在这项研究中,大豆分离蛋白(SPI)膜结合槲皮素接枝二醛淀粉(DAS-QR)和DAS/QR,分别,是开发的。结构,物理,并对复合膜的功能性能进行了测定。结果表明,DAS-QR和DAS/QR与SPI基质形成氢键,提高了薄膜的结构性能。遮光能力,热稳定性,疏水性,抗拉强度,断裂伸长率,DAS-QR和DAS/QR提高了SPI膜的抗氧化和抗菌能力。值得注意的是,掺入DAS-QR的SPI膜在抗氧化剂方面表现出比DAS/QR更好的性能(SPI/DAS-QR:DPPH的79.8%和ABTS的62.1%清除活性;SPI/DAS/QR:DPPH的71.4%和ABTS的56.0%清除活性)和对金黄色葡萄球菌的抗菌能力(SPI/DAS-QR的抑制率:92.7%,SPI/DAS/QR为83.4%)。SPI/DAS-QR复合涂膜有效地保持了外观质量,延迟重量和总可溶性固体的损失,丙二醛积累延迟,并降低了鲜切马铃薯中的过氧化物酶活性和微生物污染。这些良好的性能突出了SPI/DAS-QR作为一种有前途的活性包装材料的鲜切产品保存。
In this study, soy protein isolate (SPI) films incorporating quercetin-grafted dialdehyde starch (DAS-QR) and DAS/QR, respectively, were developed. The structural, physical, and functional properties of the composite films were determined. The results suggested that DAS-QR and DAS/QR formed hydrogen bonding with the SPI matrix, which improved the structural properties of the films. The light-blocking capacity, thermal stability, hydrophobicity, tensile strength, elongation at break, and antioxidant and antibacterial abilities of SPI films were improved by DAS-QR and DAS/QR. Notably, SPI films incorporated with DAS-QR exhibited better performance than those with DAS/QR in terms of antioxidant (SPI/DAS-QR: 79.8% of DPPH and 62.1% of ABTS scavenging activity; SPI/DAS/QR: 71.4% of DPPH and 56.0% of ABTS scavenging activity) and antibacterial abilities against S. aureus (inhibition rate: 92.7% for SPI/DAS-QR, 83.4% for SPI/DAS/QR). The composite coating film SPI/DAS-QR effectively maintained appearance quality, delayed the loss of weight and total soluble solids, postponed malondialdehyde accumulation, and decreased peroxidase activity and microbial contamination in fresh-cut potatoes. These good performances highlight SPI/DAS-QR as a promising active packaging material for fresh-cut product preservation.