Structural and functional properties of starches from root tubers of white, yellow, and purple sweet potatoes
Structural and functional properties of starches from root tubers of white, yellow, and purple sweet potatoes
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白、黄、紫甘薯块根淀粉的结构和功能特性
DOI：
10.1016/j.foodhyd.2018.11.058
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发表时间：
2019-04-01
影响因子：
10.7
通讯作者：
Wei, Cunxu
中科院分区：
文献类型：
--
作者：
Guo, Ke;Liu, Tianxiang;Wei, Cunxu
甘薯是一种重要的淀粉资源，由于基因型背景不同，块根颜色也不同。但淀粉特性与块根颜色是否相关尚不清楚。本研究以3个白色、3个黄色和3个紫色甘薯品种为材料，在相同的环境条件下进行栽培试验。白色品种块根淀粉含量最高，为61.5 ~ 67.5%，可溶性糖含量最低，为13.1 ~ 18.0%;黄色品种块根淀粉含量最低，为45.8 ~ 53.1%，可溶性糖含量最高，为28.9 ~ 31.5%。不同品种的淀粉颗粒大小（D[4，3] 12.3-18.1 μ m）和直链淀粉含量（24.1-27.2%）不同，但都具有C-A型晶体结构。9个品种的相对结晶度在22.3 ~ 25.5%，1045/1022和1022/995 cm（-1）的吸光度比值分别在0.665 ~ 0.775和0.846 ~ 0.944之间。不同花色品种的淀粉在膨胀力、水溶性、糊化温度、糊化粘度、消化特性等方面存在差异。基于淀粉性状参数的聚类分析表明，甘薯淀粉性状与块根颜色无关，而由品种基因型背景决定。
Sweet potato is an important starch resource and has different colored root tubers due to different genotype backgrounds. However, it is unclear whether starch properties are related to the color of root tuber. In this study, 3 white, 3 yellow, and 3 purple sweet potato varieties were planted in the same environment. The dry root tubers of white varieties had the highest starch ranging from 61.5 to 67.5% and the lowest soluble sugar ranging from 13.1 to 18.0%, and those of yellow varieties had the lowest starch ranging from 45.8 to 53.1% and the highest soluble sugar ranging from 28.9 to 31.5%. Starches from different varieties had different granule sizes (D[4,3] 12.3-18.1 mu m) and amylose contents (24.1-27.2%), but all exhibited C-A-type crystalline structure. The relative crystallinity ranged from 22.3 to 25.5%, and the IR absorbance ratios of 1045/1022 and 1022/995 cm(-1) ranged from 0.665 to 0.775 and from 0.846 to 0.944, respectively, among 9 varieties. The starches from the same or different colored varieties had differences in swelling power, water solubility, gelatinization temperature, pasting viscosity, and digestion properties. The cluster analysis based on starch property parameters indicated that starch properties of sweet potato had no relationship with the color of root tuber but were determined by the genotype background of variety.