Structure characteristics and rheological properties of acidic polysaccharide from boat-fruited sterculia seeds
Wu, Y., Cui, S.W., Wu, J., Ai, L., Wang, Q., Tang, J. (2012). Structure characteristics and rheological properties of acidic polysaccharide from boat-fruited sterculia seeds, 88(3), 926-930. http://dx.doi.org/10.1016/j.carbpol.2012.01.035
An acidic polysaccharide (APS) was extracted from the boat-fruited sterculia seeds (Semen Sterculiae Lychnophorae). It consisted mainly of galacturonic acid (40.1%, w/w) along with rhamnose, arabinose, galactose, xylose and glucose as minor components, indicating a pectic polysaccharide which was confirmed by FT-IR spectra. The degree of esterification of APS determined by FT-IR method was 68%. The shear-thinning and viscoelastic behaviors of APS have been investigated by steady shear and small amplitude oscillatory experiments, respectively. Steady-shear rheological measurement in a range of shear rate (1-1000 s -1) showed increase in pseudoplasticity (or non-Newtonian shear-thinning flow behavior) with the increase in APS concentration (1.0-10%, w/v). APS itself could not form a gel; however, thermal irreversible gels were obtained in the presence of sucrose at low pH (pH < 3.5). The changes in storage modulus G' and loss modulus G'' during heating and cooling cycles indicated that G' was nearly reversible at temperature >30°C while G'' exhibited thermal hysteresis. © 2012 Elsevier Ltd. All rights reserved.
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