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Evaluation of the Bioavailability of Amino Acids From Purple Bacteria (PROTEBOOST_1)

21 maj 2026 uppdaterad av: Université Catholique de Louvain

Evaluation of the Consumption of Fresh Purple Bacteria Biomass in Healthy Humans: Safety Test and Monitoring of Metabolism

This interventional clinical study aims to evaluate the bioavailability of amino acids derived from purple bacteria in healthy adults. Participants will consume either a protein-enriched dairy product or a protein-enriched dairy product containing purple bacteria during two separate test periods in a randomized cross-over design. Blood amino acid concentrations will be measured over a 4-hour postprandial period to assess amino acid absorption and bioavailability.

Additional biological samples including saliva, exhaled air, and feces will be collected to evaluate gastrointestinal hormones, volatilome profiles, and related metabolic responses.

Studieöversikt

Status

Avslutad

Betingelser

Intervention / Behandling

Detaljerad beskrivning

Purple bacteria are recognized for their high-quality protein content, including essential amino acids, as well as their vitamin and carotenoid composition. However, limited data are available regarding the bioavailability of amino acids derived from purple bacteria in humans.

This randomized, open-label, cross-over study will enroll approximately 12 healthy adult participants in Belgium. Each participant will receive two dairy-based formulations in randomized order:

Control formulation: protein-enriched dairy product. Test formulation: protein-enriched dairy product containing purple bacteria.

The two intervention periods will be separated by a washout period of at least one week.

Participants will undergo one screening visit and two test visits. During each test visit, serial blood samples will be collected over 240 minutes following ingestion of the assigned formulation to determine plasma amino acid concentrations. Additional saliva, exhaled air, and fecal samples will also be collected.

The primary objective is to determine whether amino acids present in purple bacteria are better absorbed than amino acids from other protein sources.

Studietyp

Interventionell

Inskrivning (Faktisk)

12

Fas

  • Inte tillämpbar

Kontakter och platser

Det här avsnittet innehåller kontaktuppgifter för dem som genomför studien och information om var denna studie genomförs.

Studieorter

      • Louvain-la-Neuve, Belgien, 1348
        • Center of Investigation in Clinical Nutrition (CICN)

Deltagandekriterier

Forskare letar efter personer som passar en viss beskrivning, så kallade behörighetskriterier. Några exempel på dessa kriterier är en persons allmänna hälsotillstånd eller tidigare behandlingar.

Urvalskriterier

Åldrar som är berättigade till studier

  • Vuxen

Tar emot friska volontärer

Ja

Beskrivning

Inclusion Criteria:

  • Adults aged 18 to 50 years
  • Body mass index between 18 and 30 kg/m²
  • Healthy participants
  • Non-smokers
  • Women of childbearing potential using effective contraception
  • Able to understand and speak French
  • Willing and able to comply with study procedures

Exclusion Criteria:

  • Pregnancy or breastfeeding
  • Use of medications or dietary supplements incompatible with study participation
  • Any medical condition considered by the investigator to interfere with study participation or interpretation of results
  • Vegan or vegetarian diets

Studieplan

Det här avsnittet ger detaljer om studieplanen, inklusive hur studien är utformad och vad studien mäter.

Hur är studien utformad?

Designdetaljer

  • Primärt syfte: Grundläggande vetenskap
  • Tilldelning: Randomiserad
  • Interventionsmodell: Crossover tilldelning
  • Maskning: Enda

Vapen och interventioner

Deltagargrupp / Arm
Intervention / Behandling
Experimentell: Purple Bacteria Formulation
Participants will consume a protein-enriched dairy product containing purple bacteria.
Approximately 50 g of purple bacteria incorporated into approximately 110 g of a protein-enriched dairy product.
Aktiv komparator: Control Formulation
Participants will consume a protein-enriched dairy product without purple bacteria.
160 g of protein-enriched dairy product.

Vad mäter studien?

