Li Fuli, Zhang Fan, Chen Ruixian, Ma Zexiang, Wu Hejun, Zhang Zhiqing, Yin Shutao, Zhou Man
College of Food Science, Sichuan Agricultural University, No. 46, Xin Kang Road, Ya'an 625014, China.
Institute of Modern Agricultural Industry, China Agricultural University, Chengdu 611430, China.
Foods. 2023 Dec 20;13(1):22. doi: 10.3390/foods13010022.
This study determined that leaves (ZBLs) are rich in functional components such as cellulose, protein, flavone, and polyphenols. Therefore, they were used as the main raw material, with sodium alginate as a thickener and glycerol as a plasticizer, to investigate the preparation of active films from ZBL powder through high-pressure homogenization (HPH). The physical, optical, mechanical, and antioxidant properties of the films were evaluated, and their application in preserving fresh-cut apples was examined. The results showed that the optimal concentration of ZBL powder was 1.5% under a 30 MPa HPH treatment. The resulting HPH-treated films exhibited a denser microstructure and improved water vapor barrier properties and mechanical strength. Compared to the films without HPH treatment, the tensile strength increased from 4.61 MPa to 12.13 MPa, the elongation at break increased from 21.25% to 42.86%, the water vapor permeability decreased from 9.9 × 10 g/m·s·Pa to 8.0 × 10 g/m·s·Pa, and the transparency increased from 25.36% to 38.5%. Compared to the control group, the fresh-cut apples packaged with the HPH-treated ZBL active films exhibited effective preservation of apple quality during a five-day period at 4 °C and 70% humidity, showing better preservation effects than the other groups. In conclusion, the use of HPH treatment in developing novel biopolymer active films from ZBL powders with enhanced properties holds potential for various applications.
本研究确定竹叶（ZBLs）富含纤维素、蛋白质、黄酮和多酚等功能成分。因此，以竹叶粉为主要原料，海藻酸钠为增稠剂，甘油为增塑剂，通过高压均质（HPH）研究竹叶粉活性膜的制备。对薄膜的物理、光学、机械和抗氧化性能进行了评估，并考察了其在鲜切苹果保鲜中的应用。结果表明，在30MPa的高压均质处理下，竹叶粉的最佳浓度为1.5%。经高压均质处理后的薄膜具有更致密的微观结构，其水蒸气阻隔性能和机械强度得到改善。与未经高压均质处理的薄膜相比，拉伸强度从4.61MPa提高到12.13MPa，断裂伸长率从21.25%提高到42.86%，水蒸气透过率从9.9×10 g/m·s·Pa降低到8.0×10 g/m·s·Pa，透明度从25.36%提高到38.5%。与对照组相比，用经高压均质处理的竹叶活性膜包装的鲜切苹果在4℃、70%湿度条件下保存5天期间，苹果品质得到有效保持，保鲜效果优于其他组。总之，利用高压均质处理从竹叶粉开发具有增强性能的新型生物聚合物活性膜在各种应用中具有潜力。
