Physicochemical characterization of grifolan: Thixotropic properties and complex formation with Congo Red
作者： Ching-Feng Mao , Ming-Ching Hsu , Wei-Hsin Hwang
DOI: 10.1016/J.CARBPOL.2006.11.003
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摘要: Abstract Grifolan is a branched (1,3)-β-glucan extracted from the fungus Grifola frondosa. Its physicochemical properties were investigated by studying visible spectrum of Congo Red–glucan complexes and rheological behavior. The analysis indicated that alkali-extracted grifolan was in triple-helix conformation. structure remained unaltered temperature range studied (5–25 °C) or when varying sucrose content (0–20%), but disappeared at urea concentration 5.0 M. formed gel subambient temperatures. thixotropic viscosity profile gels fitted structural kinetics model, thixotropy attributed to breakdown aggregates triple helices under shear. rate found increase both with increasing shear temperature. amount available for shear-induced shear-rate independent, decreased presence resulted significant changes thixotropy, which enhancing effect on strength loss due breaking intermolecular hydrogen bonds urea.
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