Abstract
Soybean soluble polysaccharide (SSPS) extracted from soybean cotyledons is an acidic polysaccharide containing a protein fraction. Small angle X-ray scattering (SAXS) and static light scattering (SLS) were used to reveal the structural conformation and nano-structural arrangement of SSPS in aqueous solutions aiming to gain more information on the functional properties of SSPS. Three samples, differentiated by their extraction processes, namely SSPS-L; -M; and -H, were used. NMR results show that SSPS has a similar structure regardless of the differences in the extraction conditions. The Mark–Houwink constants were determined to be 7.52 × 10−4 and 0.473 for K and α respectively indicating that SSPS is a flexible random coil in solution. SAXS profiles revealed power law functions (I(q) ∼ q−α) with an exponent of −1 signifying the presence of rigid rods. Due to the overall large size of SSPS, it is thought that SAXS focused on single branches of SSPS. SAXS models confirmed that the nano-structural conformation of SSPS remains unaltered due to the presence of sodium nitrate salt, neither is the conformation affected by changes in pH nor concentration.
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