期刊
FOOD CHEMISTRY
卷 280, 期 -, 页码 130-138出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2018.12.059
关键词
Curdlan; Quaternary ammonium salt of curdlan; Chain conformation; Microstructure; Rheological behavior; Viscosity
资金
- National Natural Science Foundation of China [31671812]
- Key Research & Development Program (Modern Agriculture) of Jiangsu Province [BE2017362]
- Jiangsu Overseas Research & Training Program for University Prominent Young & Middle-aged Teachers and Presidents
This study investigated the chain conformation, microstructure, and rheological properties of a quaternary ammonium salt of curdlan (Qcurd) in aqueous medium. Results showed that Qcurd exhibited typical polyelectrolyte behavior in pure water, and the normal viscosity character was observed in 0.1 M NaCl aqueous solution. The weight-average molecular weight (M-w), z-average radius of gyration (R-d), hydrodynamic radius (R-h), conformational parameter (alpha), characteristic constant (alpha) and structure parameter (rho) for Qcurd were determined as 8.08 x 10(4) g/mol, 26.7 nm, 15.0 nm, 0.54, 0.62, and 1.78, respectively, indicating that Qcurd existed as a flexible chain conformation in 0.1 M NaCl solution, verified by atomic force microscopy. Qcurd exhibited more pronounced shear-thinning behavior at higher concentrations. The flow behavior of Qcurd at different concentrations and temperature was well evaluated by power-law model and Arrhenius equation. Dynamic tests revealed that Qcurd showed oscillatory behaviors between a dilute solution and a weak elastic gel.
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