Noninvasive monitoring of fibre fermentation in healthy volunteers by analyzing breath volatile metabolites: lessons from the FiberTAG intervention study

Audrey M Neyrinck, Julie Rodriguez, Zhengxiao Zhang, Benjamin Seethaler, Florence Mailleux, Joeri Vercammen, Laure B Bindels, Patrice D Cani, Julie-Anne Nazare, Véronique Maquet, Martine Laville, Stephan C Bischoff, Jens Walter, Nathalie M Delzenne, Audrey M Neyrinck, Julie Rodriguez, Zhengxiao Zhang, Benjamin Seethaler, Florence Mailleux, Joeri Vercammen, Laure B Bindels, Patrice D Cani, Julie-Anne Nazare, Véronique Maquet, Martine Laville, Stephan C Bischoff, Jens Walter, Nathalie M Delzenne

Abstract

The fermentation of dietary fibre (DF) leads to the production of bioactive metabolites, the most volatile ones being excreted in the breath. The aim of this study was to analyze the profile of exhaled breath volatile metabolites (BVM) and gastrointestinal symptoms in healthy volunteers after a single ingestion of maltodextrin (placebo) versus chitin-glucan (CG), an insoluble DF previously shown to be fermented into short-chain fatty acids (SCFA) by the human microbiota in vitro. Maltodextrin (4.5 g at day 0) or CG (4.5 g at day 2) were added to a standardized breakfast in fasting healthy volunteers (n = 15). BVM were measured using selected ion flow tube mass spectrometry (SIFT-MS) throughout the day. A single ingestion of 4.5 g CG did not induce significant gastrointestinal discomfort. Untargeted metabolomics analysis of breath highlighted that 13 MS-fragments (among 408 obtained from ionizations of breath) discriminated CG versus maltodextrin acute intake in the posprandial state. The targeted analysis revealed that CG increased exhaled butyrate and 5 other BVM - including the microbial metabolites 2,3-butanedione and 3-hydroxybutanone - with a peak observed 6 h after CG intake. Correlation analyses with fecal microbiota (Illumina 16S rRNA sequencing) spotlighted Mitsuokella as a potential genus responsible for the presence of butyric acid, triethylamine and 3-hydroxybutanone in the breath. In conclusion, measuring BMV in the breath reveals the microbial signature of the fermentation of DF after a single ingestion. This protocol allows to analyze the time-course of released bioactive metabolites that could be proposed as new biomarkers of DF fermentation, potentially linked to their biological properties. Trial registration: Clinical Trials NCT03494491. Registered 11 April 2018 - Retrospectively registered, https://ichgcp.net/clinical-trials-registry/NCT03494491.

Keywords: Gut microbiota; SCFA; breath volatile metabolites; chitin-glucan; fermentation; insoluble dietary fibre.

Figures

Figure 1.
Figure 1.
Overview of the study design
Figure 1.
Figure 1.
Overview of the study design
Figure 2.
Figure 2.
Gut microbiota and short-chain fatty acids (SCFA) composition in fecal matter of 15 healthy subjects before intervention days. (a) Principal coordinate analysis (PCoA) score plot of β-diversity estimated using the using the Bray-curtis and unweighted uniFrac indexes. (b) α-diversity indexes related to bacterial richness (Observed OTU), evenness (Pielou) or both (Shannon) for each subject. (c) Bar plots of relative abundance of phylum levels accounting for more than 0.5% for each subject. (d) Bar plots of SCFA concentration for each subject
Figure 2.
Figure 2.
Gut microbiota and short-chain fatty acids (SCFA) composition in fecal matter of 15 healthy subjects before intervention days. (a) Principal coordinate analysis (PCoA) score plot of β-diversity estimated using the using the Bray-curtis and unweighted uniFrac indexes. (b) α-diversity indexes related to bacterial richness (Observed OTU), evenness (Pielou) or both (Shannon) for each subject. (c) Bar plots of relative abundance of phylum levels accounting for more than 0.5% for each subject. (d) Bar plots of SCFA concentration for each subject
Figure 3.
Figure 3.
Gastrointestinal tolerance assessed by visual analog scale of 15 healthy subjects about 8 symptoms after chitin-glucan intake of maltodextrin intake. Data are means ± SEM (p > .05; matched-pairs Wilcoxon signed-rank test on net AUC)
Figure 3.
Figure 3.
Gastrointestinal tolerance assessed by visual analog scale of 15 healthy subjects about 8 symptoms after chitin-glucan intake of maltodextrin intake. Data are means ± SEM (p > .05; matched-pairs Wilcoxon signed-rank test on net AUC)
Figure 4.
Figure 4.
Untargeted analysis of breath from 15 healthy subjects after chitin-glucan and maltodextrin intake. Principal component analysis (PCA) score plot of the MS-fragments from the SIFT-MS spectra (from H3O+, NO+ and O2+ ionizations) obtained in fasted state (time 0 h) the first test day (a) or in fasted state (time 0 h), in pre-prandial state (time 4 h) and in postprandial state (time 6 h) (b). PLS-DA (with cutoff 0.9) of 408 MS-fragments after chitin-glucan intake and maltodextrin intake at time 6 h (c). Statistical analysis was assessed by a Monte Carlo rank test
Figure 4.
Figure 4.
Untargeted analysis of breath from 15 healthy subjects after chitin-glucan and maltodextrin intake. Principal component analysis (PCA) score plot of the MS-fragments from the SIFT-MS spectra (from H3O+, NO+ and O2+ ionizations) obtained in fasted state (time 0 h) the first test day (a) or in fasted state (time 0 h), in pre-prandial state (time 4 h) and in postprandial state (time 6 h) (b). PLS-DA (with cutoff 0.9) of 408 MS-fragments after chitin-glucan intake and maltodextrin intake at time 6 h (c). Statistical analysis was assessed by a Monte Carlo rank test
Figure 5.
Figure 5.
Targeted short-chain fatty acids (SCFA) concentrations (changes from baseline) exhaled in breath of healthy subjects in response to chitin-glucan and maltodextrin intake. Data are means ± SEM (*p 

