# Bioinformatic Insights into the Carotenoids’ Role in Gut Microbiota Dynamics

## TL;DR

This study shows how different carotenoids affect gut microbes, revealing their potential in shaping gut health through diet.

## Contribution

The study links carotenoid chemistry to specific microbial responses, offering a new framework for functional food development.

## Key findings

- β-carotene and lycopene promote acid-tolerant bacteria like Escherichia-Shigella.
- Lutein causes transient microbial fluctuations due to its polarity.
- Carotenoid mixtures and algal extracts support beneficial genera like Bifidobacterium and Bacteroides.

## Abstract

Background/Objectives: Carotenoids are bioactive pigments with well-established antioxidant and immunomodulatory properties, yet their impact on gut microbiota remains poorly understood from a chemical standpoint. This study explores how carotenoid structure and gastrointestinal stability shape microbial responses combining in vitro fermentation with bioinformatic analyses. Methods: Individual carotenoids (beta (β)-carotene, lutein, lycopene) and combined carotenoids, as well as algal-derived extracts were subjected to 48 h in vitro fermentation, and microbial composition and activity were assessed through sequencing and computational analysis. Results: β-carotene and lycopene promoted acid-tolerant taxa such as Escherichia-Shigella, whereas lutein, due to its higher polarity, supported more transient fluctuations. Mixtures and algal carotenoids exhibited synergistic effects, sustaining beneficial genera including Bifidobacterium and Bacteroides and promoting structured ecological trajectories. Conclusions: These findings provide a chemistry-driven perspective on how carotenoids act as modulators of microbial ecosystems, with direct implications for the formulation of carotenoid-enriched functional foods and dietary interventions.