Silvertech Ltd

Lecce, Italy

Silvertech Ltd

Lecce, Italy
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Pollini M.,University of Salento | Pollini M.,Silvertech Ltd | Paladini F.,University of Salento | Licciulli A.,University of Salento | And 5 more authors.
Journal of Coatings Technology Research | Year: 2013

In the public transport system, hand-touch surfaces such as seats in buses, trains, trams, and airplanes represent a reservoir of bacteria and a potential risk for contamination among passengers. The antimicrobial activity of silver has been known since ancient times. In this work, natural leather commonly used in the public transport system was treated with silver through the in situ photoreduction of a silver solution. The morphology of the coating and the distribution of silver clusters were studied by scanning electron microscopy and by energy dispersive X-ray spectroscopy. The amount of silver on the surface was quantified by thermo-gravimetric analysis. The antibacterial capability of the treated materials was checked against Gram-positive and Gram-negative bacteria. Taber test was conducted on silver treated samples in order to study the durability of the treatment. The morphology of the silver coating and its antibacterial capability were analyzed also after the Taber test. © 2012 American Coatings Association & Oil and Colour Chemists' Association.

Pollini M.,University of Salento | Pollini M.,Silvertech Ltd. | Paladini F.,University of Salento | Licciulli A.,University of Salento | And 5 more authors.
Journal of Applied Polymer Science | Year: 2012

The use of fabrics with antibacterial properties for commodity applications can provide numerous advantages such as a reduction in the release of odors due to bacterial proliferation in sweat and a reduction in the development of skin hypersensitivity reactions due to microorganisms trapped into the fabrics. Silver is one of the most effective antibacterial agents used for the high degree of biocompatibility and for its long-term antibacterial effectiveness against many different bacterial strains. In this study, an innovative technique for the deposition of nanosilver antibacterial coating on woolen fiber was analyzed. In particular, fabrics woven with different percentages of silver-treated fibers were compared to determine the best ratio preserving the antibacterial activity and optimizing the cost-effectiveness of the final product. Scanning electron microscopy revealed a uniform distribution of silver nanoclusters on the fibers. The impressive silver coating stability and durability were demonstrated after several washing cycles through thermogravimetric analysis. The antimicrobial activity of the silver-treated substrates was evaluated by antibacterial tests on Escherichia coli. A very strong antibacterial activity was found even in presence of the lower silver content; therefore, a blend of coated and uncoated fibers is proposed for practical applications. © 2012 Wiley Periodicals, Inc.

Raho R.,University of Salento | Raho R.,Italian Institute of Technology | Paladini F.,University of Salento | Lombardi F.A.,University of Salento | And 4 more authors.
Materials Science and Engineering C | Year: 2015

Silver nanoparticles (AgNPs) have attracted intensive research interest and have been recently incorporated in polymers, medical devices, hydrogels and burn dressings to control the proliferation of microorganisms. In this study a novel silver antibacterial coating was deposited for the first time on hydrogel fibers through an in-situ photo-chemical reaction. Hydrogel blends obtained by mixing different percentages of silver-treated and untreated fibers were characterized by thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). Four different fluids, such as phosphate buffered saline (PBS), simulated body fluid (SBF), chemical simulated wound fluid (cSWF), and deionized water (DI water), were used for evaluating the swelling properties. The results obtained confirmed that the presence of silver did not affect the properties of the hydrogel. Moreover, the results obtained through inductively coupled plasma mass spectrometry (ICP-MS) demonstrated very low silver release values, thus indicating the perfect adhesion of the silver coating to the substrate. Good antibacterial capabilities were demonstrated by any hydrogel blend on Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) through agar diffusion tests and optical density readings. © 2015 Elsevier B.V.

Pollini M.,University of Salento | Paladini F.,University of Salento | Catalano M.,CNR Institute for Microelectronics and Microsystems | Taurino A.,CNR Institute for Microelectronics and Microsystems | And 5 more authors.
Journal of Materials Science: Materials in Medicine | Year: 2011

Antibacterial coatings on catheters for acute dialysis were obtained by an innovative and patented silver deposition technique based on the photo-reduction of the silver solution on the surface of catheter, with consequent formation of antibacterial silver nanoparticles. Aim of this work is the structural and morphological characterization of these medical devices in order to analyze the distribution and the size of clusters on the polymeric surface, and to verify the antibacterial capability of the devices treated by this technique against bacterial proliferation. The structure and morphology of the silver nanoparticles were investigated by using scanning and transmission electron microscopy. The antimicrobial capability of the catheters after silver deposition was confirmed by antibacterial tests with Escherichia coli. Both scanning electron microscopy analysis and antibacterial tests were performed also after washing catheters for 30 days in deionized water at 37°C, relating these data to thermogravimetric analysis and to energy dispersive spectroscopy, in order to check the resistance of coating and its antimicrobial capability after the maximum time of life of these devices. © Springer Science+Business Media, LLC 2011.

