摘要
Using cinnamon and Litsea cubeba composite essential oils as natural active substances,Gel and Carboxymeth-ylcellulose Sodium(CMC-Na)as sustained-release carriers,and gel as base materials,the antimicrobial activity of the composite film and its preservation effect on cherry tomatoes were studied.The results showed that the optimal preparation parameters of composite essential oil microcapsule film were 0.75 mL of glycerol,1.00 g of microcapsule,60℃of drying temperature.The antimicrobial film showed excellent comprehensive perfor-mance,with an oxygen permeability of 42.16 cm^(3)/(m^(2)⋅24h⋅0.1 MPa),a moisture permeability of 1181.39 g/(m^(2)⋅day),a transparency of 75.25%,a tensile strength of 35.43 MPa and an elongation at break of 62.20%.The results of scanning electron microscopy and Fourier transform infrared(FTIR)analysis showed that the micro-capsules were uniformly distributed in the film matrix.Thermogravimetric analysis(TGA)confirmed that the film has good thermal stability,thus ensuring its long-term antimicrobial performance in practical applications.The results showed that the weight loss rate of cherry tomatoes after 10 days of storage was only 21.68%,which was significantly lower than that of the blank control group(36.48%).The color brightness and soluble solids content were kept at a high level.The microencapsulation treatment effectively delayed the oxidative degra-dation of phenols and flavonoids,and significantly improved the scavenging ability of tomato fruit extracts against 2,2-Diphenyl-1-picrylhydrazyl(DPPH)and 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid)[ABTS]free radicals.It indicates that the microencapsulated film has better preservation function than Poly-ethylene Film(PE)film.These findings demonstrate that the microencapsulated films with essential oils represent a promising,biocompatible approach for controlling food related pathogens,and they could be used as active packaging materials to replace food packaging plastics for food preservation.
基金
supported by the National Key Research and Development Program Project(2025YFE0111000).
