A Study on Antimicrobial Effects of Nanosilver for Drinking by Xu Yang

By Xu Yang

This thesis examines the feasibility of utilizing silver nanoparticles (AgNPs) as a manageable disinfectant. It explores the possibilities and demanding situations of utilizing AgNPs as an antimicrobial agent, and comprises the most recent study findings. It compares 3 different types of AgNPs in regards to their antibacterial and antiviral results; their sustainability in genuine water matrices; and their antiviral mechanisms. the end result of this examine equips the water with a greater realizing of the potential, quantity and mechanisms of nanosilver disinfection. it truly is of curiosity to graduate scholars, teachers and researchers within the region of nanotechnology and environmental engineering.

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Additional info for A Study on Antimicrobial Effects of Nanosilver for Drinking Water Disinfection

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Hwang concluded that AgNPs (including Ag+ released) caused toxicity via protein and membrane damage but did not induce DNA damage. Systematic study of antibacterial activities of AgNPs was not investigated until the advent of Sintubin et al. (2011). In their study, Sintubin and co-workers investigated independently three commonly proposed mechanisms behind antibacterial activities of AgNPs, namely release of Ag+, generation of ROS and direct contact (Sintubin et al. 2011). In order to study the contribution of Ag+ release, minimal inhibition concentration (MIC) and minimal bactericidal concentration (MBC) and log removal of bacteria were determined and compared between AgNPs and Ag+.

In supporting material of El Badawy et al. e. removing Ag+ from nanosilver) was not explicitly mentioned. Therefore, it is difficult to investigate the roles of Ag+ and AgNPs respectively and determine the main cause to which the observed microbial damages were responsible. Though it was difficult to distinguish the contributions of NP from that of ions, Fabrega and co-workers managed to find some evidence for the existence of AgNPs’ ‘extra’ effects (Fabrega et al. 2009). It was found that introducing the humic substances into the system was able to mitigate the bactericidal effect of AgNPs, yet had no impacts on toxicity of silver ions.

Coli as a model for Gram-negative bacteria. J Colloid Interface Sci 275:177–182 Sondi I, Goia DV, Matijević E (2003) Preparation of highly concentrated stable dispersions of uniform silver nanoparticles. J Colloid Interface Sci 260:75–81 Stoimenov PK, Klinger RL, Marchin GL, Klabunde KJ (2002) Metal oxide nanoparticles as bactericidal agents. Langmuir 18:6679–6686 Sun YG, Xia YN (2002) Shape-controlled synthesis of gold and silver nanoparticles. Science 298:2176–2179 Veerasamy R, Xin TZ, Gunasagaran S, Xiang TFW, Yang EFC, Jeyakumar N, Dhanaraj SA (2011) Biosynthesis of silver nanoparticles using mangosteen leaf extract and evaluation of their antimicrobial activities.

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