Journal
INDUSTRIAL CROPS AND PRODUCTS
Volume 187, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.indcrop.2022.115515
Keywords
Antioxidant; Antibacterial; Lignin-ZnO nanoparticles; GMA; Food packaging
Categories
Funding
- National Natural Science Foundation of China [51903106, 51873082, 52073123]
- Distinguished Young Natural Science Foundation of Jiangsu Province [BK20200027]
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The lignin-zinc oxide hybrid particles were successfully synthesized using a hydrothermal method, and their addition to PBAT resulted in improved mechanical properties. The PBAT/LZn composite films exhibited UV shielding, antioxidant, and antibacterial activities, making them suitable for active food packaging.
In present works, the lignin-zinc oxide (LZn) hybrid particles composed with lignin nanoparticles (LNP) and zinc oxide (ZnO) were prepared by a simple hydrothermal method under different pH conditions. Results from infrared spectra, thermogravimetric analysis, and elemental analysis evidenced the successful synthesis of LZn hybrids. The bacterial survival rate of LZn-9 (pH=9) against E. coli and S. aureus decreased to 9% and 49%, while the value of LNP was 69% and 80%, respectively. Then glyceryl methacrylate (GMA) was grafted on poly (butyleneadipate-co-terephthalate) (PBAT), following by the addition of LZn hybrid to prepare the master batches. Finally, the master batches were catalyzed by trimethylamine, and the PBAT-G-xLZn composite films were produced. The tensile modulus and yield strength of PBAT-G-3LZn increased by 35.2% and 28.6% compare with pure PBAT, respectively. The PBAT/LZn composite films were found to have obvious UV shielding, antioxidant and antibacterial activities. Composites belong to the contact type antibacterial, the bacterial adhesion rates of PBAT-G-xLZn were obviously reduced compare with pure PBAT. The transmittance at lambda = 320 nm of PBAT-G-3LZn film was only 0.16%, and the radical scavenging activity (RSA) value was 11.6%. The Zn2+ migration concentration of PBAT-G-3LZn was only 3.3 mu g/L. Therefore, the PBAT/LZn composite films were believed to be applied for active food packaging.
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