Interaction between amylose/amylopectin and polyphenols of different structures.

Area of Science:

• Food Science and Technology
• Biochemistry
• Materials Science

Background:

• Polyphenols are plant-derived compounds with diverse biological activities.
• Starch, composed of amylose and amylopectin, is a key carbohydrate in food and biomaterials.
• Understanding starch-polyphenol interactions is crucial for food processing and delivery systems.

Purpose of the Study:

• To systematically elucidate the interaction mechanisms between four polyphenols (catechin, EGCG, C3G, ferulic acid) and starch components (amylose, amylopectin).
• To investigate the impact of these interactions on starch structure, aggregation, and physicochemical properties.
• To provide atomistic insights into starch-polyphenol binding using integrated experimental and computational methods.

Main Methods:

• Experimental characterization including LCM-Raman spectroscopy and FTIR analysis.
• Molecular dynamics (MD) simulations to probe binding mechanisms at the atomic level.
• Quantification of binding capacities and analysis of structural changes in starch.

Main Results:

• Catechin (CC) and epigallocatechin gallate (EGCG) showed the highest binding capacities for amylose/amylopectin.
• Polyphenols induced starch chain aggregation, increased particle sizes, and reduced short-range order.
• MD simulations revealed polyphenols disrupt helical structures and crosslink starch chains via hydrogen bonds and electrostatic forces.

Conclusions:

• Binding affinity correlates with the number of hydroxyl groups in polyphenols (FA < CC < EGCG).
• Cyanidin-3-O-glucoside (C3G) interacts primarily through electrostatic forces as a flavylium cation.
• This study provides novel atomistic insights into starch-polyphenol interactions, valuable for designing advanced starch-based delivery systems.