Abstract The present study investigated the differences in starch and amylose content among six chestnut cultivars widely distributed in China, as well as the relationship between their physicochemical characteristics and in vitro digestibility. The cultivar and geographical distribution significantly influenced the characteristics of chestnut starch. The starch granule from all six cultivars was round or irregular polygonal in shape, with a particle size that varied from 1 to 20 μm. The amylose content ranged from 22.27 to 29.80% of starch, while the damaged starch was 3.44–11.94%. The volume average particle size of the chestnut starches from the six cultivars varied from 8.33 to 10.24 μm, and the median diameter ranged from 6.82 to 8.69 μm. The short-range order of the six chestnut starches exhibited no significant difference, but their X-ray patterns were different and their relative crystallinity ranged between 19.3 and 27.9%. The resistant starch accounts for 70.1–85.6% of chestnut starch, and was found to be positively correlated with the amylose content. The glycemic index was negatively correlated with the relative crystallinity, indicating that the crystalline structure of starch had a retardant effect on its digestibility.

中文翻译：

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板栗淀粉理化特性与体外消化率的关系

摘要 本研究调查了我国广泛分布的6个板栗品种淀粉和直链淀粉含量的差异，及其理化特性与体外消化率的关系。品种和地域分布对板栗淀粉的特性有显着影响。六个品种的淀粉颗粒均呈圆形或不规则多边形，粒径在1~20 μm不等。直链淀粉含量为淀粉的 22.27 至 29.80%，而受损淀粉为 3.44-11.94%。六个品种板栗淀粉的体积平均粒径为8.33~10.24 μm，中值粒径为6.82~8.69 μm。六种栗子淀粉的短程顺序没有显着差异，但它们的 X 射线图谱不同，它们的相对结晶度在 19.3% 和 27.9% 之间。抗性淀粉占板栗淀粉的 70.1-85.6%，与直链淀粉含量呈正相关。升糖指数与相对结晶度呈负相关，表明淀粉的结晶结构对其消化率有延缓作用。