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Combined effect of ultrasound stimulations and autoclaving on the enhancement of antibacterial activity of ZnO and SiO₂/ZnO nanoparticles

Hajer Rokbani, France Daigle and Abdellah Ajji

Article (2018)

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Cite this document: Rokbani, H., Daigle, F. & Ajji, A. (2018). Combined effect of ultrasound stimulations and autoclaving on the enhancement of antibacterial activity of ZnO and SiO₂/ZnO nanoparticles. Nanomaterials, 8(3). doi:10.3390/nano8030129
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This study investigates the antibacterial activity (ABA) of suspensions of pure ZnO nanoparticles (ZnO-NPs) and mesoporous silica doped with ZnO (ZnO-UVM7), as well as electrospun nanofibers containing those nanoparticles. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of these two materials were also determined under the same conditions. The results showed a concentration-dependent effect of antibacterial nanoparticles on the viability of Escherichia coli (E. coli). Moreover, the combination of the stimulations and sterilization considerably enhanced the antimicrobial activity (AMA) of the ZnO suspensions. Poly (lactic acid) (PLA) solutions in 2,2,2-trifluoroethanol (TFE) were mixed with different contents of nanoparticles and spun into nonwoven mats by the electrospinning process. The morphology of the mats was analyzed by scanning electron microscopy (SEM). The amount of nanoparticles contained in the mats was determined by thermogravimetric analysis (TGA). The obtained PLA-based mats showed a fibrous morphology, with an average diameter ranging from 350 to 450 nm, a porosity above 85%, but with the nanoparticles agglomeration on their surface. TGA analysis showed that the loss of ZnO-NPs increased with the increase of ZnO-NPs content in the PLA solutions and reached 79% for 1 wt % of ZnO-NPs, which was mainly due to the aggregation of nanoparticles in solution. The ABA of the obtained PLA mats was evaluated by the dynamic method according to the ASTM standard E2149. The results showed that, above an optimal concentration, the nanoparticle agglomeration reduced the antimicrobial efficiency of PLA mats. These mats have potential features for use as antimicrobial food packaging material.

Uncontrolled Keywords

E. coli; ZnO nanoparticles; antibacterial properties; electrospinning process; poly (lactic acid)

Open Access document in PolyPublie
Subjects: 1800 Génie chimique > 1800 Génie chimique
3700 Chimie organique > 3705 Chimie bio-organique
5200 Microbiologie > 5201 Bactériologie
Department: Département de génie chimique
Research Center: CREPEC - Centre de recherche sur les systèmes polymères et composites à haute performance
Date Deposited: 09 Mar 2020 11:51
Last Modified: 08 Apr 2021 10:42
PolyPublie URL: https://publications.polymtl.ca/3573/
Document issued by the official publisher
Journal Title: Nanomaterials (vol. 8, no. 3)
Publisher: MDPI
Official URL: https://doi.org/10.3390/nano8030129


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