Department of Bioprocesses and Materials Engineering, School of Chemical Engineering, University of Campinas, 13083-852 Albert Einstein St. N. 500, Campinas, São Paulo, Brazil.
Packaging Technology Center, Food Technology Institute, 13070-178 Brasil av. n. 2880, Campinas, São Paulo, Brazil.
Int J Biol Macromol. 2021 Dec 15;193(Pt A):425-432. doi: 10.1016/j.ijbiomac.2021.10.156. Epub 2021 Oct 26.
Antioxidant and antimicrobial activities are important characteristics of active film packaging designed to extend food preservation. In this study, functional bio-based films were produced using different concentrations of antioxidant poly(β-pinene) bio-oligomer synthesized via organocatalyzed atom transfer radical polymerization (O-ATRP) and blended with chitosan of different molecular weights. The structural, mechanical, thermal, solubility, antioxidant, and antimicrobial properties of the films were investigated. The poly(β-pinene)-chitosan blends presented significant pores and irregularities with the increase of poly(β-pinene) concentration over 30%. Chitosan molecular weight did not show any important influence in the physical properties of the blends. Poly(β-pinene) load decreased the materials' tensile strength and melting temperature, exhibiting a plasticizing effect on chitosan chains. The antioxidant and antimicrobial activities of the films were improved by poly(β-pinene) incorporation and mainly depended on its concentration. Therefore, the incorporation of poly(β-pinene) in chitosan films can be an alternative for active packaging production.
抗氧化和抗菌活性是设计用于延长食品保质期的活性薄膜包装的重要特性。在这项研究中，使用通过有机催化原子转移自由基聚合（O-ATRP）合成的不同浓度的抗氧化聚（β-蒎烯）生物低聚物，并与不同分子量的壳聚糖混合，制备了功能性生物基薄膜。研究了薄膜的结构、力学、热学、溶解度、抗氧化和抗菌性能。随着聚（β-蒎烯）浓度超过 30%，聚（β-蒎烯）-壳聚糖共混物呈现出明显的孔隙和不规则性。壳聚糖分子量对共混物的物理性能没有明显影响。聚（β-蒎烯）的加入降低了材料的拉伸强度和熔融温度，对壳聚糖链表现出增塑作用。薄膜的抗氧化和抗菌活性通过聚（β-蒎烯）的加入得到提高，这主要取决于其浓度。因此，聚（β-蒎烯）在壳聚糖薄膜中的加入可以作为活性包装生产的一种替代方法。
