湿热处理对绿豆淀粉结构及理化特性的影响
Effect of heat moisture treatment on the structural and physicochemical properties of mung bean starch
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摘要: 采用湿热处理对绿豆淀粉进行改性,研究湿热处理过程中不同水分含量(15%、20%、25%和30%)对绿豆淀粉结构(结晶结构和短程有序化结构)和理化特性(热力学特性、糊化特性和消化特性)的影响。结果表明:湿热处理未改变绿豆淀粉的结晶类型,但其相对结晶度和短程有序化程度降低;随着湿热处理过程中体系水分含量的增加,绿豆淀粉的糊化温度、峰值温度和终止温度均增加,而峰值黏度、终值黏度和回生值均降低,即绿豆淀粉的热稳定性增强;与湿热处理前的绿豆淀粉相比,湿热处理能明显增加绿豆淀粉中的抗性淀粉含量。Abstract: Mung bean starch was modified by heat moisture treatment (HMT). The effects of HMT on the structural properties (crystalline and short-range ordered molecular structure) and physicochemical properties (thermodynamics, pasting and digestion properties) of samples with different moisture contents (15%, 20%, 25% and 30%) were studied. The results showed that the crystal type of mung bean starch was not changed by HMT, but the crystallinity and short-range ordered molecular structures decreased. With the increase of moisture content, the gelatinization, peak and termination temperature of mung bean starch increased, while the peak viscosity, final viscosity and setback decreased. These results showed that the thermal stability of starch was enhanced after HMT. Compared with the original mung bean starch, the content of resistant starch was significantly increased by HMT.
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Key words:
- mung bean starch /
- heat moisture treatment /
- structural property /
- pasting property /
- digestion property
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