Safety, efficacy, and wash effects of textiles treated with green antimicrobial Vikang99

Medical textiles are one of the most rapidly growing parts of the technical textiles sector in the textile industry. This work aims to investigate the medical applications of a curcumin/TiO2 nanocomposite fabricated on the surface of cotton fabric. The cotton fabric was pretreated with three crosslinking agents, namely citric acid, 3-Chloro-2-hydroxypropyl trimethyl ammonium chloride (Quat 188) and 3-glycidyloxypropyltrimethoxysilane (GPTMS), by applying the nanocomposite to the modified cotton fabric using the pad-dry-cure method. The chemistry and morphology of the modified fabrics were examined by Fourier transform infrared spectroscopy, energy-dispersive X-ray spectroscopy, and scanning electron microscopy. In addition, the chemical mechanism for the nanocomposite-modified fabric was reported. UV protection (UPF) and antibacterial properties against Gram-positive S. aureus and Gram-negative E. coli bacterial strains were investigated. The durability of the fabrics to 20 washing cycles was also examined. Results demonstrated that the nanocomposite-modified cotton fabric exhibited superior antibacterial activity against Gram-negative bacteria than Gram-positive bacteria and excellent UV protection properties. Moreover, a good durability was obtained, which was possibly due to the effect of the crosslinker used. Among the three pre-modifications of the cotton fabric, Quat 188 modified fabric revealed the highest antibacterial activity compared with citric acid or GPTMS modified fabrics. This outcome suggested that the curcumin/TiO2 nanocomposite Quat 188-modified cotton fabric could be used as a biomedical textile due to its antibacterial properties.

Greener bio-based spherical nanoparticles for efficient multilayer textile fabrics nanocoating with outstanding fire retardancy, toxic gases suppression, reinforcement and antibacterial properties

Introduction: The extensive use of nanoparticles underscores the importance of developing sustainable synthesis methods. There is a growing demand for green synthesis, which prioritises clean, safe, and environmentally friendly methods devoid of high temperature, pressure, energy consumption, and toxic chemicals. Aim: To produce copper sulfate nanoparticles through the utilisation of Citrus sinensis extract and assess their antibacterial efficacy against Streptococcus mutans, Staphylococcus aureus and Enterococcus faecalis. This addresses the requirement for innovative and environmentally friendly antimicrobial agents for dental purposes. Materials and Methods: This in-vitro study was conducted at the Department of Conservative Dentistry and Endodontics at Saveetha Dental College, located in Chennai, Tamil Nadu, India, during the timeframe of April 2023 to June 2023 following the acquisition of ethical clearance from the Scientific Review Board Committee. Utilising Citrus sinensis extract, a green synthesis method was employed to synthesise copper sulfate nanoparticles. Characterisation procedures included Fourier-transform Infrared Spectroscopy (FTIR) analysis, Scanning Electron Microscopy (SEM) imaging, Energy Dispersive X-ray Analysis (EDAX) analysis, and antibacterial testing. The antibacterial effectiveness of the nanoparticles was evaluated against Streptococcus mutans, Staphylococcus aureus and Enterococcus faecalis using the agar well diffusion method. The data were subjected to statistical analysis using Statistical Package for Social Sciences (SPSS) version 23.0 to assess antibacterial effectiveness. Analysis of Variance (ANOVA) was employed to analyse the Zone of Inhibition (ZOI) regarding antibacterial efficacy. Results: The copper sulfate nanoparticles, synthesised through a green approach, displayed a spherical morphology as affirmed by SEM and exhibited characteristic peaks in FTIR spectra. EDAX analysis confirmed the elemental composition of the nanoparticles. Notably, the nanoparticles showcased the most substantial antibacterial activity against Enterococcus faecalis followed by Staphylococcus aureus, and the least activity was seen against Streptococcus mutans. Conclusion: Copper sulfate nanoparticles synthesised through Citrus sinensis mediation show promising antibacterial efficacy against Enterococcus faecalis, highlighting their potential for dental applications. However, further investigations are necessary to assess their cytotoxicity, evaluate their clinical viability, and explore broader applications in antimicrobial contexts.

