Abstract New Zealand Maori potatoes (Taewa) represent unique genetic resources for potato quality, though they are much underutilized. In this report, the composition and molecular structure of starches from 5 Maori potato varieties were studied. In particular, the internal unit chain composition of the amylopectins in the form of β-limit dextrins was highlighted. Starches from a commercial modern potato variety and a maize variety with normal amylose contents were employed for comparison. Genetic diversity in the amylose (e.g., 22.6% in Moemoe to 28.6% in Turaekuri) and phosphorus (5.4 mg/100 g in Turaekuri to 7.0 mg/100 g in Kowiniwini) contents as well as the molecule structure of the starches (e.g., external chain length of amylopectin ranged from 13.0 glucosyl residues in Turaekuri to 15.8 glucosyl residues in Karuparera) has been revealed. Maori potato amylopectins have the highest amount of long unit and internal chains and the lowest amount of these chains among amylopectins from different sources. Overall, Maori potato starch appeared to be structurally and compositionally similar to modern potato starch.

中文翻译：

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毛利马铃薯淀粉的分子结构

摘要 新西兰毛利马铃薯（Taewa）代表了马铃薯品质的独特遗传资源，尽管它们未被充分利用。在本报告中，研究了来自 5 个毛利马铃薯品种的淀粉的组成和分子结构。特别地，突出了以β-极限糊精形式存在的支链淀粉的内部单元链组成。使用来自商业现代马铃薯品种和具有正常直链淀粉含量的玉米品种的淀粉进行比较。直链淀粉（例如，Moemoe 中的 22.6% 至 Turaekuri 中的 28.6%）和磷（Turaekuri 中的 5.4 mg/100 g 至 Kowiniwini 中的 7.0 mg/100 g）含量以及淀粉的分子结构（例如，支链淀粉的外链长度范围从 Turaekuri 中的 13.0 个葡糖基残基到 Karuparera 中的 15.8 个葡糖基残基）已被揭示。毛利马铃薯支链淀粉在不同来源的支链淀粉中长单元链和内链的数量最多，而这些链的数量最少。总体而言，毛利马铃薯淀粉在结构和成分上似乎与现代马铃薯淀粉相似。