Preparation of Long-Term Antibacterial SiO2-Cinnamaldehyde Microcapsule via Sol-Gel Approach as a Functional Additive for PBAT Film

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.

Glufosinate Ammonium-Loaded Halloysite Nanotubes for Slow-Release Weeding Polymer Mulch Films

“…Another important factor could be the heterogeneous nucleation of HNTs, 46 which increased the crystallinity of the PBAT. 47,48 The effect of heterogeneous nucleation of HNTs was also confirmed by the DSC characterization results. The increase in PBAT crystallinity can promote the isolation of water vapor.…”

“…This is because HNTs were well-dispersed in the matrix and the path for water vapor passing through the film was prolonged, which has a barrier effect on water vapor. Another important factor could be the heterogeneous nucleation of HNTs, which increased the crystallinity of the PBAT. , The effect of heterogeneous nucleation of HNTs was also confirmed by the DSC characterization results. The increase in PBAT crystallinity can promote the isolation of water vapor .…”

Recent advances in biobased and biodegradable polymer nanocomposites, nanoparticles, and natural antioxidants for antibacterial and antioxidant food packaging applications

“…These groups of materials have been widely applied in medicine, drug delivery, biosensors, thermal energy storage, and imaging (Pal et al., 2020). In the active packaging materials sector, mesoporous silica NPs (MSN) have attracted extensive attention due to their ability to carry antimicrobial agents, thus increasing the antibacterial activity of packaging systems (Psochia et al., 2021; Wu et al., 2019; Xu et al., 2020). In the study of Mohamed (2020), the nanometric surface coating of MSN with Ag layers increased the surface area of contact with the bacterial membrane and significantly inhibited the growth of S. aureus and E. coli .…”

Comparative Study on Properties of PBAT/PBSA Film Modified by a Multi-Functional Epoxide Chain Extender or Benzoyl Peroxide

“…The second category consists of blends of PBAT with degradable polyesters, such as poly(lactic acid) (PLA), poly(butylene succinate) PBS, and poly(propylene carbonate) PPC [3][4][5]. The third approach blends PBAT with inorganic fillers such as adding silane coupling agents, and compatibilizers [6,7]. The final category of modification methods is based on blending PBAT with biomass-based materials such as lignin, starch and natural fiber reinforcements [8,9].…”