College of Engineering, China Agricultural University, PO Box 50, 17 Qinghua Donglu, Beijing 100083, China.
Carbohydr Polym. 2013 Sep 12;97(2):512-7. doi: 10.1016/j.carbpol.2013.04.089. Epub 2013 May 7.
The objective of this work was to investigate the effect of partial gelatinization of starch on its retrogradation using differential scanning calorimetry (DSC) and X-ray diffraction (XRD) techniques. The Avrami equation was used to predict the evolution of starch retrogradation kinetics. The degree of retrogradation in starch samples partially gelatinized 64°C (S64), 68°C (S68) and 70°C (S70) and control (S25) increased with storage time. The retrogradation enthalpies of S68 and S70 were almost four times as high as that of S64. The S25 and S64 had dominant A-type crystalline pattern while S68 and S70 showed dominant B-type crystalline pattern. The growth of remainder crystals was faster in S25 and S64, while both the nucleation and growth rates of new crystals were faster in S68 and S70. The Avrami model was found to represent the retrogradation kinetics data of these partially gelatinized starch samples quite satisfactorily (R(2)>0.95).
本工作旨在通过差示扫描量热法（DSC）和 X 射线衍射（XRD）技术研究淀粉部分糊化对其回生的影响。采用 Avrami 方程预测淀粉回生动力学的演变。在 64°C（S64）、68°C（S68）和 70°C（S70）部分糊化以及对照（S25）淀粉样品中，随着储存时间的增加，回生程度增加。S68 和 S70 的回生焓几乎是 S64 的四倍。S25 和 S64 具有主要的 A 型晶体形态，而 S68 和 S70 则显示出主要的 B 型晶体形态。S25 和 S64 中剩余晶体的生长速度较快，而 S68 和 S70 中新晶体的成核和生长速度都较快。Avrami 模型发现能够很好地代表这些部分糊化淀粉样品的回生动力学数据（R²>0.95）。