Figure 5.

Targeted short-chain fatty acids (SCFA)…

Figure 5.

Targeted short-chain fatty acids (SCFA) concentrations (changes from baseline) exhaled in breath of…

Figure 5.
Targeted short-chain fatty acids (SCFA) concentrations (changes from baseline) exhaled in breath of healthy subjects in response to chitin-glucan and maltodextrin intake. Data are means ± SEM (*p 

Figure 6.

Targeted breath volatile metabolites (BVM)…

Figure 6.

Targeted breath volatile metabolites (BVM) concentrations (changes from baseline) exhaled in breath of…

Figure 6.
Targeted breath volatile metabolites (BVM) concentrations (changes from baseline) exhaled in breath of healthy subjects significantly changed after chitin-glucan intake compared to maltodextrin intake. Data are means ± SEM (*p 

Figure 6.

Targeted breath volatile metabolites (BVM)…

Figure 6.

Targeted breath volatile metabolites (BVM) concentrations (changes from baseline) exhaled in breath of…

Figure 6.
Targeted breath volatile metabolites (BVM) concentrations (changes from baseline) exhaled in breath of healthy subjects significantly changed after chitin-glucan intake compared to maltodextrin intake. Data are means ± SEM (*p 
All figures (12)
Similar articles
Cited by
References
    1. Stephen AM, Champ MM, Cloran SJ, Fleith M, van Lieshout L, Mejborn H, Burley VJ.. Dietary fibre in Europe: current state of knowledge on definitions, sources, recommendations, intakes and relationships to health. Nutr Res Rev. 2017;30:149–190. doi:10.1017/S095442241700004X. - DOI - PubMed
    1. EFSA . Scientific opinion on the substantiation of health claims related to dietary fibre (ID 744, 745, 746, 748, 749, 753, 803, 810, 855, 1415, 1416, 4308, 4330) pursuant to article 13(1) of regulation (EC)No 1924/20061. EFSA Journal. 2010;8:1735. doi:10.2903/j.efsa.2010.1735. - DOI
    1. Gibson GR, Hutkins R, Sanders ME, Prescott SL, Reimer RA, Salminen SJ, Scott K, Stanton C, Swanson KS, Cani PD, et al. Expert consensus document: the international scientific association for probiotics and prebiotics (ISAPP) consensus statement on the definition and scope of prebiotics. Nat Rev Gastroenterol Hepatol. 2017;14:491–502. doi:10.1038/nrgastro.2017.75. - DOI - PubMed
    1. EFSA Panel on Dietetic Products NaAN . Scientific opinion on the safety of ‘Chitin-glucan’ as a novel food ingredient. EFSA Journal. 2010;8:1687. doi:10.2903/j.efsa.2010.1687. - DOI
    1. Marzorati MMV, Possemiers S. Fate of chitin-glucan in the human gastrointestinal tract as studied in a dynamic gut simulator (SHIME). J Funct Foods. 2017;30:313–320. doi:10.1016/j.jff.2017.01.030. - DOI
Show all 42 references
Publication types
MeSH terms
Associated data
Grant support
FiberTAG project was initiated from a European Joint Programming Initiative “A Healthy Diet for a Healthy Life” (JPI HDHL). This work was supported by the Service Public de Wallonie (SPW-EER, convention 1610365, Belgium). NMD is a recipient of grants from Fond de la Recherche Scientifique (FRS-FNRS, convention PINT-MULTI R.8013.19 (NEURON, call 2019) and convention PDR T.0068.19) and from UCLouvain (Action de Recherche Concertée ARC18-23/092). SCB is a recipient of a grant from the German Federal Ministry for Education and Research (BMBF, Germany, ID: 01EA1701). PDC is supported by the Fonds Baillet Latour (Grant for Medical Research 2015), the Fonds de la Recherche Scientifique (FNRS, FRFS-WELBIO: WELBIO-CR-2019C-02R, and EOS program no. 30770923).
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Figure 5.
Figure 5.
Targeted short-chain fatty acids (SCFA) concentrations (changes from baseline) exhaled in breath of healthy subjects in response to chitin-glucan and maltodextrin intake. Data are means ± SEM (*p 

