1. Mechanisms of slow-release antibacterial properties in chitosan‑titanium dioxide stabilized perilla essential oil Pickering emulsions: Focusing on oil-water interfacial behaviors.
- Author
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Wang H, Waterhouse GIN, Xiang H, Sun-Waterhouse D, Zhao Y, Chen S, Wu Y, and Wang Y
- Subjects
- Oils, Volatile chemistry, Oils, Volatile pharmacology, Particle Size, Delayed-Action Preparations chemistry, Plant Oils chemistry, Plant Oils pharmacology, Microbial Sensitivity Tests, Drug Liberation, Chitosan chemistry, Chitosan pharmacology, Emulsions, Titanium chemistry, Anti-Bacterial Agents chemistry, Anti-Bacterial Agents pharmacology, Staphylococcus aureus drug effects, Escherichia coli drug effects, Water chemistry
- Abstract
Perilla essential oil (PLEO) offers benefits for food preservation and healthcare, yet its instability restricts its applications. In this study, chitosan (CS) and TiO
2 used to prepare composite particles. TiO2 , after being modified with sodium laurate (SL), was successfully introduced at 0.1 %-3 % into the CS matrix. The resulting CS-SL-TiO2 composite particles can be formed by intertwining and rearranging through intramolecular and intermolecular interactions, and form an O/W interface with stability and viscoelasticity. The Pickering emulsions stabilized by these particles exhibit non-Newtonian pseudoplastic behavior, shear-thinning properties, and slow-release characteristics, along with antibacterial activity. Emulsions with 0.5 % and 1 % CS-SL-TiO2 composites demonstrated superior antibacterial effects against Escherichia coli and Staphylococcus aureus. The study revealed that all emulsions undergo Fickian diffusion and a sustained release of PLEO, with the Ritger-Peppas model best describing this release mechanism. The slow-release behaviors positively correlates with interfacial pressure, composite particle size, composite particle potential, composite contact angle, emulsion particle size and emulsion potential, but negatively correlates with diffusion rate, penetration rate, release kinetics and release rate. The findings lay groundwork for developing slow-release antimicrobial emulsions within polysaccharide matrices, showcasing promise for antimicrobial packaging solutions and enhanced food preservation techniques., Competing Interests: Declaration of competing interest The authors declare that they have no conflicts of interest., (Copyright © 2024 Elsevier Ltd. All rights reserved.)- Published
- 2024
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