Crystal structure changes of native and retrograded starches modified by high hydrostatic pressure: Physical dual modification

结晶度 微晶 正交晶系 静水压力 淀粉 化学 晶体结构 结晶学 Crystal(编程语言) 粘度 化学工程 材料科学 热力学 复合材料 食品科学 工程类 物理 程序设计语言 计算机科学
作者
Jaime E. Dominguez-Ayala,M. T. Ayala-Ayala,Gonzalo Velázquez,D.G. Espinosa-Arbeláez,Guadalupe Méndez‐Montealvo
出处
期刊:Food Hydrocolloids [Elsevier BV]
卷期号:140: 108630-108630 被引量:4
标识
DOI:10.1016/j.foodhyd.2023.108630
摘要

The effect of high hydrostatic pressure (HHP) on the structural changes of starches with different state of organization was investigated. Starch in native state (granular - NS) and in retrograded state (granular structure not present - RetS) were adjusted to 40% (w/v) of moisture and then treated at pressures of 300 and 600 MPa for 5 min at 10 °C. The structural changes of NS and RetS were significantly and differently affected by the HHP treatment. When the pressure increased, orthorhombic unit cell of NS showed an increase in crystal parameter of c-axis and a decrease of a- and b-axes. Crystallinity, crystallite size, short-range ordered structure (DO), organization of the double helix structures (DD), and enthalpy change (ΔH) gradually decreased. After treatment at 300 MPa, the granules get aggregated while keeping their granular structure, promoting a higher viscosity. At 600 MPa, leached material, aggregated granules, destroyed, and with collapsed “ellipsoid-shape” structure were observed, which contributes to decreasing the viscosity. In RetS, the dual physical modification achieved after pressurizing the hydrothermally treated starch, resulted in a significant increase in the crystal parameters (a, b, and c) of hexagonal unit cell. Furthermore, the crystallinity, crystallite size, DD, DO, ΔH, and viscosity were improved, while a gradual decrease of the amounts of cavities was observed. Crystal structure changes in RetS showed that the double helices of unit cell were stabilized by dual modification, while the unit cell was affected after pressurization of NS. This investigation is the first evidence of the application of HHP on RetS.
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