Supramolecular assemblies from plant cell polysaccharides: Self-healing and aging behavior

被引:10
作者
Roversi, T. [1 ]
Piazza, L. [1 ]
机构
[1] Univ Milan, Dept Food Environm & Nutr Sci, DeFENS, I-20133 Milan, Italy
关键词
Cell wall; Rheology; Self-healing; Aging; WALL PARTICLE DISPERSIONS; RHEOLOGICAL PROPERTIES; SOFT MATTER; SHEAR-FLOW; SUSPENSIONS; POLYMERS; DYNAMICS; VISCOELASTICITY; DISINTEGRATION; DEFORMATION;
D O I
10.1016/j.foodhyd.2015.10.004
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
A fundamental understanding of plant cell wall rheology is essential in view of the formulation engineering of plant-based foods/ingredients. In this paper, by means of oscillatory measurements, we study the rheological behavior of water suspensions of cell wall polysaccharidic supramolecular assemblies, which are extracted with selective solvents precipitation method from apple flesh. Once rehydrated with water, they behave as gel like materials, as it results from the mechanical spectra, with the elastic modulus G' higher than G '' within the frequency range considered. Interestingly, amplitude and time sweep measurements show reversible stress softening and stress recovery after high shear strain. The observed behavior of the cell wall molecular assemblies resembles closely to that of colloidal gels, which also display shear-thinning rheological properties and a complex aging response. In this regard, creep measurements indicate history-dependent effects, which are interpreted in terms of aging phenomena, similar to those existing in glassy systems. The self-healing behavior and the non-equilibrium nature we observed allow customized modifications during processing and storage to obtain new structural states and rheology. Such changes in the microstructure might be relevant for product and process performance. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码:189 / 195
页数:7
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