窄分子量分布甘薯直链淀粉和支链淀粉的回生,International Journal of Food Science & Technology

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窄分子量分布甘薯直链淀粉和支链淀粉的回生
International Journal of Food Science & Technology ( IF 2.6 ) Pub Date : 2021-07-15 , DOI: 10.1111/ijfs.15271
Danli Wang ₁ , Zhixiang He ₂ , Lu Yang ₂ , Huaiwen Wang ₃ , Lian Xijun ₂ , Wei Zhu ₁

Affiliation

采用X射线衍射(XRD)研究了分子量分布窄的甘薯直链淀粉和支链淀粉在不同温度下的回生过程。结合原子力显微镜（AFM）、扫描电子显微镜（SEM）和光学显微镜，研究了回生过程中分子组装体的形态。Avrami方程通过确定结晶度和两个不同峰的峰面积比用于上述淀粉的回生动力学。发现只有 2 θ处的峰面积/总面积之比 = ~16.3°可以代表回生的含淀粉无定形区域的结晶度。以结晶度为回生率，Avrami方程只能分析甘薯直链淀粉的回生动力学，支链淀粉不能。在任何温度下，直链淀粉的所有 Avrami 指数n均小于 1.0，表明瞬时成核和棒状生长。原子力显微镜结果表明，甘薯直链淀粉、支链淀粉及其混合物的层状结构的最大高度分别约为 4800、180 和 200 nm。前两者的高度在储存过程中降低，但混合高度保持不变。在淀粉回生过程中，直链淀粉充当支链淀粉的核。

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Retrogradation of sweet potato amylose and amylopectin with narrow molecular weight distribution

Retrogradation of sweet potato amylose and amylopectin with narrow molecular weight distribution at different temperatures was investigated by X-ray diffraction (XRD). Atomic force microscope (AFM), scanning electron microscope (SEM) and light microscopy were combined to study the morphology of the molecular assemblies during retrogradation. Avrami equation was used to the retrogradation kinetics the of above starches by determining the crystallinity and the ratio of peak area of two distinctive peaks. It was found that only the ratio of peak area/total area at 2θ = ~16.3° could represent the crystallinity of retrograded starch-containing amorphous regions. Considering the crystallinity as retrogradation rate, only the retrogradation kinetics of sweet potato amylose could be analysed by Avrami equation, but not the amylopectin’s. All Avrami exponents n of amyloses at any temperatures were less than 1.0, indicating instantaneous nucleation and rod-like growth. AFM results showed that the maximum heights of layered structure for sweet potato amylose, amylopectin and blending of both were approximately 4800, 180 and 200 nm, respectively. The height of the former two decreased during storage, but the height of blending remained unchanged. Amylose served as nuclei of amylopectin during starch retrogradation.

更新日期：2021-07-15

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