Abstract
The mesoporous silica wall materials can achieve controlled load and sustained-release of active agents. An antimicrobial nanoscale silica microcapsule containing cinnamaldehyde (CA) was prepared by the sol-gel method and applied in poly (butyleneadipate-co-terephthalate) (PBAT) film. The surface morphology, physical and chemical properties, and antibacterial properties of microcapsules and films were studied. The effects of different temperatures and humidities on the release behavior of microcapsules were also evaluated. Results showed that CA was successfully encapsulated in silica microcapsule which had a diameter of 450–700 nm. The antibacterial CA agent had a long-lasting release time under lower temperature and relative humidity (RH) environment. At low temperature (4 °C), the microcapsules released CA 32.35% in the first 18 h, and then slowly released to 56.08% in 216 h; however, the microcapsules released more than 70% in 18 h at 40 °C. At low humidity (50%RH), the release rates of microcapsules at the 18th h and 9th d were 43.04% and 78.01%, respectively, while it reached to equilibrium state at 72 h under 90% RH. The sustained release process of CA in SiO2-CA microcapsules follows a first-order kinetic model. Physicochemical properties of PBAT films loaded with different amounts of microcapsules were also characterized. Results showed that the tensile strength and water vapor transmission rate (WVTR) of the composite film containing 2.5% microcapsules were increased by 26.98% and 14.61%, respectively, compared to the raw film, while the light transmittance was slightly reduced. The crystallinity of the film was improved and can be kept stable up to 384.1 °C. Furthermore, microcapsules and composite film both exhibited distinctive antibacterial effect on Escherichia coli and Listeria monocytogenes. Therefore, SiO2-CA microcapsules and composite films could be a promising material for the active packaging.
Highlights
Antibacterial packaging is the last line of defense to ensure food safety, representing an active packaging system containing antibacterial substances which can be incorporated into the substrate material either physical or chemical approach [1,2,3]
Results showed that the tensile strength and water vapor transmission rate (WVTR) of the composite film containing 2.5% microcapsules were increased by 26.98% and 14.61%, respectively, compared to the raw film, while the light transmittance was slightly reduced
We developed a system for preparing sustained-release antimicrobial microcapsules and their application on PBAT films
Summary
Antibacterial packaging is the last line of defense to ensure food safety, representing an active packaging system containing antibacterial substances which can be incorporated into the substrate material either physical or chemical approach [1,2,3]. Processes 2020, 8, 897 its insecticidal, anti-inflammatory, and anti-tumor effects, which makes it a candidate for active packaging to achieve high-efficiency bacteriostasis even when not in direct contact with microbes [6,7] It has been approved by the FDA as a food additive, which can inhibit more than 20 common bacteria that could cause human infectious diseases and food breakdown [8]. (butyleneadipate-co-terephthalate) (PBAT) has emerged as a promising alternative to food packaging materials It is a novel bio-compostable aliphatic-aromatic polyester obtained from fossil resources by polycondensation and transesterification of poly (butylene adipate) and poly (butylene terephtalate) that combines the advantages of both aliphatic and aromatic polyesters. The mesoporous silica wall material was prepared by sol-gel method and used to encapsulate unstable CA to obtain nanoscale antimicrobial microcapsules, and the effect of CA concentration on the encapsulation efficiency was studied. Microcapsules with different contents were further loaded on the PBAT film to confer antibacterial properties, and the physical and chemical modification effects of the microcapsules on the film were studied
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