经真空冷等离子体(VCP)改性的乳清蛋白异构体(WPI)水溶液的吸附层特性和泡沫行为

Elham Ommat Mohammadi, S. Yeganehzad, M. A. Hesarinejad, M. Dabestani, R. von Klitzing, Reinhard Miller, Emanuel Schneck
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引用次数: 0

摘要

多年来,冷等离子体加工作为一种非热处理技术一直被用于食品等行业。由于蛋白质的界面特性在许多工艺中发挥着重要作用,本研究探讨了冷等离子体对 WPI 发泡和界面行为的影响。本研究的目的是评估低压冷等离子体(VCP)处理分离乳清蛋白(WPI)时使用的不同气体(空气、1:1 氩气-空气混合物和六氟化硫(SF6))对 WPI 水溶液的表面和发泡行为的影响。本研究调查了动态表面扩张弹性、表面张力等温线、表层厚度以及发泡性和泡沫稳定性。VCP 处理对吸附层厚度没有明显影响。然而,经 SF6VCP 处理后,诱导时间、表面压力平衡值和聚集尺寸都有所增加,这可能是由于 WPI 与冷等离子体中的活性 SF6 物种发生了反应。经 VCP 处理后,表面扩张弹性模量增大,这可能与蛋白质层通过磺化和聚集体形成提高了机械强度有关。对 WPI 进行 VCP 处理可提高泡沫稳定性,而泡沫气泡的平均直径和泡沫中的液体排出量则取决于冷等离子体所使用的气体。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Adsorption Layer Properties and Foam Behavior of Aqueous Solutions of Whey Protein Isolate (WPI) Modified by Vacuum Cold Plasma (VCP)
For years, cold plasma processing has been used as a non-thermal technology in industries such as food. As interfacial properties of protein play a remarkable role in many processes, this study investigates the effect of cold plasma on the foaming and interfacial behavior of WPI. The objective of this study is to evaluate the effect of different gases (air, 1:1 argon–air mixture, and sulfur hexafluoride (SF6)) used in low-pressure cold plasma (VCP) treatments of whey protein isolate (WPI) on the surface and foaming behavior of aqueous WPI solutions. Dynamic surface dilational elasticity, surface tension isotherms, surface layer thickness, and the foamability and foam stability were investigated in this study. VCP treatment did not significantly affect the adsorption layer thickness. However, an increase in induction time, surface pressure equilibrium value, and aggregated size is observed after SF6VCP treatment, which can be attributed to the reaction of WPI with the reactive SF6 species of the cold plasma. The surface dilational elastic modulus increased after VCP treatment, which can be related to the increased mechanical strength of the protein layer via sulfonation and aggregate formation. VCP treatment of WPI increases the foam stability, while the average diameter of foam bubbles and liquid drainage in the foam depends on the gas used for the cold plasma.
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