School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China.
State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Changsha 410007, China.
Int J Biol Macromol. 2024 Jan;256(Pt 1):128286. doi: 10.1016/j.ijbiomac.2023.128286. Epub 2023 Nov 23.
This study evaluated the effects of an edible bilayer containing polyphenols from the Euryale ferox seed shell on ready-to-eat cooked beef products, including the physical, mechanical, antioxidant, and antibacterial capabilities. Here, the bilayer films were prepared by layer-by-layer solution pouring using hydrophobic ethyl cellulose (EC) as the outer layer, and hydrophilic gelatin/carboxymethyl chitosan (GC) as the inner layer. By adjusting the proportion of gelatin to carboxymethyl chitosan, the optical, mechanical, and barrier characteristics of bilayer films were markedly enhanced. Extracted polyphenol (EP) from shell of the Euryale ferox seed performed potent antibacterial property against Listeria monocytogenes (L. monocytogenes). The addition of EP to the inner layer of the optimized bilayer film further improved the mechanical and barrier properties of films, and as expected, the film exhibited antioxidant and antibacterial abilities. Additionally, cooked beef and cooked chicken preservation tests indicated that the active bilayer film showed good inhibition of L. monocytogenes and delayed lipid oxidation in ready-to-eat meat products, and significantly delayed the pH, moisture loss, color and texture changes. This study developed multifunctional bilayer active edible films, which has a great potential in the preservation ready-to-eat cooked meat products.
本研究评估了一种含有芡实种皮多酚的可食用双层膜对即食熟牛肉制品的影响，包括物理、机械、抗氧化和抗菌性能。在此，通过层层溶液浇注制备双层膜，疏水性乙基纤维素（EC）作为外层，亲水性明胶/羧甲基壳聚糖（GC）作为内层。通过调整明胶与羧甲基壳聚糖的比例，显著增强了双层膜的光学、机械和阻隔特性。从芡实种皮中提取的多酚（EP）对单核细胞增生李斯特菌（L. monocytogenes）具有很强的抗菌活性。将 EP 添加到优化双层膜的内层进一步提高了薄膜的机械和阻隔性能，并且正如预期的那样，薄膜表现出抗氧化和抗菌能力。此外，对熟牛肉和熟鸡肉的保鲜试验表明，活性双层膜对即食肉类产品中的单核细胞增生李斯特菌具有良好的抑制作用，并延缓了脂质氧化，显著延缓了 pH 值、水分损失、颜色和质地的变化。本研究开发了多功能双层活性可食用膜，在即食熟肉产品的保鲜方面具有很大的潜力。
