肉桂精油纳米乳-羧甲基壳聚糖复合膜的制备及其在杏鲍菇保鲜中的应用OA

To extend the shelf life of postharvest Pleurotus eryngii,this study developed a no-vel composite film using carboxymethyl chitosan incorporated with a lentinan-stabilized cin-namon essential oil nanoemulsion(CMCS/LNT-CEONE).The optimal preparation parame-ters were determined through single-factor experiments and response surface methodology,with the mechanical properties of the composite film as the key indicator.The structural characteristics of the film were analyzed using scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR),and FT-IR diffraction(XRD).The results showed that the optimal preparation conditions were as follows:CMCS addition amount of 2.8 g,glycerol concentration of 36％,ultrasonic time of 30 min,ultrasonic power of 80％,and vol-ume ratio of CMCS solution to LNT-CEONE of 7∶3.SEM observations revealed a uniform internal structure and good compatibility among the components.FTIR spectroscopy analysis revealed characteristic absorption peaks at 1 621 cm-1 and 3 344 cm-1.XRD patterns indica-ted a reduction in diffraction peak intensity for the CMCS/LNT-CEONE film compared to pure CMCS film,suggesting a decrease in crystallinity.Antibacterial assays demonstrated that the CMCS/LNT-CEONE composite film exhibited significant antimicrobial activity.Preservation experiments confirmed that the CMCS/LNT-CEONE film effectively maintained the appearance,minimized weight loss,and delayed discoloration of Pleurotus eryngii.In con-clusion,the CMCS/LNT-CEONE composite film provides a theoretical basis and practical reference for preserving edible fungi and offers a foundation for developing novel postharvest preservation technologies.