Effects of orange juice formulation on prebiotic functionality using an in vitro colonic model system

Area of Science:

• Microbiology
• Nutritional Science
• Gastroenterology

Background:

• Prebiotics play a crucial role in modulating gut microbiota composition and function.
• Galactooligosaccharides (GOS) are recognized as effective prebiotics.
• Investigating novel delivery systems for prebiotics, such as functional beverages, is important.

Purpose of the Study:

• To evaluate the prebiotic activity of orange juice formulations supplemented with galactooligosaccharides (B-GOS).
• To assess the impact of B-GOS enriched orange juice on the human fecal microbiota in vitro.
• To determine the effect of B-GOS on microbial metabolism, specifically short-chain fatty acid (SCFA) production.

Main Methods:

• Utilized a three-stage continuous fermentative colonic model system.
• Assessed three orange juice formulations: control, positive control, and B-GOS supplemented juice.
• Analyzed microbiota composition using 16S rRNA-based fluorescence in situ hybridization (FISH) and SCFA profiles via gas chromatography.

Main Results:

• Sterilization processes did not significantly alter B-GOS or simple sugar concentrations.
• Fermentation of B-GOS enriched orange juice led to significant increases in fecal bifidobacteria and lactobacilli.
• B-GOS supplementation also promoted the Roseburia subcluster and increased beneficial butyrate production.

Conclusions:

• Orange juice can serve as an effective vehicle for delivering galactooligosaccharides (B-GOS) as a prebiotic.
• B-GOS enriched orange juice demonstrates a significant bifidogenic and lactobacilli-promoting effect in vitro.
• The study highlights the potential of B-GOS in orange juice to beneficially modulate gut microbiota composition and host-associated metabolic output.