Primära resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
Change in postprandial plasma essential amino acid concentrations (µmol/L)
Tidsram: Throughout the entire study, approxiamtely during 1 month
Plasma concentrations of essential amino acids (including leucine, isoleucine, valine, lysine, threonine, phenylalanine, methionine, tryptophan, and histidine) will be measured using LC-MS/MS at baseline and at multiple postprandial time points following ingestion of control and test formulations. Results will be reported as incremental area under the curve (iAUC, µmol/L·h) over the postprandial period.
Throughout the entire study, approxiamtely during 1 month

Sekundära resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
Change in exhaled volatile organic compounds (VOCs) profile (relative abundance, arbitrary units)
Tidsram: Throughout the entire study, approxiamtely during 1 month
Exhaled air samples will be analyzed using gas chromatography-mass spectrometry (GC-MS). Specific VOCs will be quantified and reported as relative abundance (arbitrary units) and/or multivariate profile changes (e.g., PCA scores) comparing test vs control formulations.
Throughout the entire study, approxiamtely during 1 month
Change in salivary gastrointestinal hormone concentrations (pg/mL)
Tidsram: Throughout the entire study, approxiamtely during 1 month
Salivary concentrations of gastrointestinal hormones (e.g., ghrelin, GLP-1, PYY) will be measured using immunoassays. Results will be expressed as change from baseline and iAUC (pg/mL·h) over the postprandial period.
Throughout the entire study, approxiamtely during 1 month
Gastrointestinal symptom severity score assessed using a 5-point Likert scale (0-4)
Tidsram: Throughout the entire study, approxiamtely during 1 month

Gastrointestinal tolerance will be assessed using a standardized symptom questionnaire evaluating the severity of gastrointestinal symptoms (including bloating, abdominal pain, flatulence, nausea, and diarrhea).

Each symptom will be rated using a 5-point Likert scale, defined as:

0 = not at all

  1. = slightly
  2. = moderately
  3. = severely
  4. = very severely

Results will be reported as:

mean gastrointestinal symptom score (average across symptoms) and/or total symptom score (sum of all items; higher scores indicate worse symptoms) and change from baseline over the postprandial period following ingestion of study formulations.

Throughout the entire study, approxiamtely during 1 month
Number of participants with at least one adverse event
Tidsram: Throughout the entire study, approxiamtely during 1 month
Adverse events will be collected throughout the study period and reported as the number and proportion of participants experiencing at least one adverse event, by condition.
Throughout the entire study, approxiamtely during 1 month

Andra resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
Perceived stress score assessed using the Perceived Stress Scale (PSS-10; range 0-40)
Tidsram: Throughout the entire study, approxiamtely during 1 month

Perceived stress will be assessed using the Perceived Stress Scale (10-item version, PSS-10), a validated questionnaire measuring the degree to which situations in one's life are appraised as stressful.

The total score ranges from:

0 to 40, with higher scores indicating higher perceived stress

Results will be reported as:

mean total PSS score change from baseline over the study period and/or between-group differences following ingestion of the study formulations.

Throughout the entire study, approxiamtely during 1 month

Samarbetspartners och utredare

Det är här du hittar personer och organisationer som är involverade i denna studie.

Sponsor

Samarbetspartners

Utredare

  • Huvudutredare: Sylvie Copine, Dr, Université Catholique de Louvain
  • Huvudutredare: Laurent Simar, Dr, Université Catholique de Louvain

Studieavstämningsdatum

Dessa datum spårar framstegen för inlämningar av studieposter och sammanfattande resultat till ClinicalTrials.gov. Studieposter och rapporterade resultat granskas av National Library of Medicine (NLM) för att säkerställa att de uppfyller specifika kvalitetskontrollstandarder innan de publiceras på den offentliga webbplatsen.

Studera stora datum

Studiestart (Faktisk)

13 april 2026

Primärt slutförande (Faktisk)

8 maj 2026

Avslutad studie (Faktisk)

8 maj 2026

Studieregistreringsdatum

Först inskickad

4 maj 2026

Först inskickad som uppfyllde QC-kriterierna

21 maj 2026

Första postat (Faktisk)

29 maj 2026

Uppdateringar av studier

Senaste uppdatering publicerad (Faktisk)

29 maj 2026

Senaste inskickade uppdateringen som uppfyllde QC-kriterierna

21 maj 2026

Senast verifierad

1 maj 2026

Mer information

Termer relaterade till denna studie

Andra studie-ID-nummer

  • PROTEBOOST_BIODISPO1

Plan för individuella deltagardata (IPD)

Planerar du att dela individuella deltagardata (IPD)?

NEJ

Läkemedels- och apparatinformation, studiedokument

Studerar en amerikansk FDA-reglerad läkemedelsprodukt

Nej

Studerar en amerikansk FDA-reglerad produktprodukt

Nej

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