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中国精品科技期刊2020
张素敏,崔艳,陈振家,等. 压热改性对黄米淀粉多尺度结构及理化性质的影响[J]. 食品工业科技,2024,45(18):80−87. doi: 10.13386/j.issn1002-0306.2023100234.
引用本文: 张素敏,崔艳,陈振家,等. 压热改性对黄米淀粉多尺度结构及理化性质的影响[J]. 食品工业科技,2024,45(18):80−87. doi: 10.13386/j.issn1002-0306.2023100234.
ZHANG Sumin, CUI Yan, CHEN Zhenjia, et al. Effects of Autoclaving Treatment Modifications on Multi-scale Structure and Physicochemical Properties of Yellow Rice Starch[J]. Science and Technology of Food Industry, 2024, 45(18): 80−87. (in Chinese with English abstract). doi: 10.13386/j.issn1002-0306.2023100234.
Citation: ZHANG Sumin, CUI Yan, CHEN Zhenjia, et al. Effects of Autoclaving Treatment Modifications on Multi-scale Structure and Physicochemical Properties of Yellow Rice Starch[J]. Science and Technology of Food Industry, 2024, 45(18): 80−87. (in Chinese with English abstract). doi: 10.13386/j.issn1002-0306.2023100234.

压热改性对黄米淀粉多尺度结构及理化性质的影响

Effects of Autoclaving Treatment Modifications on Multi-scale Structure and Physicochemical Properties of Yellow Rice Starch

  • 摘要: 为研究压热改性对黄米淀粉多尺度结构和理化性质的影响,本实验借助高效阴离子交换色谱、X射线衍射以及红外光谱、扫描电镜、差示热量扫描仪、快速粘度仪等分析了黄米淀粉改性前后的多尺度结构(形态结构、晶体结构、分子链结构)及糊化特性。结果表明,经过压热改性后黄米淀粉的总淀粉含量没有差异性变化,而直链淀粉含量由7.46%上升到8.28%;与原淀粉相比,改性后黄米淀粉短链比例升高,而中长链和长链比例显著(P<0.05)下降;淀粉的重均摩尔质量、回转半径多分散指数均显著(P<0.05)上升;而Mn值却显著(P<0.05)下降;压热改性后,黄米淀粉微观结构发生较大改变,由原黄米淀粉的颗粒状变为片状,表面粗糙,存在孔状凹陷;红外和X-射线衍射结果表明,压热后的黄米淀粉与原淀粉相比无新官能团产生,但是晶体结构遭到破坏,黄米淀粉的晶体结构由A型变为非晶体构型。压热改性后黄米淀粉的热稳定性、抗剪切性和冷糊稳定性相较于原黄米淀粉更好,不易回生、老化,且压热后黄米淀粉的孔隙度更小,玻璃化转变温度范围更窄。说明压热改性对黄米淀粉的多尺度结构和糊化特性有很显著的影响,这为黄米的进一步精深加工提供了理论依据。

     

    Abstract: To investigate the effect of autoclaving treatment modifications on the multi-scale structure and physicochemical properties of yellow rice starch, a comparative analysis of the multi-scale structure (morphology structure, crystal structure, and molecular chain structure) and gelatinization characteristics were conducted on the pre- and post-modified starch using high-performance anion exchange chromatography, X-ray diffraction, infrared spectroscopy, scanning electron microscopy, differential scanning calorimetry, and rapid viscosity analyzer. The results showed that autoclaving treatment modifications did not significantly alter the total starch content of yellow rice starch. However, the content of amylose increased from 7.46% to 8.28%. In comparison to the original starch, the modified yellow rice starch exhibited an increase in the proportion of short chains, while the proportions of medium and long chains significantly (P<0.05) decreased. The weight-average molecular mass, radius of gyration, and polydispersity index of starch significantly (P<0.05) increased, while the Mn value significantly (P<0.05) decreased. The microstructure of yellow rice starch underwent significant changes from its original granular form to a flaky form with a rough surface and pore-shaped depressions after autoclaving treatment modifications. The results of infrared and X-ray diffraction patterns indicated that new functional groups were not generated in the autoclaved yellow rice starch compared to the original starch. However, the crystal structure of yellow rice starch was destroyed with a transition from the A-type to an amorphous configuration. In comparison to the original yellow rice starch, the autoclaved yellow rice starch exhibited enhanced heat stability, shear resistance, and cold paste stability, and it was less prone to retrogradation and aging. After autoclaving treatment modifications, the porosity of yellow rice starch decreased, and the glass transition temperature range narrowed. The autoclaving treatment modification has a significant impact on the multi-scale structure and gelatinization characteristics of yellow rice starch, providing a theoretical basis for further deep processing of yellow rice.

     

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