Department of Industrial Engineering, University of Trento, Via Sommarive 9, 38123, Trento, Italy.
Department of Medical Sciences and Public Health, University of Cagliari, S.P.8 Monserrato, 09042, Cagliari, Italy.
Appl Microbiol Biotechnol. 2023 Oct;107(19):5975-5986. doi: 10.1007/s00253-023-12710-1. Epub 2023 Aug 8.
This work aims to represent a standard application for understanding the extent of the antibacterial efficacy of coatings with different amounts of colloidal silver on wooden surfaces over time. The key variable that was intended to be evaluated in this study was the "time efficiency," with concerns about the possible efficacy in the durability of the surfaces. By highlighting the "expiry date" of the agents, as in the case with other products, the study aimed to confirm the validity of the simulation tests conducted in the laboratory with degradation tests. Furthermore, the role of the silver amount on the barrier performance of the coatings was assessed by liquid resistance, water uptake, and perspiration tests, evaluating the aesthetic durability of the coatings by means of colorimetric analyses. Ultimately, this work demonstrates that these coatings may represent alternatives in terms of prolonged antimicrobial activity when compared with the biocide agents currently in use, capable to offer good resistance to detergent solutions and to water. Nevertheless, due to silver's susceptibility to extended exposure to acidic solutions, the findings of the research discourage the utilization of colloidal silver in wood paints intended for use in public settings. KEY POINTS: • Colloidal silver does not alter the deposition process and does not introduce defects in the wood paint. • Coatings containing silver show high antimicrobial activity over time, against both E.coli and S.aureus. • The silver-based filler resists contact with detergents and aqueous solutions but suffers oxidation processes in acidic environments.
这项工作旨在展示一种标准的应用程序，用于了解随着时间的推移，不同含量的胶体银在木质表面上的抗菌效果。本研究旨在评估的关键变量是“时效”，同时关注表面耐久性方面的可能效果。通过突出“保质期”，就像其他产品一样，该研究旨在通过降解试验来确认实验室模拟试验的有效性。此外，通过液体阻力、吸水率和出汗试验评估了涂层的阻隔性能，通过比色分析评估了涂层的美观耐久性。最终，这项工作表明，与目前使用的杀生物剂相比，这些涂层在延长抗菌活性方面可能是一种替代方案，能够提供对洗涤剂溶液和水的良好抵抗力。然而，由于银容易受到酸性溶液的长时间暴露，研究结果不鼓励在用于公共场所的木材涂料中使用胶体银。要点：• 胶体银不会改变沉积过程，也不会在木材涂料中引入缺陷。• 含银的涂料具有很高的抗菌活性，随着时间的推移，对大肠杆菌和金黄色葡萄球菌都有效。• 基于银的填充剂能抵抗与洗涤剂和水溶液的接触，但在酸性环境中会发生氧化过程。
