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Article

Preparation and Enhanced Antimicrobial Activity of Thymol Immobilized on Different Silica Nanoparticles with Application in Apple Juice

1
College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China
2
Laboratory of Quality & Safety Risk Assessment for Aquatic Products on Storage and Preservation, College of Food Science and Technology, Ministry of Agriculture and Shanghai Engineering Research Center of Aquatic-Product Processing & Preservation, Shanghai Ocean University, Shanghai 200120, China
3
Department of Chemistry, Shanghai Ocean University, Shanghai 201306, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Antonia Nostro
Coatings 2022, 12(5), 671; https://doi.org/10.3390/coatings12050671
Received: 28 February 2022 / Revised: 29 April 2022 / Accepted: 29 April 2022 / Published: 14 May 2022
(This article belongs to the Special Issue Surface Modified Nanoparticles: For Gas and Chemical Sensors)
In order to diminish the application limitations of essential oils (EOs) as natural antimicrobial components in the food industry, novel antimicrobial materials were designed and prepared by immobilization of thymol derivatives on silica particles with different morphologies (hollow mesoporous silica nanoparticles, MCM-41, amorphous silica). The structural characteristics of antimicrobial materials were estimated by FESEM, FT-IR, TGA, N2 adsorption-desorption, and small-angle XRD, and the results revealed that both mesoporous silica nanoparticles maintained the orderly structures and had good immobilization yield. Furthermore, the antibacterial performance tests showed that mesoporous silica nanoparticles greatly enhanced the antimicrobial activity of thymol against two representative foodborne bacteria (Escherichia coli and Staphylococcus aureus), and the application of the antimicrobial support was tested in apple juices inoculated with E. coli. The MBC of functionalized mesoporous silica supports was established to be below 0.1 mg/mL against E. coli and S. aureus, which is much lower than that of free thymol (0.3 mg/mL and 0.5 mg/mL against E. coli and S. aureus, respectively). In addition, at a range from 0.05 mg/mL to 0.2 mg/mL, immobilized hollow mesoporous silica nanoparticles (HMSNs) can inhibit the growth of E. coli in apple juice and maintain good sensory properties during 7 days of storage. View Full-Text
Keywords: silica nanoparticles; mesoporous structure; antimicrobial activity; immobilization; thymol silica nanoparticles; mesoporous structure; antimicrobial activity; immobilization; thymol
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MDPI and ACS Style

Liu, Y.; Li, X.; Sheng, J.; Lu, Y.; Sun, H.; Xu, Q.; Zhu, Y.; Song, Y. Preparation and Enhanced Antimicrobial Activity of Thymol Immobilized on Different Silica Nanoparticles with Application in Apple Juice. Coatings 2022, 12, 671. https://doi.org/10.3390/coatings12050671

AMA Style

Liu Y, Li X, Sheng J, Lu Y, Sun H, Xu Q, Zhu Y, Song Y. Preparation and Enhanced Antimicrobial Activity of Thymol Immobilized on Different Silica Nanoparticles with Application in Apple Juice. Coatings. 2022; 12(5):671. https://doi.org/10.3390/coatings12050671

Chicago/Turabian Style

Liu, Yuhao, Xutao Li, Jie Sheng, Yuyang Lu, Huimin Sun, Qixiang Xu, Yongheng Zhu, and Yishan Song. 2022. "Preparation and Enhanced Antimicrobial Activity of Thymol Immobilized on Different Silica Nanoparticles with Application in Apple Juice" Coatings 12, no. 5: 671. https://doi.org/10.3390/coatings12050671

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