Component

Human myeloperoxidase / MPO

Human myeloperoxidase / MPO. Species, exposure and limitations are retained in each linked claim.

13 recorded relationships. Experimental role, claim status and evidence remain attached to each record.

Read recorded mechanisms Open recursive mind map

How nutrients influence it

Every nutrient with a recorded effect on this component, credited to the nutrient that acted rather than the chapter that recorded it. Open a nutrient to see the findings and the conditions they were measured under.

How nutrients reach it in more than one step

Chains of two or more recorded steps that end here, grouped by the nutrient they start from. Each step is a separate finding, so a chain is a route a mechanism could take, not proof that it does.

Tracing routes…

What it does

Every recorded relationship this component is part of, grouped by its role. Plain wording comes first; the technical statement follows.

Recorded relationships

What it acts on

  1. Purified myeloperoxidase plus hydrogen peroxide, chloride and taurine generated taurine chloramine; removing chloride or peroxide, or inhibiting MPO, blocked generation.

    Human myeloperoxidase / MPO → Taurine chloramine / TauCl source_derived_draftungraded
    Experimental context and source evidence
    evidence_access
    Primary abstract
    experimental_model
    Purified human MPO system and stimulated human neutrophils.
    limitations
    Taurine chloramine remains an oxidant; free taurine is not equivalent to every chloramine effect.
    nutrient_topic
    Taurine collection; molecular form, preparation, species, exposure and manipulation remain explicit. · Taurine
    plain_language
    An immune-cell oxidant reacts with taurine to make a different active molecule.
    primary_references
    Chlorination of taurine by human neutrophils. Evidence for hypochlorous acid generation. · 1982 · https://pubmed.ncbi.nlm.nih.gov/6286728/ · DOI 10.1172/jci110652

    Taurine: synthesis, transport, mitochondrial decoding and nutrient interactions (2026-09-19) · lines 361–367

    AI-assisted research curation; primary-abstract references and experimental limitations individually identified. Not publisher full text. · supports · Purified human MPO system and stimulated human neutrophils. · source_derived_draft · unverified_draft

    ## taurine-mpo-chlorination An immune-cell oxidant reacts with taurine to make a different active molecule. Purified myeloperoxidase plus hydrogen peroxide, chloride and taurine generated taurine chloramine; removing chloride or peroxide, or inhibiting MPO, blocked generation. Model: Purified human MPO system and stimulated human neutrophils. Limitations: Taurine chloramine remains an oxidant; free taurine is not equivalent to every chloramine effect. Evidence access: Primary abstract Chlorination of taurine by human neutrophils. Evidence for hypochlorous acid generation. · 1982 · https://pubmed.ncbi.nlm.nih.gov/6286728/ · DOI 10.1172/jci110652
    Complete structured claim and evidence

  2. Human myeloperoxidase with hydrogen peroxide oxidized eugenol toward a reactive intermediate consistent with a quinone methide.

    Human myeloperoxidase / MPO → Eugenol source_derived_draftungraded
    Experimental context and source evidence
    dose
    Eugenol with peroxidase and hydrogen peroxide
    duration
    Acute
    evidence_access
    Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.
    evidence_scope
    literature_reviewed; model-specific source-derived curation
    experimental_model
    Purified human MPO and activated human polymorphonuclear leukocytes
    limitations
    The reactive intermediate was inferred from chemistry; ordinary dietary exposure and organ-specific dose were not established.
    nutrient_topic
    Eugenol chapter; interacting nutrients, drugs, peptides and proteins retain their experimental settings. · Eugenol
    organism
    Purified human MPO and activated human polymorphonuclear leukocytes
    plain_language
    Human myeloperoxidase with hydrogen peroxide oxidized eugenol toward a reactive intermediate consistent with a quinone methide.
    primary_references
    Metabolic activation of eugenol by myeloperoxidase and polymorphonuclear leukocytes. (1989). https://pubmed.ncbi.nlm.nih.gov/2562421/ DOI: 10.1021/tx00009a011
    route
    In vitro
    tissue
    Reactive-metabolite formation and protein binding

    Eugenol: mechanism of action and interactions (2026-09-20) · lines 88–97

    Original AI-assisted source-specific curation with primary-study citations, model, exposure, route, duration, negative findings and limitations preserved. Not publisher full text. · supports · Purified human MPO and activated human polymorphonuclear leukocytes · source_derived_draft · unverified_draft

