Zhu Yu, Ying Liwei, Du Xianfeng, Guo Li, Zhu Guilan, Lu Hongxia
Department of Biological and Food Engineering, Hefei Normal University, Lian Hua Road, Hefei 230601, China.
Anhui Engineering Laboratory of Agro-products Processing, Anhui Agricultural University, Hefei 230036, China.
Food Chem X. 2025 May 29;28:102597. doi: 10.1016/j.fochx.2025.102597. eCollection 2025 May.
The industrial applicability of high-amylose maize starch (HAS) is limited by incomplete gelatinization during conventional hydrothermal treatment, necessitating the use of more efficient plasticizers. In this study, the phase transitions of HAS in ethylene glycol were investigated using differential scanning calorimetry (DSC), confocal laser scanning microscopy (CLSM), and molecular dynamics (MD) simulations. DSC revealed higher transition temperatures ( = 223.2 °C, = 226.5 °C, = 233.5 °C) than water-based systems, whereas disappearing birefringence in the CLSM images confirmed the loss of crystallinity. MD simulations and Fourier-transform infrared spectroscopy (FTIR) demonstrated intramolecular hydrogen bonding disruption, and hence weakened starch-starch interactions. Optimal phase transition conditions (10 % HAS, 7 days storage, 30 min reaction, 400 W ultrasonic power, 234 °C) were established for high-temperature film casting or injection molding. Ethylene glycol acted as both a plasticizer and hydrogen bond competitor. These findings motivate high-performance biodegradable HAS-based materials and applications research.
高直链玉米淀粉（HAS）的工业适用性受到传统水热处理过程中糊化不完全的限制，因此需要使用更有效的增塑剂。在本研究中，利用差示扫描量热法（DSC）、共聚焦激光扫描显微镜（CLSM）和分子动力学（MD）模拟研究了HAS在乙二醇中的相变。DSC显示，与水基体系相比，其转变温度更高（起始温度=223.2℃，峰值温度=226.5℃，终了温度=233.5℃），而CLSM图像中双折射的消失证实了结晶度的丧失。MD模拟和傅里叶变换红外光谱（FTIR）表明分子内氢键被破坏，从而削弱了淀粉-淀粉相互作用。确定了用于高温流延薄膜或注塑成型的最佳相变条件（10% HAS、7天储存、30分钟反应、400W超声功率、234℃）。乙二醇既是增塑剂又是氢键竞争者。这些发现推动了基于HAS的高性能生物可降解材料及其应用的研究。
