School of Chemical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand.
School of Chemical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand.
Carbohydr Polym. 2017 Feb 20;158:124-132. doi: 10.1016/j.carbpol.2016.12.001. Epub 2016 Dec 2.
Quinoa starch has very small granules with unique properties. However, the molecular structure of quinoa starch remains largely unknown. In this study, composition and amylopectin molecular structure of 9 quinoa starch samples were characterised by chromatographic techniques. In particular, the amylopectin internal molecular structure, represented by φ, β-limit dextrins (LDs), was explored. Great variations in the composition and molecular structures were recorded among samples. Compared with other amylopectins, quinoa amylopectin showed a high ratio of short chain to long chains (mean:14.6) and a high percentage of fingerprint A-chains (A) (mean:10.4%). The average chain length, external chain length, and internal chain length of quinoa amylopectin were 16.6, 10.6, and 5.00 glucosyl residues, respectively. Pearson correlation and principal component analysis revealed some inherent correlations among structural parameters and a similarity of different samples. Overall, quinoa amylopectins are structurally similar to that from starches with A-type polymorph such as oat and amaranth starches.
藜麦淀粉颗粒非常小，具有独特的性质。然而，藜麦淀粉的分子结构在很大程度上仍不清楚。在这项研究中，通过色谱技术对 9 种藜麦淀粉样品的组成和支链淀粉分子结构进行了表征。特别是，研究了支链淀粉内部分子结构，用φ、β-极限糊精（LDs）表示。样品之间的组成和分子结构存在很大差异。与其他支链淀粉相比，藜麦支链淀粉具有短链与长链比例高（平均值：14.6）和指纹 A 链（A）比例高（平均值：10.4%）的特点。藜麦支链淀粉的平均链长、外部链长和内部链长分别为 16.6、10.6 和 5.00 个葡萄糖残基。皮尔逊相关和主成分分析显示，结构参数之间存在一些内在相关性，不同样品之间存在相似性。总的来说，藜麦支链淀粉的结构与 A 型多晶型淀粉（如燕麦和苋属淀粉）的支链淀粉相似。
