Journal
COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 184, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfb.2019.110522
Keywords
Isonicotinylhydrazide; Polyoxometalates; Silver nanoparticles; Antimicrobial; Nanozyme; Cytotoxicity
Funding
- Rao Bahaddur Dharma Pravartha Gubbi Thotadappa Charities (RBDGTC), Bengaluru, India
- Japan Science and Technology (JST) Agency, Japan toward Asia Youth Exchange Program in Science (Sakura Exchange Program)
- Centre for Advanced Materials and Industrial Chemistry (CAMIC) at the School of Sciences, RMIT University, Australia
- National Institutes of Health (NIH) [AI13477]
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With the rapidly approaching post-antibiotic era, new and effective combinations of antibiotics are imperative to combat multiple drug resistance (MDR). We have synthesized multimodal antimicrobials that integrate the antibiotic isonicotinylhydrazide (INH), silver nanoparticles (AgNPs(INH)), and two different polyoxometalates (POMs) namely, phosphotungstic acid (PTA) and phosphomolybdic acid (PMA) to prepare AgNPs(INH@PTA) and AgNPs(INH@PMA), respectively. AgNPs(INH) have peroxidase-like (nanozyme) activity and very high antibacterial potential toward S. aureus, which was further enhanced upon modification with POMs. The selectivity of these functional nanozymes was evaluated with m5S mouse fibroblasts using WST-8, LDH viability, in vitro reactive oxygen species (ROS) generation assays, and crystal violet morphological studies. These investigations showed very low cytotoxicity for the nanoparticles compared to free metal ions (Ag+), pristine POMs and INH, demonstrating the ability of multifunctional materials to provide efficient and selective antimicrobials.
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