    ## eugenol-mpo-activation Human myeloperoxidase with hydrogen peroxide oxidized eugenol toward a reactive intermediate consistent with a quinone methide. Model/species: Purified human MPO and activated human polymorphonuclear leukocytes Tissue/system: Reactive-metabolite formation and protein binding Exposure: Eugenol with peroxidase and hydrogen peroxide Route: In vitro Duration: Acute Limits: The reactive intermediate was inferred from chemistry; ordinary dietary exposure and organ-specific dose were not established. Primary reference: Metabolic activation of eugenol by myeloperoxidase and polymorphonuclear leukocytes. (1989). https://pubmed.ncbi.nlm.nih.gov/2562421/ DOI: 10.1021/tx00009a011 Access: Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.
    Complete structured claim and evidence

  3. Myeloperoxidase used hydrogen peroxide to oxidize chloride to hypochlorous acid.

    Human myeloperoxidase / MPO → Hypochlorous acid / HOCl source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/chloride-research/9359420.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "83dc6a264dfb45201104568ac58c76509aaa0fabca1f32efd25861146b4b38c0", "start_char": 0, "end_char": 1700, "text_sha256": "83dc6a264dfb45201104568ac58c76509aaa0fabca1f32efd25861146b4b38c0"}
    experimental_model
    Purified-enzyme substrate kinetics
    exposure
    100 mM chloride with varying thiocyanate
    limitations
    Product chemistry under assay conditions; not a recommendation to raise chloride or thiocyanate intake.
    nutrient_topic
    Chloride research collection; topical membership is not evidence of a direct dietary effect. · Chloride
    organism
    Human neutrophil enzyme
    plain_language
    Immune chemistry can convert chloride into a reactive antimicrobial oxidant.
    primary_references
    [chloride-p9359420] Thiocyanate and chloride as competing substrates for myeloperoxidase. (1997). https://pubmed.ncbi.nlm.nih.gov/9359420/ DOI: 10.1042/bj3270487
    tissue_or_cell_type
    Myeloperoxidase reaction mixture

    Chloride: transport, acid-base balance, nutrient interactions and loss states (2026-09-17) · lines 614–625

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Purified-enzyme substrate kinetics · source_derived_draft · unverified_draft

    ### chloride-mpo-hocl Myeloperoxidase used hydrogen peroxide to oxidize chloride to hypochlorous acid. Condition category: normal nutrient_topic: Chloride research collection; topical membership is not evidence of a direct dietary effect. plain_language: Immune chemistry can convert chloride into a reactive antimicrobial oxidant. organism: Human neutrophil enzyme tissue_or_cell_type: Myeloperoxidase reaction mixture experimental_model: Purified-enzyme substrate kinetics limitations: Product chemistry under assay conditions; not a recommendation to raise chloride or thiocyanate intake. exposure: 100 mM chloride with varying thiocyanate evidence_span: {"source_cache": "artifacts/chloride-research/9359420.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "83dc6a264dfb45201104568ac58c76509aaa0fabca1f32efd25861146b4b38c0", "start_char": 0, "end_char": 1700, "text_sha256": "83dc6a264dfb45201104568ac58c76509aaa0fabca1f32efd25861146b4b38c0"} [chloride-p9359420] Thiocyanate and chloride as competing substrates for myeloperoxidase. (1997). https://pubmed.ncbi.nlm.nih.gov/9359420/ DOI: 10.1042/bj3270487
    Complete structured claim and evidence

What acts on it

  1. Betanin stimulated or inhibited MPO chlorination at neutral pH depending on concentration; at pH 5 only inhibition was observed.

