The relationship between linear chain length distributions of amylopectin and the functional properties of the debranched starch-based films. (1st March 2022) - Tang, Jun
Abstract: The relationship between linear chain length distributions and the functional properties of the starch-based films after pullulanase debranching treatment of corn (CS), rice (RS) and wheat (WS) were investigated. The results indicated that the film thickness was negatively correlated with A chains content ( r = −0.939) and apparent amylose content ( r = −0.926), and was positively correlated with B3 chains content ( r = 0.847). The tensile strength of the debranched starch-based films were positively correlated with apparent amylose content ( r = 0.813), and the elongation at break were inversely proportional to B3 chains content ( r = −0.817). The hydrophobicity of the starch-based films was positively and negatively correlated with the proportions of linear chains with DP 6–12 ( r = 0.892) and DP 25–36 ( r = −0.863), respectively. On the contrary, no significant correlation was noticed between chain length distribution of amylopectin and transparency and thermal stability. Graphical abstract: Unlabelled Image Highlights: Pullulanase-modified starch film was prepared by solution casting method. The tensile strength was positively correlated with amylose content. The elongation at break was inversely proportional to the chains with the degree of polymerization (DP) ≥ 37. The surface hydrophobicity was proportional to the chains with DP between 6 and 12. The chains with DP between 6 and 24 were conducive to film formation.