The cotton fabric, which is widely used as personal protective equipment, is vulnerable to droplets that may contain pathogens. Thus, the functionalization of cotton fabric is usually carried out to get the desired properties. Graphene-based materials have some interesting properties like hydrophobic, photothermal, and antibacterial properties that can be used to modify cotton fabric. This research has made a cotton fabric coated with graphene from coconut shells and polymethyl siloxane. Graphite was obtained from burning coconut shells, and the modified Hummers method was used to get a graphene oxide solution (GO). A graphene oxide layer on cotton fabrics was added by the dip-pad-dry process, followed by reduction using ascorbic acid to produce a reduced graphene oxide (rGO) and immersion of cotton fabrics with methyl trichlorosilane in n-hexane to produce a polymethyl siloxane (PMS) layer. Scanning electron microscope (SEM) and Fourier-transform infrared (FTIR) are used to determine the morphology and functional groups in rGO-PMS-coated cotton fabric. Contact angle measurements to determine the hydrophobicity of the rGO-PMS-coated cotton fabric, which exhibits hydrophobic properties with a contact angle of 146.3 °, which can show self-cleaning ability while preventing water droplets from entering the fabric. Antibacterial activity was carried out using the disc diffusion method against Staphylococcus aureus and delivered a good result. The rGO-PMS-coated cotton fabric also shows photothermal capability when irradiated with infrared lamps. HIGHLIGHTS Graphene is a material that has various properties that can be exploited for the functionalization of ready-to-use materials Waste derived from natural resources can be used as a source of graphene, which can reduce the cost of graphene production Cotton fabric as a functionalized material can adopt the combined properties of graphene and silane such as photothermal, antibacterial, and hydrophobic properties GRAPHICAL ABSTRACT

Three novel N-halamine antibacterial precursors are synthesized and characterized in this study. The monomers are attached onto cotton fibers through hydrolysis of oxyethyl groups to form silyl ether linkages with cellulose, followed by immersing the cotton fabrics into sodium hypochlorite solution to endow it with antibacterial property. The surface properties of the treated cotton are characterized via Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermal gravity analysis (TGA), and X-ray photoelectron spectroscopy (XPS) analysis. The antimicrobial cotton fabrics provide about 6–7 logs reduction against Gram-negative Escherichia coli O157:H7 (ATCC 43895) and Gram-positive Staphylococcus aureus (ATCC 6538) within contact times of 5–20 min. The breaking strength of the treated cotton fabrics decreases by about 16–18 % in the warp and 13–16 % in the weft. The silyl ether linkages are stable towards standard washing, and the oxidative chlorine show good storage stability, but with an ordinary washing fastness and poor UV resistance. Most of the lost chlorines could be regenerated via exposure to diluted household bleach.

Fabrication of multifunctional textiles with durable antibacterial property and efficient oil-water separation via in situ growth of zeolitic imidazolate framework-8 (ZIF-8) on cotton fabric

In the present study, cotton fabric was exposed to laser exposure at different energy levels and then the silver nanoparticles were coated on untreated and laser treated cotton fabrics. Methylene blue dye was used to detect the presence of carboxylic acid groups (-COO−) on laser treated cotton and the dye absorption results were determined spectrophotometrically. ICP-OES (Inductively Coupled Plasma Optical Emission Spectroscopy) analysis and antibacterial tests were carried out to investigate the silver ion content and bactericidal properties of silver nanoparticles on cotton fabrics. Infrared spectroscopy (FTIR/ATR) analysis and scanning electron microscopy (SEM) were used to identify chemical changes and to study the morphology of the surface of the fibers. EDAX (Energy Dispersive X-ray Spectroscopy) analysis was calculated for SEM micrographs. The results showed according to the higher uptake of methylene blue dye that the negative charge of the carboxylic acid groups had been created by laser treatment. Although the FTIR spectroscopy results did not show an increase in carboxylic acid groups, the cationic dye absorption increased. The durability of the Ag+ ion particles on repeated laundered laser treated cotton was proven by antibacterial and ICP tests, particularly when the laser energy was increased.

