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

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 newest learn findings. It compares 3 types of AgNPs with reference to their antibacterial and antiviral results; their sustainability in genuine water matrices; and their antiviral mechanisms. the result of this learn equips the water with a greater figuring out of the means, quantity and mechanisms of nanosilver disinfection. it truly is of curiosity to graduate scholars, teachers and researchers within the quarter of nanotechnology and environmental engineering.

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Through study of various combinations of ubiquitous cations and anions on bacterial inactivation of AgNPs, Jin’s team found that presence of Ca2+/Mg2+ ions slightly enhanced the antibacterial performance of nanosilver. Such observation was attributed to these divalent cations being able to form “ion bridge” between negatively-charged AgNPs and lipopolysaccharide (LPS) on cell membrane. The latter is also negatively charged for gram-negative bacteria, Pseudomonas putida, used in their study. It was thought that such electrostatic interaction might change the cell membrane permeability and facilitate the transfer of silver nanoparticles into the cells that enabled more AgNPs access to sites of action.

Coli E. coli E. coli E. 1 Summary of literature on the antimicrobial and antiviral effects of AgNPs Ag+ was better than AgNPs in antimicrobial performance Ag+ was better than AgNPs in antimicrobial performance AgNPs <10 nm attached to cell membrane. {111} was reported to be significant Bio-AgNPs. Antibacterial capacity of AgNPs was similar to Ag+ Ag+ was better than AgNPs in antimicrobial performance Ag+ was better than AgNPs in antimicrobial performance Ag@Magnetic hybrid colloids Sphere/rod/triangular AgNPs.

Nevertheless, it is still worth mentioning that wet chemistry method is by far the most mature and commonly used technique for fabricating AgNPs, considering the capital cost, scalability and feasibility of application (Majdalawieh et al. 2014). Comparison of chem- and bio-synthesis poses two distinct options: chemical synthesis benefits from finely control of shape/size and monodispersity while biological synthesis benefits from green process and that biomass may serve as a better stabilizing agent.

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