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Li, Zhi-Xuan; Deng, Hui-Qiong; Jiang, Jie; He, Zi-Qing; Li, Dong-Mei; Ye, Xi-Guang; Chen, Yun; Hu, Yong; Huang, Chao
International journal of biological macromolecules, 06/2024, Letnik: 270, Številka: Pt 2Journal Article
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 (CaCl2) 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. Display omitted •Effect of hydrothermal treatment on xanthan gum rheological properties was learned.•Hydrothermal treatment with different temperatures was carried out.•Flow curves, dynamic viscoelasticity, and complex viscosity were studied.•Different factors affecting xanthan gum rheological properties were evaluated.•The alteration of rheological properties was related to the change of structure.
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