonella-shigella agar (SSA), and eosin methylene blue (EMB) agar and then incubated at 37 °C for 24 h. Data was edited, cleaned, and double-entered into Epidata version 3.1 and then exported to the statistical package for social science statistics version 26 for further analysis. Binary logistic regression was used to identify associated factors. Statistically significant was declared at P value < 0.05.

Results

Two hundred twenty-five housemaids were interviewed with a response rate of 97.8 %. The results showed that the proportion of good hand hygiene status among the housemaids was only 28.0 %. Although the majority of participants reported washing their hands frequently, the prevalence of bacterial contaminants on their hands was high at 72 %. The study identified several factors associated with hand hygiene status, including the occupational status of heads of households (AOR = 0.030, 95 % CI: 0.003, 0.348; P = 0.0050), the effectiveness of the heads of household (AOR = 13.955, 95 % CI: 1.442, 13.500; P = 0.0230), and the removal of accessories during handwashing (AOR = 20.844, 95 % CI: 2.190, 9.842; P = 0.0080).

Conclusion

Overall, the hand hygiene status of housemaids was found to be poor and influenced by demographics and other relevant characteristics. The study emphasizes the need for a multimodal strategy involving household heads, local and national authorities, and other stakeholders to raise awareness and advocate for hand hygiene to prevent communicable diseases in the wider community, particularly in the study area.

Ag-Ag2O-TiO2@Eggshell membrane polymer nanocomposite: Conductivity and healing the wound infected with S. aureus studies ICSEM-2021

The natural polymer-containing nanocomposite (Ag-Ag2O-TiO2@Eggshell membrane protein) was prepared using a rapid and efficient one-pot method. Diagnosis of this nanostructure was performed by X-ray diffraction, Energy dispersive X-ray, and SEM. The characterization results proved that this multifunctional nanocomposite was successfully synthesized within the scale of nanoscience. The conductivity of this polymer was studied in the presence of sodium iodide using acetonitrile as a solvent by complex impedance spectroscopy. The conductivity measurements prove that the highest conductivity was obtained with the highest salt concentration 1:5=Na:O. Furthermore, Ag-Ag2O-TiO2@Eggshell membrane protein nanocomposite was used to study its ability for healing the wound infected with antibiotic-resistant Staphylococcus aureus for 2 weeks. The histopathological results have shown that there is an improvement in all the indicative signs of disease with rapid development of the epidermal layer proliferating and then healing of the infected wounds rapidly.

Inhibition Action of Non‐polar Eichhornia crassipes Extract on the Carbon Steel Corrosion in 1 M HCl

In this research, the anti‐corrosion properties of water hyacinth roots are studying. Firstly the roots are extracted by hexane solvent and a non‐polar extract is obtained. At a constant temperature (303 K) the inhibition efficiency increases and the corrosion current density decreases with the increasing of the inhibitor concentration. The thermodynamic measurement results show the mixed (chemical and physical) adsorption process and exothermic process.

5-Methoxy-2-mercaptobenzimidazole as an efficient inhibitor on tyrosinase: Inhibitory activity and mechanism

In this study, 5-methoxy-2-mercaptobenzimidazole (5-M-2-MB) was confirmed as an efficient tyrosinase inhibitor by methods of enzyme kinetic, fluorescence quenching, ANS-binding, thermodynamics, energy transfer, and molecular docking in combination. The results proved that 5-M-2-MB significantly inhibited the tyrosinase (IC₅₀ = 60 ± 2 nM) in a reversible and competitive way with the K_i value of 80 ± 1 nM. It quenched the intrinsic fluorescence of tyrosinase through a static mechanism, and caused conformational change of the enzyme by increasing the hydrophobic region. Moreover, this compound could bind to tyrosinase and form 5-M-2-MB-tyrosinase complex by hydrogen bond and hydrophobic interaction. The interactions were generated between 5-M-2-MB and specific amino acid residues (Trp-358, Thr-308, Glu-356, and Asp-357) located on the A chain of tyrosinase. Therefore, this study would offer a theoretical foundation for developing the new tyrosinase inhibitor.

The Potential of Silver Nanoparticles for Antiviral and Antibacterial Applications: A Mechanism of Action

Rapid development of nanotechnology has been in high demand, especially for silver nanoparticles (AgNPs) since they have been proven to be useful in various fields such as medicine, textiles, and household appliances. AgNPs are very important because of their unique physicochemical and antimicrobial properties, with a myriad of activities that are applicable in various fields, including wound care management. This review aimed to elucidate the underlying mechanisms of AgNPs that are responsible for their antiviral properties and their antibacterial activity towards the microorganisms. AgNPs can be synthesized through three different methods-physical, chemical, and biological synthesis-as indicated in this review. The applications and limitations of the AgNPs such as their cytotoxicity towards humans and the environment, will be discussed. Based on the literature search obtained, the properties of AgNPs scrutinizing the antibacterial or antiviral effect shown different interaction towards bacteria which dependent on the synthesis processes followed by the morphological structure of AgNPs.