Comparative Study on the In Vitro Fermentation Characteristics of Three Plant-Derived Polysaccharides with Different...

Area of Science:

• Food science and nutrition
• Microbiology
• Biochemistry

Background:

• Plant-derived polysaccharides are recognized for their health benefits, including prebiotic effects.
• Understanding the structure-activity relationship of these polysaccharides is crucial for optimizing their functional properties.
• Lycium barbarum polysaccharide (LBP), citrus pectin (CP), and peach gum polysaccharide (PGP) are common examples with varying structures.

Purpose of the Study:

• To investigate the relationship between the structural characteristics of LBP, CP, and PGP and their prebiotic functionalities.
• To determine how molecular weight, monosaccharide composition, and chain conformation influence gut microbiota fermentation and short-chain fatty acid (SCFA) production.

Main Methods:

• Structural analysis of LBP, CP, and PGP, including molecular weight determination and monosaccharide composition analysis.
• In vitro fermentation assays using gut microbiota to assess fermentation profiles and SCFA production.
• Correlation analysis between structural features and prebiotic effects.

Main Results:

• LBP (medium MW, rich in galactose/rhamnose) showed sustained fermentation and enhanced butyrate production.
• CP (low MW, linear glucan) was rapidly utilized, leading to propionate accumulation.
• PGP (ultra-high MW, branched arabinogalactan) promoted mid- to late-stage fermentation and increased butyrate yield.
• Functional differences were linked to monosaccharide composition, molecular weight distribution, and chain conformation.

Conclusions:

• The structural characteristics of plant-derived polysaccharides significantly dictate their prebiotic functionalities.
• Targeted development of prebiotics can be achieved by tailoring polysaccharide structure for specific metabolic outcomes, such as butyrate or propionate production.
• These findings provide a scientific foundation for designing functional foods and supplements with specific gut health benefits.