What question did this study set out to answer?

This research aims to understand how the molecular weight of amylose influences the structure and digestibility of starch-lauric acid complexes and their effects on gut microbiota.

April 4, 2026Journal of Agricultural and Food Chemistry0 citations

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Regulation of Starch–Lauric Acid Complex Properties by Amylose Molecular Weight: Structure, Digestibility, and Gut Microbiota Fermentation

MZMeng-ge ZhangFujian Normal University ZLZhaofeng LiJiangnan University ZGZhengbiao GuJiangnan University

Key Points

This research aims to understand how the molecular weight of amylose influences the structure and digestibility of starch-lauric acid complexes and their effects on gut microbiota.
Constructed amylose-lipid complexes from high-MW and low-MW amylose with lauric acid.
Utilized an in vitro digestion-fermentation model to assess the properties of these complexes.
Compared resistant starch content and structural integrity post-digestion.
CGK-based complexes had a higher resistant starch content of 46.09%.
Digested HCK residue maintained a more robust crystalline structure.
HCK complexes promoted beneficial gut bacteria like Bifidobacterium and Prevotella while suppressing pathogens like Proteobacteria.

Abstract

The molecular weight (MW) of amylose is a critical determinant of the structure and functionality of amylose-lipid complexes (RS5). This study investigated complexes constructed from high-MW (HCK) and low-MW (CGK) amylose with lauric acid by using an in vitro digestion-fermentation model. A distinct paradox emerged: while CGK-based complexes exhibited a higher initial resistant starch content (46.09%), the digested HCK residue retained a more robust crystalline architecture. Mechanistically, this structural preservation rendered digested HCK a superior prebiotic substrate, significantly promoting beneficial taxa (e.g., Bifidobacterium and Prevotella) and suppressing pathogens (Proteobacteria) compared to the low-MW counterpart. These findings demonstrate that amylose MW is a pivotal parameter for engineering RS5: low-MW amylose maximizes the RS yield for glycemic management, whereas high-MW amylose constructs robust complexes for targeted gut microbiota modulation.

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Cite This Study

Zhang et al. (Thu,) studied this question.

synapsesocial.com/papers/69d0aeb9659487ece0fa49dd https://doi.org/https://doi.org/10.1021/acs.jafc.5c14062

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