Interindividual Differences in Human Intestinal Microbial Conversion of (-)-Epicatechin to Bioactive Phenolic...

Area of Science:

• Microbiology
• Metabolomics
• Human Gut Microbiome

Background:

• (-)-Epicatechin (EC) is a flavanol found in various foods and beverages.
• Interindividual variability in the human gut microbiome can influence the metabolism of dietary compounds.
• Understanding EC metabolism is crucial for assessing its potential health benefits.

Purpose of the Study:

• To quantify interindividual differences in the human intestinal microbial metabolism of (-)-epicatechin (EC).
• To identify key intermediate microbial metabolites of EC.
• To explore correlations between gut microbiota composition and EC metabolite formation.

Main Methods:

• In vitro anaerobic incubations of EC with fecal inocula from 24 healthy donors.
• Analysis of EC-derived metabolites using liquid chromatography triple quadrupole mass spectrometry (LC-TQ-MS) and liquid chromatography time-of-flight mass spectrometry (LC-TOF-MS).
• Quantitative microbiota characterization via 16S rRNA gene sequencing.

Main Results:

• Identified 1-(3',4'-dihydroxyphenyl)-3-(2″,4″,6″-dihydroxyphenyl)-2-propanol (3,4-diHPP-2-ol) and 5-(3',4'-dihydroxyphenyl)-γ-valerolactone (3,4-diHPV) as key intermediate EC metabolites.
• Demonstrated substantial interindividual differences in the rate of EC conversion and time-dependent metabolite profiles.
• Revealed significant variations in gut microbiota composition among individuals and established correlations between specific microbial phylotypes and metabolite production.

Conclusions:

• Interindividual differences in intestinal microbial metabolism of EC are significant.
• Gut microbiota composition plays a key role in shaping EC metabolite patterns.
• Variations in EC metabolism may contribute to differing health effects of EC-containing foods and drinks.