Paladini F.,University of Salento | Cooper I.R.,University of Brighton | Pollini M.,University of Salento | Pollini M.,Silvertech Ltd
Journal of Applied Microbiology | Year: 2014

Aim: The development of silver-coated polyurethane filters as filtration units for the prevention of the respiratory diseases. Methods and Results: An innovative silver deposition technology based on the photo-reduction in a silver salt was adopted. The efficacy of the technology in providing a homogeneous distribution of the silver particles was verified by scanning electron microscopy and energy dispersive X-ray spectroscopy. The materials were tested through microbiological procedures used in industry to verify the efficacy of the silver-coated filters on the viability and growth of selected micro-organisms. Direct inoculation test, filtration experiment and shaking tests were performed on microbial human pathogens associated with air filtration units and respiratory disease, namely Legionella pneumophila, Pseudomonas aeruginosa, Aspergillus niger and Aspergillus flavus, by adopting Escherichia coli and Staphylococcus aureus as control organisms. Conclusions: The results provided evidence of the effectiveness of the silver coating in reducing the bioaerosolization of viable human pathogens into environments using recirculated air. Significance and Impact of the Study: Micro-organisms can affect the air quality in indoor environments and can be responsible for infectious, allergic or toxic disturbances on human airways. The development of an adequate bioaerosol control might ameliorate a positive health effect in humans. © 2013 The Society for Applied Microbiology.

Cooper I.R.,University of Brighton | Pollini M.,University of Salento | Pollini M.,Silvertech Ltd | Paladini F.,University of Salento
Materials Science and Engineering C | Year: 2016

Catheter-associated urinary tract infection (CAUTI) represents one of the most common causes of morbidity and mortality. The resistance demonstrated by many microorganisms to conventional antibiotic therapies and the increasing health-care costs have recently encouraged the definition of alternative preventive strategies, which can have a positive effect in the management of infections. Antimicrobial urinary catheters have been developed through the photo-chemical deposition of silver coatings on the external and luminal surfaces. The substrates are exposed to ultraviolet radiation after impregnation into a silver-based solution, thus inducing the in situ synthesis of silver particles. The effect of the surface treatment on the material was investigated through scanning electron microscopy (SEM) and silver ion release measurements. The ability of microorganisms commonly associated with urinary tract infections was investigated in terms of bacterial viability, proliferation and biofilm development, using Escherichia coli, Klebsiella pneumoniae and Proteus mirabilis as target organisms. The silver coatings demonstrated good distribution of silver particles to the substrate, and proved an effective antibacterial capability in simulated biological conditions. The low values of silver ion release demonstrated the optimum adhesion of the coating. The results indicated a good potential of silver-based antimicrobial materials for prevention of catheter-associated urinary tract infection. © 2016

Paladini F.,University of Salento | Sannino A.,University of Salento | Sannino A.,Silvertech Ltd | Pollini M.,University of Salento | Pollini M.,Silvertech Ltd
Journal of Biomedical Materials Research - Part B Applied Biomaterials | Year: 2014

Textiles are a fertile breeding ground for a multitude of micro-organisms under appropriate conditions of moisture and temperature. The broad-spectrum biocide properties of silver are well known and many technologies have been developed so far to treat textiles with silver. The efficacy of the silver deposition technology presented in this article has been already demonstrated in previous works, where the strong adhesion of silver nanoparticles to the substrate and their antibacterial capability have been assessed. This work focuses on the evaluation of any possible interaction of silver treated cotton with human skin, in terms of skin irritation and hypoallergenicity. Moreover, the presence of silver and the antibacterial capability against Gram positive and Gram negative bacteria, namely Staphylococcus aureus and Escherichia coli, were verified even after several washing cycles in order to develop a product with long-term antibacterial capability and no adverse effects in terms of skin irritation and hypoallergenicity. © 2013 Wiley Periodicals, Inc.

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