School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China; Joint International Research Laboratory of Agriculture and Agri-Product Safety, the Ministry of Education of China, Institutes of Agricultural Science and Technology Development of Yangzhou University, Yangzhou 225009, Jiangsu, China.
Jiangsu Key Laboratory of Crop Genetics and Physiology, Key Laboratory of Plant Functional Genomics of the Ministry of Education, Jiangsu Key Laboratory of Crop Genetics and Physiology, College of Agriculture, Yangzhou University, Yangzhou 225009, China.
Food Chem. 2021 Aug 15;353:129467. doi: 10.1016/j.foodchem.2021.129467. Epub 2021 Mar 7.
Starch lamellar and crystalline structures are important controller of its physicochemical and digestion properties. Here, starch lamellar/crystalline structures of 16 different rice starches were investigated and correlated with their chain-length distributions (CLDs) and molecular size distributions. Results showed that the thickness of amorphous lamellae was mainly correlated with the amount of amylose short and medium chains. Thickness of both amorphous and crystalline lamellae was negatively correlated with the amount of amylopectin medium chains and relative length of amylopectin short chains. The degree of crystallinity was negatively correlated with the amount of amylose short and long chains. The lamellar ordering, fractal nature and thickness polydispersity were also related to the starch CLDs. Whereas, starch molecular size distributions were shown to be lack of correlations with the starch lamellar/crystalline structures. This study helps a better understanding of the molecular nature of starch semi-crystalline lamellae.
淀粉的层状和结晶结构是控制其物理化学和消化特性的重要因素。本研究调查了 16 种不同稻米淀粉的层状/结晶结构，并将其与链长分布（CLD）和分子量分布相关联。结果表明，无定形层片的厚度主要与直链淀粉短链和中链的含量有关。无定形和结晶层片的厚度均与支链淀粉中链的含量和支链淀粉短链的相对长度呈负相关。结晶度与直链淀粉短链和长链的含量呈负相关。层状有序性、分形性质和厚度多分散性也与淀粉 CLD 有关。然而，淀粉的分子量分布与淀粉的层状/结晶结构缺乏相关性。本研究有助于更好地理解淀粉半结晶层片的分子特性。
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