Worldwide, increasing pollution and bacterial infections are posing a serious risk to human well‐being and society. Clothing and textiles are the major pathways for the transmission and aggravation of infectious diseases. Thus, imparting antibacterial properties to the textiles is perceived with great interest. With this motivation, this study aims to fabricate durable antibacterial cotton fabrics to protect the wearer from pathogenic microorganisms. Herein, the synthesis of zinc oxide nanoparticles (ZnO NPs) via chemical (ZOCM) and green (ZOGM) routes, which were eventually applied onto the cotton fabric using the padding‐drying‐curing technique. The synthesized ZnO NPs and ZnO‐deposited cotton fabrics were analyzed by various characterization techniques. Including UV–vis, FTIR, BET, XRD, SEM‐EDAX, and TGA analysis. Additionally, the antibacterial effectiveness, washing durability, and mechanical properties of finished cotton (ZOCMC, ZOGMC) and uncoated fabric were investigated. The results indicate that ZOGM and ZOGMC show higher antibacterial efficiency than ZOCM and ZOCMC. Moreover, TGA analysis reveals the amount of ZnO loading before and its retention after multiple washing cycles. ZOGMC exhibits good adherence of NPs and better washing durability than ZOCMC. This study underscores the significance of environmentally friendly green synthesis methods for producing ZnO NPs, showcasing the potential for advancement in healthcare textiles.

Preparation of a bifunctional precursor with antibacterial and flame retardant properties and its application to cotton fabrics

In this article, the superhydrophobic and antibacterial surface on the cotton fabric were fabricated with the UV curable waterborne coatings, the silver nanoparticles, and the stearic acid. The cotton fabric coated with silver stearate was obtained by immersing in a mixture of sodium hydroxide and then modified by stearic acid. Results showed that the water contact angle on the surface of the fabric was 157.6°. The micromorphology and chemical ingredients of the surface of the coating were studied by scanning electron microscope, Fourier transforms infrared spectroscopy, and X photoelectric spectrometer. Results showed that the immersion resulted in a double decomposition reaction and with the modification of the stearic acid, the silver stearate was formed on the surface, which provided a rough surface required for super‐hydrophobicity. And the acid and alkali resistance test, water‐resistance test, and antibacterial activity test indicated that the coating had good acid and alkaline resistance, water‐resistance, and antibacterial properties.

The main objective of this study was to obtain chitosan functionalized viscose fabric with improved antibacterial properties and washing durability. In this regard carboxyl and aldehyde groups, as binding points for irreversible chitosan attachment into/onto viscose fabric, were introduced by two different pretreatments: 2,2,6,6-tetramethylpiperidine-1-oxy radical (TEMPO) oxidation and coating with TEMPO oxidized cellulose nanofibrils (TOCN). The Fourier transform infrared spectroscopy, elemental analysis, zeta potential measurements, scanning electron microscopy, breaking strength and antibacterial testing were used to evaluate the influence of these pretreatments on chitosan binding, but also on chemical, electrokinetic, morphological, mechanical and antibacterial properties of pretreated and chitosan functionalized viscose fabrics. Washing durability of chitosan functionalized viscose was monitored through changes in the chitosan content, electrokinetic and antibacterial properties after multiple washing. TOCN coating improves mechanical properties of fabric, while TEMPO oxidation deteriorates them. The results show that both pretreatments improve chitosan adsorption and thus antibacterial properties, which are highly durable to washing. After five washings, the chitosan functionalized pretreated viscose fabrics preserve their antibacterial activity against Staphylococcus aureus, while antibacterial activity against Escherichia coli was lost. TOCN coated and chitosan functionalized viscose fabric is a high value-added product with simultaneously improved antibacterial and mechanical properties, which may find application as medical textiles.

The prevention of biofilm formation on orthopedic implants is essential, as biofilms are the main challenge in the effective treatment of periprosthetic joint infection (PJI). A silver multilayer (SML) coating was developed to prevent biofilm formation on the implant surface. Previous studies have already demonstrated its antibacterial properties without cytotoxic effects. However, the coating has not been previously tested when applied to common titanium surfaces used in total joint arthroplasty implants. These surfaces often have increased roughness and porosity in the case of cementless implants, which can alter the antibacterial effect of the coating. In this study, we assessed the antibacterial and anti-biofilm properties of the SML coating on corundum-blasted and plasma-sprayed microporous-coated titanium alloy surfaces, using S. aureus, S. epidermidis, and E. coli. An antibacterial activity test following the principles of ISO 22196, ASTM E2180-18, and JIS Z 2801 standards was performed, as well as a biofilm proliferation assay investigating bacterial adhesion and biofilm formation. The SML coating exhibited strong antibacterial effects for all bacterial strains. After 24 h biofilm culture, a >4-log reduction in CFU was induced by the SML coating for S. epidermidis and E. coli on the corundum-blasted and plasma-sprayed microporous-coated titanium surfaces, respectively, when compared to the uncoated surfaces. The coating showed bactericidal properties against Gram-positive bacteria on the corundum-blasted discs. The SML coating on two common titanium surfaces demonstrates significant potential as an effective strategy in combating PJI across a wide range of orthopedic implants.

