【摘要】 采用场流分离技术探究了马铃薯（Solanum tuberosum L.）淀粉分离表征过程中样品间以及样品与超滤膜的交联，评价了载液离子强度、样品进样量、交叉流流速和聚集时间对马铃薯淀粉回收率的影响，并对结果重复性进行了考察.结果表明：在载液（含5 mmol/L NaNO₃,3 mmol/L NaN₃）pH 7.00,样品进样量15μg,交叉流流速1.0 mL/min,聚集时间2.5 min的条件下，马铃薯淀粉的回收率为（97.30±0.02）%,回转半径相对标准偏差为1.18%,分子摩尔质量的相对标准偏差为5.67%.更多还原

【Abstract】 Potato starch was separated and characterized by field-flow fractionation. The interactions between the sample and the surface of ultrafiltration membrane in AF4 were investigated. The effects of ionic strength of carrier liquid, injection mass, cross-flow rate, and focusing time on the sample recovery were evaluated. The repeatability of the results was examined. The highest recovery of potato starch（97.30±0.02）% was obtained with a carrier liquid containing 5 mmol/L NaNO₃ and 3 mmol/L NaN₃, pH 7.00; injection mass, 15 μg; cross-flow rate, 1.0 mL/min; focusing time, 2.5 min. The method developed in this study showed good repeatability in terms of radius of gyration and molar mass with their relative standard deviations of 1.18% and 5.67%, respectively.更多还原