State Key Laboratory of Food Science and Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi 214122, Jiangsu Province, China; School of Food Science and Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi 214122, Jiangsu Province, China.
School of Chemical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand.
Food Chem. 2018 Mar 1;242:106-112. doi: 10.1016/j.foodchem.2017.09.024. Epub 2017 Sep 7.
Unit chain length distributions of amylopectin and its φ, β-limit dextrins, which reflect amylopectin internal structure from three maca starches, were determined by high-performance anion-exchange chromatography with pulsed amperometric detection after debranching, and the samples were compared with maize starch. The amylopectins exhibited average chain lengths ranging from 16.72 to 17.16, with ranges of total internal chain length, external chain length, and internal chain length of the maca amylopectins at 12.49 to 13.68, 11.24 to 11.89, and 4.27 to 4.48. The average chain length, external chain length, internal chain length, and total internal chain length were comparable in three maca amylopectins. Amylopectins of the three maca genotypes studied here presented no significant differences in their unit chain length profiles, but did show significant differences in their internal chain profiles. Additional genetic variations between different maca genotypes need to be studied to provide unit- and internal chain profiles of maca amylopectin.
用高效阴离子交换色谱-脉冲安培检测法对 3 种玛咖淀粉的支链淀粉及其 φ、β-极限糊精的单元链长分布进行了测定，对样品进行了与玉米淀粉的比较。直链淀粉的平均链长范围为 16.72 至 17.16，玛咖直链淀粉的总内部链长、外部链长和内部链长的范围分别为 12.49 至 13.68、11.24 至 11.89 和 4.27 至 4.48。三种玛咖直链淀粉的平均链长、外部链长、内部链长和总内部链长相当。研究的三种玛咖基因型的直链淀粉在单元链长分布上没有显著差异，但在内部链分布上有显著差异。需要进一步研究不同玛咖基因型之间的遗传变异，以提供玛咖直链淀粉的单元和内部链长分布。
