Novel graphene oxide modified LDH@CEO antibacterial materials capable of NIR stimuli-responsive control release for food preservation

The development of antimicrobial packaging materials serves as an effective means to enhance food preservation and mitigate food waste. This study had developed a near-infrared (NIR)-controlled smart responsive system for the release of antibacterial cinnamon essential oils (CEO), which involves immobilizing CEO within the interlayer of layered double hydroxides (LDHs) and decorating it with graphene oxide (GO), designated as LDH@CEO-GO. LDH@CEO-GO was prepared by co-precipitation method. The release kinetics of CEO at various temperatures was investigated, revealing that the release dynamics conform to the Fickian diffusion mechanism. Under NIR light serves as an intelligent switch that can regulate temperature, thereby facilitating the release of CEO. Antibacterial tests demonstrated that LDH@CEO-GO exhibited good antibacterial properties, achieving inhibition rates of 77.5 % and 68.3 % against E. coli and S. aureus, respectively. NIR irradiation, the inhibition rates increased to 98.3 % and 97.2 %. Through practical exploration of strawberry preservation, it was found that under NIR light stimulation, LDH@CEO-GO can effectively enhance the preservation of strawberries.