فهرست نشریات علمی دسترسی آزاد ایران

This study presents a novel strategy for fabricating active food packaging by endowing low-density polyethylene (LDPE) films with antimicrobial and antioxidant properties. To achieve this, hybrid materials were synthesized by intercalating ascorbyl palmitate (AP) molecules into the galleries of Cloisite 30B nanoclays via an ultrasonication method. These Cloisite 30B-AP hybrids were subsequently incorporated into an LDPE matrix through melt-mixing to produce LDPE/(Cloisite 30B-AP) nanocomposite films. The structural properties of the synthesized hybrids and the resulting nanocomposite films were thoroughly characterized. Wide-angle X-ray diffraction (WAXD) analysis of the Cloisite 30B-AP hybrids revealed a significant increase in the d-spacing of the nanoclay compared to pristine Cloisite 30B. This expansion confirms the successful intercalation of AP molecules between the silicate layers. Furthermore, the WAXD pattern of the nanocomposite film indicated a high degree of dispersion of the Cloisite 30B-AP hybrids within the LDPE matrix. The optimized nanocomposite films demonstrated potent antimicrobial efficacy against both Gram-positive and Gram-negative bacterial strains. Concurrently, they exhibited substantial antioxidant activity, displaying a 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging capacity of up to 85%. Consequently, this work introduces a new, single active material—the Cloisite 30B-AP hybrid—that is highly effective at imparting dual-functionality, combining both antioxidant and antimicrobial characteristics, to polymeric food packaging materials.