Chain conformations and steady-shear viscosity properties of pectic polysaccharides from apple and tomato.

ABSTRACT: In this study, apple pectin (AP) and tomato pectin (TP) were demonstrated to be a high-ester (74.8%) polysaccharide with the weight-average molecular weight (M_w ) of ∼ 243 kDa and a low-ester (45.9%) polysaccharide with the M_w of ∼ 19 kDa, respectively. The semi-rigid chain conformations of pectic polysaccharides in NaNO₃ aqueous solution were deduced according to the Smidsrød "B values" of AP (0.025) and TP (0.029), while AP and TP exhibited higher stiffness in water due to the electric repulsion of carboxyl groups, which was visually observed by AFM images. Under steady shear, the shear-thickening behaviors of AP and TP in NaNO₃ aqueous solutions were observed in the shear rate range of < 1 s^-1, which were attrib

SUBMITTER: Hu S 

PROVIDER: S-EPMC8976093 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature