基底物质对大豆分离蛋白/黄原胶复合膜结构和性能的影响

高杰; 曾馨俞; 薛艺璇; 赵萍; 赵瑛; 刘小春; 汪瑞; 刘冰; 何海宁

doi:10.13386/j.issn1002-0306.2023110158

基底物质对大豆分离蛋白/黄原胶复合膜结构和性能的影响

Effects of Matrices on the Structure and Properties of Composite Films of Soy Protein Isolates/Xanthan Gum

摘要

摘要: 本文研究大豆分离蛋白（SPI）和黄原胶（XG）与不同基底添加物成膜的结构和性能。以SPI和XG为基材，加入海藻酸钠（SA）、羧甲基纤维素（CMC）、明胶（GEL)、果胶（PEC）和琼脂（Agar）制备复合膜，对复合膜厚度、机械性能、透氧性和不透明度进行测定，并对其结构进行表征。结果表明，添加1.5 g不同添加物的复合膜厚度显著增高（P<0.05），拉伸强度最大为SPI/XG-Agar膜5.90±0.32 MPa（P<0.05），透氧性显著降低（P<0.05），不透明度最低为SPI/XG-Agar膜0.45±0.09 Abs₆₀₀/mm（P<0.05）。SEM显示，SPI/XG-Agar复合膜表面平坦光滑且无颗粒，而其他复合膜表面有颗粒和褶皱。红外光谱显示，基材之间均有良好的相容性。SPI/XG-Agar复合膜的拉伸强度、不透明度及SEM结果优于其他复合膜。

Abstract: The structures and properties of the composite films formed by soy protein isolate (SPI) and xanthan gum (XG) with different other matrices were investigated. The composite films were prepared with SPI and XG by adding sodium alginate (SA), carboxymethyl cellulose (CMC), gelatin (GEL), pectin (PEC) and agar (Agar), respectively. The thickness, mechanical properties, oxygen permeability and opacity of the composite films were measured, and their structures were characterized. The results showed that the thicknesses of composite films with 1.5 g of different other matrices were significantly higher (P<0.05) than the film of SPI/XG, and the maximum tensile strength was 5.90±0.32 MPa for SPI/XG-Agar film (P<0.05), the oxygen permeabilities of them were significantly reduced (P<0.05), and the lowest opacity was 0.45±0.09 Abs₆₀₀/mm for SPI/XG-Agar film (P<0.05). The photograph of SEM showed that the surface of SPI/XG-Agar composite film was flat, smooth and free of particles, while the other composite films were with particles and folds on the surface. The infrared spectroscopy analysis showed that there was good compatibility between all the matrices. The results of tensile strength, opacity and SEM for the SPI/XG-Agar film were superior to other films.