Enhanced antibacterial activity of acid treated MgO nanoparticles on <i>Escherichia coli</i>

Li, Xiaohua; Hong, Xiaoyu; Yang, Yan; Zhao, Jiao; Diko, Catherine Sekyerebea; Zhu, Yimin

doi:10.1039/d1ra06221b

Cited by 7 publications

(4 citation statements)

References 39 publications

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“…XRD patterns of the MgO NPs were observed at 36.88°, 42.79°, 62.24°, 74.63°, and 78.51°, which were respectively assigned to (111), (200), (220), (311), and (222) Bragg peaks in the MgO standard (JCPDS no. 45–0946) , (Figure A). Diffraction peaks at 38.18° and 58.88° were only found in the commercial MgO NPs, which corresponded to (101) and (102) planes in the hexagonal structure of Mg(OH) 2 (Figure B) .…”

Section: Resultsmentioning

confidence: 99%

“…11 Therefore, high OV contents on a particle's surface can be expected to produce a high antibacterial efficiency. Previous strategies to manipulate OVs of MgO NPs include the use of calcination temperature, 12 oxygen-deficient calcination, 13 divalent transition metal ion doping, 14 rodshaped particles, 11 hydrochloric acid treatment, 15 method with dominant {001} facets, 10 or different synthesis routes, 16 and these showed enhanced antibacterial activity owing to high OV contents. However, few studies compared the antibacterial efficiency of those NPs with currently available MgO NPs to evaluate their competitiveness.…”

Section: •−mentioning

confidence: 99%

“…However, few studies compared the antibacterial efficiency of those NPs with currently available MgO NPs to evaluate their competitiveness. 10,15 Decreased contact surface area of MgO NPs to bacteria might diminish the advantage when they were incorporated into polymer films for packaging applications, while none of the above-mentioned studies further proved the competitiveness. Petroleum-based polymers, or so-called plastics, have been widely used in human lives since the mid-20th century.…”

Section: •−mentioning

confidence: 99%

“…Therefore, high OV contents on a particle’s surface can be expected to produce a high antibacterial efficiency. Previous strategies to manipulate OVs of MgO NPs include the use of calcination temperature, oxygen-deficient calcination, divalent transition metal ion doping, rod-shaped particles, hydrochloric acid treatment, combustion method with dominant {001} facets, or different synthesis routes, and these showed enhanced antibacterial activity owing to high OV contents. However, few studies compared the antibacterial efficiency of those NPs with currently available MgO NPs to evaluate their competitiveness. , Decreased contact surface area of MgO NPs to bacteria might diminish the advantage when they were incorporated into polymer films for packaging applications, while none of the above-mentioned studies further proved the competitiveness.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Antibacterial Activity in Cellulose Acetate Films with Surface Defect-Rich MgO Nanoparticles for Sustainable Active Packaging Applications

Kuo,

Lin,

Lin

et al. 2023

ACS Appl. Nano Mater.

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Magnesium oxide nanoparticles (MgO NPs) are one of the popular inorganic nanomaterials used for active food packaging applications, mainly due to their antimicrobial activity. Previous studies have utilized various strategies to enhance the activity by increasing surface oxygen vacancies of MgO. However, only a few of them showed competitive advantages over commercial ones. It is doubtful that when incorporated into biodegradable polymer films, these NPs still show superior antimicrobial activities and other beneficial properties. The present study synthesized a series of MgO NPs by a urea-based hydrothermal method and found that two of the surface defect-rich, {111} facet NPs released higher amounts of superoxide anions, exhibiting greater antibacterial effects against Escherichia coli and Staphylococcus aureus than those by commercial 27 nm MgO NPs. One using nitrogen calcination at 650 °C with better antibacterial activity was selected for incorporation into cellulose acetate (CA), and we found that the as-prepared 8% MgO NP-incorporated CA exhibited better antibacterial activity against S. aureus than the commercial one, while they had similar activities against E. coli. The incorporation of as-prepared MgO NPs into CA increased the tensile strength by 27% and the water vapor transmission rate (WVTR) by 29.5% compared to pristine CA, even though the tensile strength, thermal properties, and water and oxygen barrier properties, of the asprepared nanocomposite did not further improve compared to that of the commercial one. These results suggest the use of our developed MgO NPs and the CA-MgO NP nanocomposite in sustainable active packaging applications.

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Section: Resultsmentioning

confidence: 99%