School of Food Science, Guangdong Pharmaceutical University, Zhongshan 528458, People's Republic of China; Key Laboratory of Quantitative Synthetic Biology, Shenzhen Institute of Synthetic Biology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, People's Republic of China.
School of Food Science, Guangdong Pharmaceutical University, Zhongshan 528458, People's Republic of China.
Int J Biol Macromol. 2024 Jun;270(Pt 2):132229. doi: 10.1016/j.ijbiomac.2024.132229. Epub 2024 May 9.
In this study, the effect of hydrothermal treatment with different temperatures (120-180 °C) on the rheological properties of xanthan gum was evaluated. When the temperature of hydrothermal treatment was relatively low (120 °C), the rheological properties of the hydrothermally treated xanthan gum was similar to the untreated xanthan gum (pseudoplastic and solid-like/gel-like behavior). However, as the temperature of hydrothermal treatment was higher, the rheological properties of the hydrothermally treated xanthan gum changed greatly (e.g., a wider range of Newtonian plateaus in flow curves, existence of a critical frequency between the storage modulus (G') and the loss modulus (G") in the dynamic viscoelasticity measurement, variation of complex viscosity). Although the hydrothermal treatment showed little influence on the functional groups of xanthan gum, it altered the micromorphology of xanthan gum from uneven and rough lump-like to thinner and smoother flake-like. In addition, higher concentration (2 %) of hydrothermally treated xanthan gum made its viscosity close to that of the untreated xanthan gum (1 %). Besides, hydrothermal treatment also affected the effect of temperature and salt (CaCl) adding on the rheological properties of xanthan gum. Overall, this study can provide some useful information on the rheological properties of xanthan gum after hydrothermal treatment.
在这项研究中，评估了不同温度（120-180°C）的水热处理对黄原胶流变性的影响。当水热处理温度较低（120°C）时，水热处理黄原胶的流变性与未经处理的黄原胶相似（假塑性和固态/凝胶状行为）。然而，随着水热处理温度的升高，水热处理黄原胶的流变性发生了很大变化（例如，流动曲线中的牛顿平台范围变宽，在动态粘弹性测量中储能模量（G'）和损耗模量（G"）之间存在临界频率，复合粘度的变化）。虽然水热处理对黄原胶的官能团几乎没有影响，但它改变了黄原胶的微观形貌，使黄原胶从不均匀和粗糙的块状变成更薄和更光滑的片状。此外，更高浓度（2%）的水热处理黄原胶使其粘度接近未经处理的黄原胶（1%）。此外，水热处理还影响了温度和盐（CaCl）添加对黄原胶流变性的影响。总的来说，这项研究可以为水热处理后黄原胶的流变性提供一些有用的信息。