Figure 6.

Targeted breath volatile metabolites (BVM)…

Figure 6.

Targeted breath volatile metabolites (BVM) concentrations (changes from baseline) exhaled in breath of…

Figure 6.
Targeted breath volatile metabolites (BVM) concentrations (changes from baseline) exhaled in breath of healthy subjects significantly changed after chitin-glucan intake compared to maltodextrin intake. Data are means ± SEM (*p 

Figure 6.

Targeted breath volatile metabolites (BVM)…

Figure 6.

Targeted breath volatile metabolites (BVM) concentrations (changes from baseline) exhaled in breath of…

Figure 6.
Targeted breath volatile metabolites (BVM) concentrations (changes from baseline) exhaled in breath of healthy subjects significantly changed after chitin-glucan intake compared to maltodextrin intake. Data are means ± SEM (*p 
All figures (12)
Similar articles
Cited by
References
    1. Stephen AM, Champ MM, Cloran SJ, Fleith M, van Lieshout L, Mejborn H, Burley VJ.. Dietary fibre in Europe: current state of knowledge on definitions, sources, recommendations, intakes and relationships to health. Nutr Res Rev. 2017;30:149–190. doi:10.1017/S095442241700004X. - DOI - PubMed
    1. EFSA . Scientific opinion on the substantiation of health claims related to dietary fibre (ID 744, 745, 746, 748, 749, 753, 803, 810, 855, 1415, 1416, 4308, 4330) pursuant to article 13(1) of regulation (EC)No 1924/20061. EFSA Journal. 2010;8:1735. doi:10.2903/j.efsa.2010.1735. - DOI
    1. Gibson GR, Hutkins R, Sanders ME, Prescott SL, Reimer RA, Salminen SJ, Scott K, Stanton C, Swanson KS, Cani PD, et al. Expert consensus document: the international scientific association for probiotics and prebiotics (ISAPP) consensus statement on the definition and scope of prebiotics. Nat Rev Gastroenterol Hepatol. 2017;14:491–502. doi:10.1038/nrgastro.2017.75. - DOI - PubMed
    1. EFSA Panel on Dietetic Products NaAN . Scientific opinion on the safety of ‘Chitin-glucan’ as a novel food ingredient. EFSA Journal. 2010;8:1687. doi:10.2903/j.efsa.2010.1687. - DOI
    1. Marzorati MMV, Possemiers S. Fate of chitin-glucan in the human gastrointestinal tract as studied in a dynamic gut simulator (SHIME). J Funct Foods. 2017;30:313–320. doi:10.1016/j.jff.2017.01.030. - DOI
Show all 42 references
Publication types
MeSH terms
Associated data
Grant support
FiberTAG project was initiated from a European Joint Programming Initiative “A Healthy Diet for a Healthy Life” (JPI HDHL). This work was supported by the Service Public de Wallonie (SPW-EER, convention 1610365, Belgium). NMD is a recipient of grants from Fond de la Recherche Scientifique (FRS-FNRS, convention PINT-MULTI R.8013.19 (NEURON, call 2019) and convention PDR T.0068.19) and from UCLouvain (Action de Recherche Concertée ARC18-23/092). SCB is a recipient of a grant from the German Federal Ministry for Education and Research (BMBF, Germany, ID: 01EA1701). PDC is supported by the Fonds Baillet Latour (Grant for Medical Research 2015), the Fonds de la Recherche Scientifique (FNRS, FRFS-WELBIO: WELBIO-CR-2019C-02R, and EOS program no. 30770923).
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Figure 6.
Figure 6.
Targeted breath volatile metabolites (BVM) concentrations (changes from baseline) exhaled in breath of healthy subjects significantly changed after chitin-glucan intake compared to maltodextrin intake. Data are means ± SEM (*p 

Figure 6.

