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Antibacterial activity of mixed metal oxide derived from Zn-Al layered double hydroxide precursors, effect of calcination temperature

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Abstract 

For several decades, the use of antibiotics has led to the emergence of highly resistant human and animal pathogens, posing a significant threat to global health, food security, and economic progress. In the quest for alternatives to combat multidrug-resistant bacteria and yeasts, the utilization of nanoparticles materials has emerged as a promising avenue. In this research, we investigated the antimicrobial properties of Zn-Al-layered double hydroxide, synthesized through co-precipitation and subsequently calcined at temperatures of 400, 600, and 800°C. A total of 21 bacterial strains, including 15 clinical strains and 6 Gram-reference strains, along with one fungal strain, were subjected to testing. The synthesized materials underwent characterization using various techniques such as X-ray diffraction (XRD) spectroscopy, scanning electron microscopy (SEM), ultraviolet–visible spectroscopy, and fourier-transform infrared (FTIR) spectroscopy. The key findings indicate that the uncalcined Zn-Al-layered double hydroxide and the heterojunction ZnO-ZnAl2O4 calcined at 400°C and 600°C exhibited a minimum inhibitory concentration (MIC) of 0.125 μg/mL against the tested strains. The spinell ZnAl2O4 calcined at 800°C showed MICs ranging between 0.125 and 2 μg/mL, with a greater bactericidal effect on gram-negative bacteria (GNBs) such as Enterobacteriaceae and non-Enterobacteriaceae compared to Gram-positive bacteria. Consequently, the heterojunction ZnO-ZnAl2O4 demonstrated higher efficacy against Gram-positive bacteria. These findings highlight the potential of heterojunction ZnO-ZnAl2O4 and spinell ZnAl2O4 as mixed metal oxides derived from ZnAl-layered double hydroxide, offering promising alternatives to traditional antibiotics and suggesting their potential use as impregnating agents in matrices with a broad spectrum of specific antimicrobial activity.

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Data availability

All data and materials used in this study are available within this article.

Abbreviations

S.M:

Supplementary material

XRD:

X-ray Diffraction Spectroscopy

FTIR:

Fourier-Transform Infrared Spectroscopy.

SEM:

Scanning Electron Microscopy

UV–Vis:

Ultraviolet Visible Spectroscopy

NPs:

Nanoparticles

ROS:

Reactive Oxygen Species

LDH:

Layered Double Hydroxide

MMO:

Mixed Metal Oxide

MIC:

Minimum Inhibitory Concentration

MBC:

Minimum Bactericidal Concentration

GNB:

Gram-negative bacteria

ATCC:

American Type Culture Collection

CFU:

Colony Forming Unit

PCD:

Programmed Cell Death

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Authors

Contributions

Each author participated sufficiently in the work. AD, ZB and KB supervision; FG, TB, YM, I B, AC, BA, BA, HB, and OLconceptualization, methodology, writing—original draft preparation, formal analysis and investigation, writing—review and editing.All authors reviewed the manuscript.

Corresponding author

Correspondence to Okba Louafi.

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The authors declare no competing interests.

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Ghribi, F., Bouarroudj, T., Messai, Y. et al. Antibacterial activity of mixed metal oxide derived from Zn-Al layered double hydroxide precursors, effect of calcination temperature. Biologia 79, 937–952 (2024). https://doi.org/10.1007/s11756-023-01589-y

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  • DOI: https://doi.org/10.1007/s11756-023-01589-y

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