Department of Food Science and Technology, University of California-Davis, Davis, CA 95616, USA.
Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.
Int J Biol Macromol. 2024 Jun;269(Pt 2):132092. doi: 10.1016/j.ijbiomac.2024.132092. Epub 2024 May 7.
This study investigated the potential effect of blending corn starch and pea protein isolate in various ratios (100:0, 70:30, 50:50, 30:70, and 0:100) on the aging properties of biodegradable films. Unlike previous research, the focus was on the often-overlooked aspect of film aging. Fourier-transform infrared spectroscopy and X-ray diffraction demonstrated the physical blending of corn starch and pea protein, along with chemical bonding and conformational changes. The optical and microstructural properties showed the formation of smooth, homogeneous films with good compatibility between the polymers. The water resistance, barrier, and mechanical properties corresponding to the intrinsic nature of protein polymers showed a minimized fluctuations in film properties as film ages, with a reduction of at least twice when protein is added. Remarkably, the blend with a ratio of 30:70 demonstrated the most stable properties during aging. These results demonstrated that blending the pea protein isolate was favorable for delaying the retrogradation and recrystallization of corn starch films. Understanding how these blends influence the aging characteristics of films is not only a novel contribution to the scientific community but also holds practical significance, potentially opening a potential for applications in various industries.
本研究探讨了在不同比例（100:0、70:30、50:50、30:70 和 0:100）下混合玉米淀粉和豌豆分离蛋白对可生物降解薄膜老化性能的潜在影响。与以往的研究不同，本研究的重点是经常被忽视的薄膜老化方面。傅里叶变换红外光谱和 X 射线衍射表明，玉米淀粉和豌豆分离蛋白实现了物理混合，同时发生了化学结合和构象变化。光学和微观结构性能表明形成了光滑、均匀的薄膜，聚合物之间具有良好的相容性。水阻、阻隔和机械性能与蛋白质聚合物的固有性质相对应，在薄膜老化过程中表现出最小的波动，添加蛋白质时波动减少至少两倍。值得注意的是，当蛋白质添加量为 30:70 时，混合物在老化过程中表现出最稳定的性能。这些结果表明，混合豌豆分离蛋白有利于延缓玉米淀粉薄膜的回生和重结晶。了解这些混合物如何影响薄膜的老化特性不仅是对科学界的一个新贡献，而且具有实际意义，可能为各个行业的应用开辟新的可能性。
