How do silver-hydrogen nanotubes kill bacteria?

These nanotubes work through dual action: they physically damage bacterial cell membranes and interfere with essential proteins inside the bacteria. The hydrogen component helps the nanotubes attach to bacteria, while silver particles destroy them.

What percentage of bacteria were killed in this study?

The silver-decorated hydrogen nanotubes killed 75.7% of bacteria and reduced biofilm formation by 77.7%. They also showed 64.3% effectiveness in destroying existing biofilms.

Are hydrogen nanotubes effective without silver?

No, plain hydrogen molybdenum bronze nanotubes showed no antibacterial effects on their own. The silver decoration is essential for the antimicrobial activity.

Could these nanotubes help fight antibiotic-resistant infections?

Yes, these nanotubes show promise against biofilm-forming bacteria that resist traditional antibiotics. Their dual mechanism of action could overcome bacterial resistance strategies.

What bacteria were tested in this research?

The study specifically tested Bacillus subtilis, a common bacteria that forms protective biofilms. This bacteria is relevant for both clinical infections and industrial contamination problems.

Silver-Hydrogen Nanotubes Kill Antibiotic-Resistant Bacteria

Authors: Shabnam Yavari, Neda Eghtesadi, Kayode Olaifa, Darya Shafiee, Amir H Montazer, Reza Rasuli, Ebrahim Nemati-Kande, Forough Pakzadi, Sorour Faramarzi, Mehdi Shafiee
Journal: Bioinorganic Chemistry and Applications
Year: 2026
DOI: 10.1155/bca/9270509
Study Type: Cell Culture
Outcome: Positive
Peer Reviewed: Yes
Country: Kazakhstan
Health Condition: Bacterial Infections
Body System: Immune System

TL;DR

Silver-decorated hydrogen molybdenum bronze nanotubes showed strong antibacterial and anti-biofilm activity by damaging bacterial membranes and interfering with key cellular proteins.

Key Finding

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Summary

This study developed hydrogen molybdenum bronze nanosheets and silver-decorated nanotube derivatives and evaluated their antibacterial effects against Bacillus subtilis. While the base nanosheets were biologically inert, the silver-decorated nanotubes significantly inhibited planktonic growth, reduced biofilm formation, and partially eradicated established biofilms. Microscopy revealed membrane damage and biofilm disruption, consistent with oxidative stress and metal ion–mediated injury. Computational modeling further suggested that the materials interact with essential bacterial proteins involved in cell wall synthesis and cell division, forming stable noncovalent complexes. Together, these findings indicate that silver-decorated nanotubes exert antibacterial effects through combined membrane destabilization and intracellular protein interference, highlighting their potential for industrial biofilm control applications.

Abstract

Bacterial biofilms are a persistent challenge in industrial settings such as water treatment and food processing, contributing to antimicrobial resistance, operational inefficiencies, and environmental burden. Here, we report on the synthesis and multiscale evaluation of hydrogen molybdenum bronze nanosheets (HMB-NSHs) and their silver-decorated nanotube derivatives (Ag-decorated HMB-NTs), produced via an arc discharge method. High-resolution structural analyses revealed crystalline, ultrathin HMB sheets and tubular architectures adorned with uniformly distributed Ag nanoparticles (∼3-5 nm). While HMB-NSHs were biologically inert, Ag-decorated HMB-NTs demonstrated potent antibacterial effects against Bacillus subtilis, inhibiting planktonic growth (75.7%), biofilm formation (77.7%), and biofilm eradication (64.3%) at 25 μg/mL. Complementary SEM and fluorescence microscopy visualizations revealed pronounced morphological membrane damage such as wrinkling, roughening, and biofilm reduction signatures absent in control and HMB-treated samples, facilitating metal ion deposition and localized oxidative stress. At the molecular level, multiscale computational modeling, including molecular docking, DFT, QTAIM, RDG, and IGM analyses, provided atomic-resolution insights into dual-site antibacterial action. The Ag and HMB moieties interact favorably with both the cell-wall penicillin-binding protein (PDB ID: 4WO7) and intracellular division regulator FtsZ (PDB ID: 2VAM), forming energetically stable complexes. QTAIM metrics confirmed extensive van der Waals and hydrogen bonding networks with 4WO7, whereas RDG and IGM surfaces visualized dense noncovalent contact regions. Ag-FtsZ interactions, though weaker, suggest possible disruption of cell cycle machinery upon internalization. These findings establish Ag-decorated HMB-NTs as a dual-function nanomaterial: HMB scaffolds promote surface adhesion and stability, whereas Ag enables membrane destabilization and intracellular disruption. Together, these processes highlight membrane damage and protein interference as the primary antibacterial mechanisms, underscoring their potential as a next-generation antibacterial platform, particularly against biofilm-forming and industrially relevant bacteria such as Bacillus subtilis.