If pathogens are present in feedstock materials and survive in anaerobic digestion (AD) formulations at 37 °C, they may also survive the AD process to be disseminated in digestate spread on farmland as a fertilizer. The aim of this study was to investigate the prevalence of Salmonella spp., Escherichia coli O157, Listeria monocytogenes, Enterococcus faecalis and Clostridium spp. in AD feed and output materials and survival/growth in four formulations based on food waste, bovine slurry and/or grease-trap waste using International Organization for Standardization (ISO) or equivalent methods. The latter was undertaken in 100 mL Ramboldi tubes, incubated at 37 °C for 10 d with surviving cells enumerated periodically and the T90 values (time to achieve a 1 log reduction) calculated. The prevalence rates for Salmonella spp., Escherichia coli O157, Listeria monocytogenes, Enterococcus faecalis and Clostridium spp. were 3, 0, 5, 11 and 10/13 in food waste, 0, 0, 2, 3 and 2/3 in bovine slurry, 1, 0, 8, 7 and 8/8 in the mixing tank, 5, 1, 17, 18 and 17 /19 in raw digestate and 0, 0, 0, 2 and 2/2 in dried digestate, respectively. Depending on the formulation, T90 values ranged from 1.5 to 2.8 d, 1.6 to 2.8 d, 3.1 to 23.5 d, 2.2 to 6.6 d and 2.4 to 9.1 d for Salmonella Newport, Escherichia coli O157, Listeria monocytogenes, Enterococcus faecalis and Clostridium sporogenes, respectively. It was concluded that AD feed materials may be contaminated with a range of bacterial pathogens and L. monocytogenes may survive for extended periods in the test formulations incubated at 37 °C.

Robust bulk micro-nano hierarchical copper structures possessing exceptional bactericidal efficacy

Multi-drug resistance (MDR) infections are a significant global challenge, necessitating innovative and eco-friendly approaches for developing effective antimicrobial agents. This study focuses on the synthesis, characterization, and evaluation of cerium oxide nanoparticles (CeO2NPs) for their antioxidant, anti-inflammatory, and antibacterial properties. The CeO2NPs were synthesized using aTribulus terrestrisaqueous extract through an environmentally friendly process. Characterization techniques included UV-visible spectroscopy, Fourier Transform Infrared Spectroscopy (FT-IR), x-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Energy Dispersive x-ray (EDX) analysis. The UV-vis spectroscopy shows the presence of peak at 320 nm which confirms the formation of CeO2NPs. The FT-IR analysis of the CeO2NPs revealed several distinct functional groups, with peak values at 3287, 2920, 2340, 1640, 1538, 1066, 714, and 574 cm-1. These peaks correspond to specific functional groups, including C-H stretching in alkynes and alkanes, C=C=O, C=C, alkanes, C-O-C, C-Cl, and C-Br, indicating the presence of diverse chemical bonds within the CeO2NPs. XRD revealed that the nanoparticles were highly crystalline with a face-centered cubic structure, and SEM images showed irregularly shaped, agglomerated particles ranging from 100-150 nm. In terms of biological activity, the synthesized CeO2NPs demonstrated significant antioxidant and anti-inflammatory properties. The nanoparticles exhibited 82.54% antioxidant activity at 100 μg ml-1, closely matching the 83.1% activity of ascorbic acid. Additionally, the CeO2NPs showed 65.2% anti-inflammatory activity at the same concentration, compared to 70.1% for a standard drug. Antibacterial testing revealed that the CeO2NPs were particularly effective against multi-drug resistant strains, includingPseudomonas aeruginosa,Enterococcus faecalis, and MRSA, with moderate activity againstKlebsiella pneumoniae. These findings suggest that CeO2NPs synthesized viaT. terrestrishave strong potential as antimicrobial agents in addressing MDR infections.