通过湿热处理(HMT)对天然莲花(NelumbonuciferaG.)种子淀粉(LSS)进行了单修饰和双修饰,超声(美国),HMT其次是美国(HMT-US),美国紧随其后的是HMT(US-HMT)。对改性莲子淀粉(LSS)的理化性质进行了评价,粘贴,热,流变特性和体外消化率。所有处理均降低了膨胀力(10.52-14.0g/g),溶解度(12.20-15.95%),和直链淀粉含量(23.71-25.67%),除了超声处理(17.67g/g,17.90%,29.09%,分别)与天然LSS(15.05g/g,16.12%,27.12%,分别)。HMT和US处理的淀粉的单修饰和双修饰序列在其衍射图和FTIR光谱中未显示出显着变化。根据流变学研究,对于所有LSS凝胶样品,G'(1665-4004Pa)大于G”(119-308Pa),证明其弹性特性。此外,与天然LSS(15.38J/g)相比,所有处理的糊化焓(17.56-16.05J/g)均增加。超声处理提高了LSS的热稳定性。消化率结果表明,使用HMT和US的双重修饰显着增强了LSS中的抗性淀粉(RS)并减少了缓慢消化的淀粉(SDS)。在改性LSS颗粒的表面上观察到裂纹。除超声处理外,所有改性淀粉的峰值粘度均降低,表明它们在烹饪过程中对剪切稀化的抵抗力,使它们成为理想的断奶食品成分。在这项研究中进行不同修饰后获得的结果可能是选择适当的修饰处理以根据其最终用途生产具有所需性能的修饰LSS的有用参考。
Native lotus (Nelumbo nucifera G.) seed starch (LSS) was single- and dual-modified by heat-moisture treatment (HMT),
ultrasonication (US), HMT followed by the US (HMT-US), and the US followed by HMT (US-HMT). The modified lotus seed starch (LSS) was evaluated for its physicochemical, pasting, thermal, and rheological properties and in vitro digestibility. All treatments decreased the swelling power (10.52-14.0 g/g), solubility (12.20-15.95 %), and amylose content (23.71-25.67 %) except for
ultrasonication (17.67 g/g, 17.90 %, 29.09 %, respectively) when compared with native LSS (15.05 g/g, 16.12 %, 27.12 %, respectively). According to the rheological study, G\' (1665-4004 Pa) was greater than G″ (119-308 Pa) for all LSS gel samples demonstrating their elastic character. Moreover, gelatinization enthalpy (17.56-16.05 J/g) increased in all treatments compared to native LSS (15.38 J/g).
Ultrasonication treatment improved the thermal stability of LSS. The digestibility results showed that dual modification using HMT and US significantly enhanced resistant starch (RS) and reduced slowly digestible starch (SDS) in LSS. Cracks were observed on the surface of the modified LSS granules. Peak viscosity decreased in all modified starches except for
ultrasonication, suggesting their resistance to shear-thinning during cooking, making them ideal weaning food components. The results obtained after different modifications in this study could be a useful ready reference to select appropriate modification treatments to produce modified LSS with desired properties depending on their end-use.