为改善燕麦蛋白(oat protein isolate,OPI)酸诱导凝胶性质进而扩大其应用,研究了不同含量的海藻酸钠(sodium alginate,SA,0、0.5、1.5 g/L)和葡萄糖酸内酯(glucono-delta-lactone, GDL,5%、10%、20%,质量分数, 基于蛋白质干重)对燕麦蛋白酸诱导凝胶特性的影响。结果表明,随着SA浓度的增加,凝胶中疏水相互作用和氢键显著增强,促进凝胶从颗粒聚集状或片状聚集转变成均匀多孔的凝胶网络。当GDL含量由5%增加到10%时,凝胶中的静电斥力减弱,疏水相互作用增强,促使OPI-SA凝胶从明显的相分离结构转变成均匀的三维网络结构,当GDL含量增加至20%时,由于静电吸引形成更紧密耦合的凝胶网络,而均匀多孔的三维网络结构有助于凝胶强度的提高,因此,SA含量为1 g/L,GDL含量为10%时,凝胶的硬度最高,可达226.25 g。总体而言,SA和GDL可以来调节酸诱导OPI凝胶的微观结构和凝胶特性,扩大燕麦蛋白的应用范围。
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