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The Efficiency of Biocidal Silica Nanosystems for the Conservation of Stone Monuments: Comparative In Vitro Tests against Epilithic Green Algae
Applied Sciences ( IF 2.838 ) Pub Date : 2021-07-24 , DOI: 10.3390/app11156804
Flavia Bartoli , Martina Zuena , Armida Sodo , Giulia Caneva

In the last decade, worldwide research has focused on innovative natural biocides and the development of organic and inorganic nanomaterials for long-lasting reliability. In this work, the biocide effects of two different biocides encapsulated in two different silica nanosystems for a multifunctional coating have been performed through in vitro tests, by using Chlorococcum sp. as a common stone biodeteriogen. Zosteric sodium salt (ZS), a green biocide, was compared with the commercial biocide, 2-mercaptobenzothiazole (MBT), widely used in the treatment of cultural heritage. The analyzed systems are the following: silica nanocapsules (NC) and silica nanoparticles (MNP) not loaded with biocides, two nanosystems loaded with ZS and MBT, and free biocides. The qualitative and quantitative evaluations of biocide efficiency were performed periodically, analyzing pigment autofluorescence to discriminate between active and inactive/dead cells. The analyses showed multiple differences. All the nanocontainers presented an initial reduction in chlorophyll’s autofluorescence. For the free biocide, the results highlighted higher efficiency for MBT than ZS. Finally, the nanosystems loaded with the different biocides highlighted a higher activity for nanocontainers loaded with the commercial biocide than the green product, and better efficiency for MNP in comparison with NC.

中文翻译:

生物杀灭二氧化硅纳米系统在保护石材纪念碑方面的效率:对表生绿藻的体外比较试验

在过去的十年中,世界范围内的研究集中在创新的天然杀菌剂和有机和无机纳米材料的开发上,以实现持久的可靠性。在这项工作中,通过使用绿球菌的体外测试,已对封装在两种不同二氧化硅纳米系统中用于多功能涂层的两种不同杀菌剂的杀菌作用进行了研究。sp. 作为一种常见的石材生物去污剂。带状钠盐 (ZS) 是一种绿色杀菌剂,与商业杀菌剂 2-巯基苯并噻唑 (MBT) 进行了比较,后者广泛用于处理文化遗产。分析的系统如下:未加载杀生物剂的二氧化硅纳米胶囊 (NC) 和二氧化硅纳米粒子 (MNP)、加载有 ZS 和 MBT 的两个纳米系统以及游离杀生物剂。定期进行杀菌剂效率的定性和定量评估,分析色素自发荧光以区分活性和非活性/死细胞。分析显示出多重差异。所有纳米容器都表现出叶绿素自发荧光的初始减少。对于游离杀生物剂,结果表明 MBT 的效率高于 ZS。最后,
更新日期:2021-07-24
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