Dialdehyde starch was prepared by one-step synthesis of acid hydrolysis and oxidation, using corn starch as the raw material, sodium periodate (NaIO4) as the oxidant, and hydrochloric acid (HCl) as the acid solution. The prepared dialdehyde starch was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and gel permeation chromatography (GPC). The results confirmed that oxidation occurred between the starch and NaIO4. The acid hydrolysis reaction reduced the molecular weight of starch and effectively improved the aldehyde group contents (92.7%). Scanning electron microscope (SEM) analysis indicated that the average particle size decreased after acid hydrolysis and oxidation reaction. X-ray diffraction (XRD) and thermal gravimetric analyzer (TGA) analysis demonstrated that the crystallinity of the obtained dialdehyde starch showed a downward trend and a decelerated thermal decomposition rate. The starch after acid hydrolysis and oxidation exhibited lower hot paste viscosity and higher reactivity.

中文翻译：

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一步酸水解和氧化法制备和表征二醛淀粉。

以玉米淀粉为原料，高碘酸钠（NaIO4）为氧化剂，盐酸（HCl）为酸溶液，通过酸水解和氧化的一步合成法制备二醛淀粉。制备的二醛淀粉通过傅里叶变换红外光谱（FT-IR），X射线光电子能谱（XPS）和凝胶渗透色谱（GPC）进行表征。结果证实在淀粉和NaIO4之间发生氧化。酸水解反应降低了淀粉的分子量，有效提高了醛基含量（92.7％）。扫描电子显微镜（SEM）分析表明，酸水解和氧化反应后平均粒径减小。X射线衍射（XRD）和热重分析仪（TGA）分析表明，所获得的二醛淀粉的结晶度呈现下降趋势，并且热分解速率降低。酸水解和氧化后的淀粉表现出较低的热糊粘度和较高的反应性。