Samani Maedeh Asad, Babaei Sedigheh, Naseri Mahmood, Majdinasab Marjan, Nafchi Abdorreza Mohammadi
Department of Natural Resources and Environmental Engineering, School of Agriculture Shiraz University Shiraz Iran.
Department of Food Science and Technology, School of Agriculture Shiraz University Shiraz Iran.
Food Sci Nutr. 2023 Apr 17;11(7):3767-3779. doi: 10.1002/fsn3.3361. eCollection 2023 Jul.
This research aims to produce an antioxidant and biodegradable polysaccharide film by using macroalgae agar and sulfated polysaccharide. Agar and sulfated polysaccharide (fucoidan) were extracted from and macroalgae. Five treatments were conducted: (A) agar film (1%, W:V), (C) chitosan film (1%, W:V + 1% acetic acid), (AC) agar:chitosan composite (50:50, V:V), (ACF) AC film with fucoidan (0.5%, W:V), and (ACFA) ACF film with citric acid (30% of the dry weight of film) as a cross-linking agent. Then, 0.75% (V:V) of glycerol was added to all films. The physical, mechanical, antioxidant, color variations, microstructure (SEM), and Fourier transform infrared (FT-IR) spectroscopy were investigated. Based on the results, modifying the agar film with chitosan improved the mechanical strength, humidity, and solubility in the AC composite film ( < .05). Further, adding sulfated polysaccharide and citric acid cross-linking agent to the agar-chitosan composite led to a significant decrease in solubility, humidity, and permeability to water vapor in ACFA films ( < .05), indicating strong cross-linking and reduction in film pores based on the SEM pictures and FTIR results. However, the physical and mechanical properties of the agar-based film obtained from Gracilaria algae can be improved by adding chitosan and citric acid cross-linking agent, and the addition of fucoidan obtained from Sargassum algae has improved its antioxidant properties. This biodegradable film can be a good candidate for preserving perishable products.
本研究旨在利用大型海藻琼脂和硫酸化多糖制备一种具有抗氧化性且可生物降解的多糖薄膜。琼脂和硫酸化多糖（岩藻聚糖）分别从[具体藻类1]和[具体藻类2]大型海藻中提取。进行了五种处理：（A）琼脂薄膜（1%，重量/体积），（C）壳聚糖薄膜（1%，重量/体积 + 1%乙酸），（AC）琼脂：壳聚糖复合材料（50:50，体积/体积），（ACF）含岩藻聚糖的AC薄膜（0.5%，重量/体积），以及（ACFA）以柠檬酸（占薄膜干重的30%）作为交联剂的ACF薄膜。然后，向所有薄膜中添加0.75%（体积/体积）的甘油。对其物理性能、机械性能、抗氧化性能、颜色变化、微观结构（扫描电子显微镜）和傅里叶变换红外光谱进行了研究。结果表明，用壳聚糖对琼脂薄膜进行改性可提高AC复合薄膜的机械强度、湿度和溶解性（P < 0.05）。此外，向琼脂 - 壳聚糖复合材料中添加硫酸化多糖和柠檬酸交联剂会导致ACFA薄膜的溶解性、湿度和水蒸气透过率显著降低（P < 0.05），基于扫描电子显微镜图片和傅里叶变换红外光谱结果表明交联作用增强且薄膜孔隙减少。然而，通过添加壳聚糖和柠檬酸交联剂可改善从江蓠属藻类获得的琼脂基薄膜的物理和机械性能，添加从马尾藻属藻类获得的岩藻聚糖则提高了其抗氧化性能。这种可生物降解薄膜可能是保存易腐产品的良好候选材料。
