Preparation of Cinnamon Oil‐Loaded Antibacterial Composite Microcapsules by In Situ Polymerization of Pickering Emulsion Templates

Abstract

In this study, the cinnamon oil (CMO)‐loaded antibacterial composite microcapsules with silicon dioxide (SiO2)/poly(melamine formaldehyde) (PMF) hybrid shells are effectively and facilely constructed by in situ polymerization of SiO2 nanoparticle–stabilized Pickering emulsion templates. The morphological structure, composition, and thermal performance of the microcapsules are determined by scanning electronic microscopy, Fourier transform infrared spectroscopy, and thermal gravimetric analysis. In addition, in vitro CMO release and antimicrobial investigations of the microcapsules are also performed, respectively. The results demonstrate that the microcapsules own an approximately spherical shape with a core–shell structure. Moreover, the micro‐encapsulation of CMO clearly increases its thermal stability, and meanwhile results in obtaining microcapsules with the controlled CMO release and visibly long‐term antimicrobial effects. All the results show that in situ polymerization based on templating Pickering emulsions is an attractive method to construct antibacterial essential oil–loaded microcapsules, which can be served as promising antibacterial materials.

Cinnamon Cassia Oil Emulsions Stabilized by Chitin Nanofibrils: Physicochemical Properties and Antibacterial Activities

“…via expression, fermentation, enfleurage, and most commonly used steam distillation . As the leading roles in aromatherapy, EOs have been reported to possess promising antimicrobial, antioxidant, anxiolytic, and pesticidal activities. , As a representative for EOs, Cinnamon cassia oil ( C. cassia oil) has been confirmed to exhibit excellent antimicrobial efficacy against bacteria including Escherichia coli ( E. coli ), Listeria monocytogenes , and Staphylococcus , which has also been proven to be more effective than other EOs like clove bud oil and allspice oil. − Nevertheless, direct incorporation of essential oils into food as preservatives is still rare due to certain limitations such as low water solubility, high volatility, strong odor, negative organoleptic effects, and possible toxicity to human skin cells. − On the other hand, EOs like C. cassia oil are generally sensitive toward environmental factors such as temperature, light, and oxygen, which would decrease the shelf life stability and shorten the functional activity efficiency, posing limitations on their practical application fields. , To overcome such barriers, EOs encapsulation has been intensively studied to improve their solubility, stability, and functional properties while reducing the adverse effects. , …”

“…10−13 On the other hand, EOs like C. cassia oil are generally sensitive toward environmental factors such as temperature, light, and oxygen, which would decrease the shelf life stability and shorten the functional activity efficiency, posing limitations on their practical application fields. 14,15 To overcome such barriers, EOs encapsulation has been intensively studied to improve their solubility, stability, and functional properties while reducing the adverse effects. 16,17 Natural biopolymers such as chitosan, gelatin, alginate, etc., have attracted great interest in the encapsulation of EOs due to their good biocompatibility and nontoxicity with the advantages in avoidance of food-additive labeling, reduced flavor impact, and controlled diffusion of EOs.…”

Pickering Emulsions Stabilized by Halloysite Nanotubes: From General Aspects to Technological Applications

“…employed in situ polymerization of SiO 2 to prepare Pickering emulsions with cinnamon oil as inner core, thus possessing excellent and long‐term antibacterial properties, as showed by in vivo experiments. [ 46 ]…”

Chitosan microcapsules: Methods of the production and use in the textile finishing

“…111 In the same way, there are a lot of EOs studied as core of microcapsule, recently. Some other examples: thyme EOs used to antibacterial function in viscose fiber 112 ; cinnamon oil microencapsulated can be served as antibacterial materials 113 ; Aloe vera microcapsules applied in cotton nonwovens 27 ; gallic acid applied to make cosmeto-textile 114 ; Palmarosa (Cymbopogon martinii) oil microcapsules was used as antimicrobial and aroma finishing of organic cotton knits 115 ; citronella (Cymbopogon winterianus) oil microcapsules reduced volatility and irritation for cosmetic textile uses. 111…”