Abstract Sweet potato starch has great edible and economic value and has been widely studied. Starches from different varieties have significantly different properties. Previous studies are focused on white, yellow and orange sweet potato. In this study, starches were isolated from purple sweet potato variety Ningzi 1 and six advanced breeding lines with different genotypes, their structural and functional properties were investigated and compared. Seven starches all had round, polygonal, oval and semi-oval shapes with central hila, but showed different granule sizes. The starch content in dry root tubers varied from 40.1 to 55.1%. The apparent amylose content ranged from 24.6 to 31.0%. The seven sweet potatoes all had CA-type starch. The swelling power and water solubility at 95 °C ranged from 22.5 to 29.0 g/g and 13.1 to 16.9%, respectively. The starches displayed a two peak gelatinization thermogram, the first peak temperature ranged from 64.1 to 69.0 °C and the second peak temperature ranged from 73.5 to 80.8 °C. The peak viscosity, hot viscosity, breakdown viscosity and setback viscosity varied from 2535 to 3750 mPa s, 1517 to 2450 mPa s, 1018 to 1622 mPa s, and 474 to 1036 mPa s, respectively. The seven starches had different hydrolysis degrees to porcine pancreatic α-amylase and Aspergillus niger amyloglucosidase. All the starches had high resistance to the in vitro digestion. This study could provide important information for the utilization of purple advanced breeding lines in breeding and food and nonfood industries.

中文翻译：

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七种紫甘薯淀粉的表征及比较研究

摘要 红薯淀粉具有很高的食用价值和经济价值，得到了广泛的研究。不同品种的淀粉具有显着不同的特性。以前的研究集中在白色、黄色和橙色甘薯上。本研究从紫甘薯品种宁子1号和6个不同基因型的先进育种系中分离出淀粉，对其结构和功能特性进行了研究和比较。七种淀粉均呈圆形、多角形、椭圆形和半椭圆形，中央肺门，但颗粒大小不同。干块茎中的淀粉含量从 40.1% 到 55.1% 不等。表观直链淀粉含量范围为 24.6 至 31.0%。七个红薯都含有CA型淀粉。95°C 下的溶胀力和水溶性分别为 22.5 至 29.0 g/g 和 13.1 至 16.9%。淀粉显示出双峰糊化热谱图，第一个峰温度范围为 64.1 至 69.0 °C，第二个峰温度范围为 73.5 至 80.8 °C。峰值粘度、热粘度、破裂粘度和回退粘度分别在 2535 至 3750 mPa s、1517 至 2450 mPa s、1018 至 1622 mPa s 和 474 至 1036 mPa s 之间变化。7种淀粉对猪胰α-淀粉酶和黑曲霉淀粉葡萄糖苷酶的水解程度不同。所有淀粉均具有较高的体外消化抗性。该研究可为紫色先进育种系在育种、食品和非食品行业的利用提供重要信息。5 至 80.8°C。峰值粘度、热粘度、破裂粘度和回退粘度分别在 2535 至 3750 mPa s、1517 至 2450 mPa s、1018 至 1622 mPa s 和 474 至 1036 mPa s 之间变化。7种淀粉对猪胰α-淀粉酶和黑曲霉淀粉葡萄糖苷酶的水解程度不同。所有淀粉均对体外消化具有较高的抗性。该研究可为紫色先进育种系在育种、食品和非食品行业的利用提供重要信息。5 至 80.8°C。峰值粘度、热粘度、破裂粘度和回退粘度分别在 2535 至 3750 mPa s、1517 至 2450 mPa s、1018 至 1622 mPa s 和 474 至 1036 mPa s 之间变化。7种淀粉对猪胰α-淀粉酶和黑曲霉淀粉葡萄糖苷酶的水解程度不同。所有淀粉均对体外消化具有较高的抗性。该研究可为紫色先进育种系在育种、食品和非食品行业的利用提供重要信息。所有淀粉均对体外消化具有较高的抗性。该研究可为紫色先进育种系在育种、食品和非食品行业的利用提供重要信息。所有淀粉均对体外消化具有较高的抗性。该研究可为紫色先进育种系在育种、食品和非食品行业的利用提供重要信息。