Targeted breath volatile metabolites (BVM)…

Figure 6.

Targeted breath volatile metabolites (BVM) concentrations (changes from baseline) exhaled in breath of…

Figure 6.
Targeted breath volatile metabolites (BVM) concentrations (changes from baseline) exhaled in breath of healthy subjects significantly changed after chitin-glucan intake compared to maltodextrin intake. Data are means ± SEM (*p 
All figures (12)
Similar articles
Cited by
References
    1. Stephen AM, Champ MM, Cloran SJ, Fleith M, van Lieshout L, Mejborn H, Burley VJ.. Dietary fibre in Europe: current state of knowledge on definitions, sources, recommendations, intakes and relationships to health. Nutr Res Rev. 2017;30:149–190. doi:10.1017/S095442241700004X. - DOI - PubMed
    1. EFSA . Scientific opinion on the substantiation of health claims related to dietary fibre (ID 744, 745, 746, 748, 749, 753, 803, 810, 855, 1415, 1416, 4308, 4330) pursuant to article 13(1) of regulation (EC)No 1924/20061. EFSA Journal. 2010;8:1735. doi:10.2903/j.efsa.2010.1735. - DOI
    1. Gibson GR, Hutkins R, Sanders ME, Prescott SL, Reimer RA, Salminen SJ, Scott K, Stanton C, Swanson KS, Cani PD, et al. Expert consensus document: the international scientific association for probiotics and prebiotics (ISAPP) consensus statement on the definition and scope of prebiotics. Nat Rev Gastroenterol Hepatol. 2017;14:491–502. doi:10.1038/nrgastro.2017.75. - DOI - PubMed
    1. EFSA Panel on Dietetic Products NaAN . Scientific opinion on the safety of ‘Chitin-glucan’ as a novel food ingredient. EFSA Journal. 2010;8:1687. doi:10.2903/j.efsa.2010.1687. - DOI
    1. Marzorati MMV, Possemiers S. Fate of chitin-glucan in the human gastrointestinal tract as studied in a dynamic gut simulator (SHIME). J Funct Foods. 2017;30:313–320. doi:10.1016/j.jff.2017.01.030. - DOI
Show all 42 references
Publication types
MeSH terms
Associated data
Grant support
FiberTAG project was initiated from a European Joint Programming Initiative “A Healthy Diet for a Healthy Life” (JPI HDHL). This work was supported by the Service Public de Wallonie (SPW-EER, convention 1610365, Belgium). NMD is a recipient of grants from Fond de la Recherche Scientifique (FRS-FNRS, convention PINT-MULTI R.8013.19 (NEURON, call 2019) and convention PDR T.0068.19) and from UCLouvain (Action de Recherche Concertée ARC18-23/092). SCB is a recipient of a grant from the German Federal Ministry for Education and Research (BMBF, Germany, ID: 01EA1701). PDC is supported by the Fonds Baillet Latour (Grant for Medical Research 2015), the Fonds de la Recherche Scientifique (FNRS, FRFS-WELBIO: WELBIO-CR-2019C-02R, and EOS program no. 30770923).
[x]
Cite
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Format: AMA APA MLA NLM
Figure 6.
Figure 6.
Targeted breath volatile metabolites (BVM) concentrations (changes from baseline) exhaled in breath of healthy subjects significantly changed after chitin-glucan intake compared to maltodextrin intake. Data are means ± SEM (*p 
All figures (12)

References

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    1. EFSA . Scientific opinion on the substantiation of health claims related to dietary fibre (ID 744, 745, 746, 748, 749, 753, 803, 810, 855, 1415, 1416, 4308, 4330) pursuant to article 13(1) of regulation (EC)No 1924/20061. EFSA Journal. 2010;8:1735. doi:10.2903/j.efsa.2010.1735.
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Source: PubMed

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