Oxidative Inactivation of SARS-CoV-2 on Photoactive AgNPs@TiO2 Ceramic Tiles

The current SARS-CoV-2 pandemic causes serious public health, social, and economic issues all over the globe. Surface transmission has been claimed as a possible SARS-CoV-2 infection route, especially in heavy contaminated environmental surfaces, including hospitals and crowded public places. Herein, we studied the deactivation of SARS-CoV-2 on photoactive AgNPs@TiO2 coated on industrial ceramic tiles under dark, UVA, and LED light irradiations. SARS-CoV-2 inactivation is effective under any light/dark conditions. The presence of AgNPs has an important key to limit the survival of SARS-CoV-2 in the dark; moreover, there is a synergistic action when TiO2 is decorated with Ag to enhance the virus photocatalytic inactivation even under LED. The radical oxidation was confirmed as the the central mechanism behind SARS-CoV-2 damage/inactivation by ESR analysis under LED light. Therefore, photoactive AgNPs@TiO2 ceramic tiles could be exploited to fight surface infections, especially during viral severe pandemics.

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Fabrication of carbon quantum dots/1D MoO3-x hybrid junction with enhanced LED light efficiency in photocatalytic inactivation of E. coli and S. aureus

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2020.155410 ◽

2020 ◽

Vol 836 ◽

pp. 155410 ◽

Cited By ~ 2

Author(s):

Yeping Li ◽

Chaobao Wang ◽

Liying Huang ◽

Fei Zhang ◽

Hao Wang ◽

...

Keyword(s):

Quantum Dots ◽

Carbon Quantum Dots ◽

Led Light ◽

E Coli ◽

Photocatalytic Inactivation ◽

Hybrid Junction ◽

Light Efficiency

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Validation of FoodChek™ - Salmonella for Rapid Detection of Salmonella in Eggs, Derivative Products, and the Environment

Journal of AOAC International ◽

10.5740/jaoacint.15-0228 ◽

2016 ◽

Vol 99 (1) ◽

pp. 82-97 ◽

Cited By ~ 1

Author(s):

Melissa Buzinhani ◽

Renaud Tremblay ◽

Gabriela Martinez ◽

Michael Giuffre ◽

Thomas Hammack ◽

...

Keyword(s):

Rapid Detection ◽

Method Comparison ◽

Cross Reactivity ◽

Ceramic Tiles ◽

Salmonella Spp ◽

Environmental Surfaces ◽

Study Results ◽

The Matrix ◽

Salmonella Assay ◽

Derivative Products

Abstract The FoodChek™ - Salmonella assay is an immunomagnetic lateral flow assay for the rapid detection (shorter than 24 h) of the most frequently isolated Salmonella (groups B–E) in eggs, egg-derivative products, and environmental surfaces. The FoodChek - Salmonella assay correctly identified 99.6% (239/240) of the samples tested in the matrix studied, and the statistical analysis of the method comparison study results demonstrated that it performs as well as U.S. culture-based reference methods. Ninety-nine percent of the 103 Salmonella strains tested belonging to serogroups B–E were detected during the inclusivity study. Concerning the exclusivity, 31 nontarget strains were tested. No cross-reactivity was observed in FoodChek - Salmonella assay enrichment conditions. In addition, the assay shows strong robustness, good stability, and consistency among lots. The present study proves that the assay is an effective tool for the rapid detection of Salmonella spp. in whole liquid eggs, liquid egg white (liquid egg albumen), shell eggs, dried whole eggs, dried egg yolks, and environmental surfaces as stainless steel, plastic, rubber, ceramic tiles, and sealed concrete.

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DEVELOPMENT OF A METHODOLOGICAL APPROACH TO THE DEVELOPMENT OF BACTERICIDAL GLAZES FOR CERAMIC TILES

Municipal economy of cities ◽

10.33042/2522-1809-2020-1-154-71-76 ◽

2020 ◽

Vol 1 (154) ◽

pp. 71-76

Author(s):

О. Savvova ◽

G. Voronov ◽

О. Fesenko ◽

Y. Afanasenko

Keyword(s):

Methodological Approach ◽

Ceramic Materials ◽

Inhibitory Effect ◽

Diffusion Method ◽

Ceramic Tiles ◽

Public Places ◽

Colony Forming Units ◽

Living Organisms ◽

Covalently Linked ◽

Bactericidal Agent

The aim of this work is developing a methodological approach to obtaining of bactericidal glazes for ceramic tiles. In this paper were identified the factors that determine the necessity of the development and implementation of bactericidal ceramic materials to protect public places. The most common methods of increasing biological resistance to the materials are described, namely: impregnation or surface treatment of materials with bactericidal liquids, regulation of materials surface properties, or injection of a bactericidal agent. The effect of the nature and particle size of the agent on its bactericidal properties are described. The main stages of the development of biocidal glass coatings (glazes), are identified, which include: the choice of a bactericidal agent and a glass matrix, a comprehensive assessment of the structure, physicochemical and service properties of the glaze and analysis of microbiological standards for evaluating the effectiveness of the inhibitory effect of glass coatings. It was established that existing methods for evaluating the bactericidal action should be adapted in accordance with existing sanitary standards for the operation of ceramic tiles. In this regard, to simulate the infection contamination of glass coatings, it is necessary: firstly, to use Escherichia coli as a test bioculture and to determine the range of permissible concentrations of colony forming units, and secondly, to use a qualitative diffusion method for migrating compounds and quantitative (aerosol and counting) methods for covalently linked bactericidal agents. Taking into account the constantly increasing anthropogenic environmental contamination, the toxic effect of bactericidal agents on living organisms, the biological activity of metals in the human body and their effect on the properties of glazes, it was determined that the oxides Ca, Mg, Zn, Ti, Cu, Cr, Mn, Ni are optimal biocidal agents as well as some of their salts. A methodological approach was developed that allows the development of prolonged-action bactericidal glazes for ceramic tiles under epidemiological threats. Keywords: glaze, ceramic materials, bactericidal agents, pathogenic microorganism.

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