Starch nanocrystals (SNCs) were prepared from waxy rice starch via sulfuric acid hydrolysis. The objective focused on the following: i) the hydrolysis kinetics and structural properties of SNCs; ii) the effects of differential centrifugation on the yield and size distribution of SNCs. The hydrolysis was divided into a rapid hydrolysis stage in the initial two days and a slow hydrolysis stage after two days. During the two-day hydrolysis, the average diameter of SNCs reached 244 nm. After two days of hydrolysis, the degree of crystallinity, crystallite size, and melting temperature and enthalpy increased. The proportion of A-branched chains decreased, whereas the proportion of B1-branched chains and molecular weight did not change considerably. Thus, the reaction in the slow hydrolysis stage could be considered as the surface modification and gradual release of SNCs. Furthermore, SNCs with a small size and high charge density could be used for differential centrifugation.

通过硫酸水解糯米淀粉制备淀粉纳米晶体 (SNC)。目标集中在以下方面：i）SNC 的水解动力学和结构特性；ii) 差速离心对 SNC 产量和大小分布的影响。水解分为前两天的快速水解阶段和两天后的缓慢水解阶段。在为期两天的水解过程中，SNC 的平均直径达到了 244 nm。水解两天后，结晶度、微晶尺寸、熔化温度和热函增加。A支链的比例下降，而B1支链的比例和分子量没有显着变化。因此，缓慢水解阶段的反应可以认为是SNCs的表面修饰和逐渐释放。此外，具有小尺寸和高电荷密度的 SNC 可用于差速离心。