Physicochemical and Structural Properties of Starch from Cassava Roots Differing in Growing Duration and Ploidy Level,Starch

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Physicochemical and Structural Properties of Starch from Cassava Roots Differing in Growing Duration and Ploidy Level
Starch ( IF 2.6 ) Pub Date : 2020-05-12 , DOI: 10.1002/star.201900237
Subrahmanyan S. Gourilekshmi ₁ , Alummoottil N. Jyothi ₁ , Janardanan Sreekumar ₂

Affiliation

Wide variability exists in starch properties even among the same botanical source depending on climatic factors, genotypic differences, harvesting period, etc. The present study is an attempt to understand changes in structure, composition and physicochemical properties of cassava starch with root development. Starch is isolated from five cultivars of cassava at different root harvesting periods starting from root initiation stage, that is, 2–12 months after planting. The cultivars are selected in such a way that they represent different growing duration (short and normal), ploidy level (diploid and triploid), and end use (industrial and edible). Amylose/amylopectin ratio varies in a narrow range (0.24–0.28) for the starch from different varieties. Starch granule morphology does not show any significant variation with root growth and cultivar, but the average granule size varies significantly. All the starches show A‐type X‐ray diffraction pattern and the percentage crystallinity ranges from 37% to 48%. Average chain length and molecular weight of the starch show varietal differences. Even though the swelling power, solubility, water binding capacity and paste clarity are not significantly affected by the root harvesting period, the cultivar differences are evident for these parameters. Significant differences in the physicochemical and functional properties of starch with ploidy of the plant are not observed.

中文翻译：

木薯根淀粉生长时间和倍性水平不同的理化特性

即使在相同的植物来源中，淀粉的特性也存在很大的差异，这取决于气候因素，基因型差异，收获期等。本研究旨在了解木薯淀粉随着根的发育在结构，组成和理化特性上的变化。从根部萌芽期（即种植后2至12个月）开始，在不同的根部收获时期从五个木薯品种中分离出淀粉。选择的品种应代表不同的生长持续时间（短期和正常），倍性水平（二倍体和三倍体）和最终用途（工业和可食用）。来自不同品种的淀粉的直链淀粉/支链淀粉比例在狭窄的范围内（0.24-0.28）变化。淀粉颗粒形态没有显示根生长和品种的任何显着变化，但平均颗粒大小差异很大。所有淀粉均显示出A型X射线衍射图，且结晶度百分比范围为37％至48％。淀粉的平均链长和分子量显示出品种差异。即使溶胀力，溶解度，水结合能力和糊的透明度不受根部收获期的显着影响，但这些参数的品种差异却很明显。没有观察到淀粉的物理化学和功能特性与植物的倍性有显着差异。根部收获期对溶解度，水结合能力和糊的透明度没有显着影响，这些参数的品种差异显而易见。没有观察到淀粉的物理化学和功能特性与植物的倍性有显着差异。根部收获期对溶解度，水结合能力和糊的透明度没有显着影响，这些参数的品种差异显而易见。没有观察到淀粉的物理化学和功能特性与植物的倍性有显着差异。

更新日期：2020-05-12

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