Department of Environmental Microbiology and Biotechnology, Faculty of Biological Sciences, Nicolaus Copernicus University, Torun, Poland.
Department of Experimental Medicine, University of Campania Luigi Vanvitelli, 80138 Naples, Italy.
Int J Biol Macromol. 2023 Dec 31;253(Pt 8):127633. doi: 10.1016/j.ijbiomac.2023.127633. Epub 2023 Oct 23.
The objective of this study was to determine the properties of a new active packaging film developed by the addition of mulberry leaves polysaccharides (MLP) into carboxymethyl cellulose (CMC). Biodegradable CMC-MLP films were fabricated by casting method with various concentrations of MLP (1, 5 and 10 % w/w). The addition of MLP into the CMC matrix resulted increased thickness (0.126 to 0.163 mm) and roughness of the films. Also, the decline in moisture content from 27.91 to 14.12 %, water vapor permeability from 8.95 to 5.21 × 10 g s Pa, and a swelling degree from 59.11 to 37.45 % were observed. With the increasing concentration of MLP, the mechanical properties of the films were improved and higher dispersion of UV light were noted. Fourier transform - infrared spectroscopy (FT-IR) and X-ray diffraction revealed good inter-molecular interaction between CMC matrix and MLP. The prepared films showed excellent thermal stability, antioxidant and antibacterial properties as well as susceptibility to biodegradation in the soil environment. Moreover, it was proved that the films have ability to retard oil oxidation. Overall, it was concluded that CMC-MLP films constitute a promising biomaterial that may be applied as active food packaging.
本研究旨在确定通过向羧甲基纤维素（CMC）中添加桑树叶多糖（MLP）而开发的新型活性包装膜的性能。通过浇铸法用不同浓度的 MLP（1、5 和 10%w/w）制备可生物降解的 CMC-MLP 膜。MLP 加入到 CMC 基质中会导致膜的厚度（0.126 至 0.163mm）和粗糙度增加。此外，观察到水分含量从 27.91%下降至 14.12%、水蒸气透过率从 8.95×10-10g s Pa 下降至 5.21×10-10g s Pa、溶胀度从 59.11%下降至 37.45%。随着 MLP 浓度的增加，膜的力学性能得到提高，并且对紫外光的分散性更高。傅里叶变换-红外光谱（FT-IR）和 X 射线衍射表明 CMC 基质和 MLP 之间存在良好的分子间相互作用。所制备的薄膜表现出优异的热稳定性、抗氧化和抗菌性能，以及在土壤环境中易于生物降解的特性。此外，已证明该薄膜具有延缓油氧化的能力。总的来说，CMC-MLP 薄膜构成了一种有前途的生物材料，可作为活性食品包装材料。