    Betanin → Human myeloperoxidase / MPO source_derived_draftungraded
    Experimental context and source evidence
    dose
    Micromolar substrates; concentration-dependent chlorination assays
    duration
    Rapid kinetic measurements at 25 degrees C; pH 7.0 and pH 5.0
    evidence_access
    Primary PubMed abstract; detailed exposure for PMID 23931157 additionally checked in publisher results. No uninspected full text is claimed.
    evidence_scope
    literature_reviewed; source-derived curation, not universally established human effects
    experimental_model
    Purified human myeloperoxidase; cell-free chemistry
    limitations
    MPO substrates can stimulate or inhibit chlorination depending on conditions; not a universal MPO inhibitor.
    nutrient_topic
    Betalains collection; each molecular form, species, exposure and preparation remains explicit. · Betalains
    organism
    Purified human myeloperoxidase; cell-free chemistry
    plain_language
    Betanin stimulated or inhibited MPO chlorination at neutral pH depending on concentration; at pH 5 only inhibition was observed.
    primary_references
    Mechanism of interaction of betanin and indicaxanthin with human myeloperoxidase and hypochlorous acid. (2005). https://pubmed.ncbi.nlm.nih.gov/15913556/ DOI: 10.1016/j.bbrc.2005.05.031
    route
    In vitro reagent addition
    tissue
    MPO redox cycle and HOCl solution

    Betalains: mechanisms, molecular forms and cross-actor connections (2026-09-20) · lines 137–145

    Original AI-assisted curation of twelve primary research papers; study-specific PubMed/DOI links and limitations retained. Not publisher full text. · supports · Purified human myeloperoxidase; cell-free chemistry · source_derived_draft · unverified_draft

    ## betalains-betanin-chlorination Betanin stimulated or inhibited MPO chlorination at neutral pH depending on concentration; at pH 5 only inhibition was observed. Model/species: Purified human myeloperoxidase; cell-free chemistry Tissue: MPO redox cycle and HOCl solution Exposure: Micromolar substrates; concentration-dependent chlorination assays Route: In vitro reagent addition Duration: Rapid kinetic measurements at 25 degrees C; pH 7.0 and pH 5.0 Limits: MPO substrates can stimulate or inhibit chlorination depending on conditions; not a universal MPO inhibitor. Primary reference: Mechanism of interaction of betanin and indicaxanthin with human myeloperoxidase and hypochlorous acid. (2005). https://pubmed.ncbi.nlm.nih.gov/15913556/ DOI: 10.1016/j.bbrc.2005.05.031
    Complete structured claim and evidence

  2. Indicaxanthin stimulated or inhibited MPO chlorination at neutral pH depending on concentration; at pH 5 only inhibition was observed.

    Indicaxanthin → Human myeloperoxidase / MPO source_derived_draftungraded
    Experimental context and source evidence
    dose
    Micromolar substrates; concentration-dependent chlorination assays
    duration
    Rapid kinetic measurements at 25 degrees C; pH 7.0 and pH 5.0
    evidence_access
    Primary PubMed abstract; detailed exposure for PMID 23931157 additionally checked in publisher results. No uninspected full text is claimed.
    evidence_scope
    literature_reviewed; source-derived curation, not universally established human effects
    experimental_model
    Purified human myeloperoxidase; cell-free chemistry
    limitations
    MPO substrates can stimulate or inhibit chlorination depending on conditions; not a universal MPO inhibitor.
    nutrient_topic
    Betalains collection; each molecular form, species, exposure and preparation remains explicit. · Betalains
    organism
    Purified human myeloperoxidase; cell-free chemistry
    plain_language
    Indicaxanthin stimulated or inhibited MPO chlorination at neutral pH depending on concentration; at pH 5 only inhibition was observed.
    primary_references
    Mechanism of interaction of betanin and indicaxanthin with human myeloperoxidase and hypochlorous acid. (2005). https://pubmed.ncbi.nlm.nih.gov/15913556/ DOI: 10.1016/j.bbrc.2005.05.031
    route
    In vitro reagent addition
    tissue
    MPO redox cycle and HOCl solution

    Betalains: mechanisms, molecular forms and cross-actor connections (2026-09-20) · lines 177–185

    Original AI-assisted curation of twelve primary research papers; study-specific PubMed/DOI links and limitations retained. Not publisher full text. · supports · Purified human myeloperoxidase; cell-free chemistry · source_derived_draft · unverified_draft

    ## betalains-indicaxanthin-chlorination Indicaxanthin stimulated or inhibited MPO chlorination at neutral pH depending on concentration; at pH 5 only inhibition was observed. Model/species: Purified human myeloperoxidase; cell-free chemistry Tissue: MPO redox cycle and HOCl solution Exposure: Micromolar substrates; concentration-dependent chlorination assays Route: In vitro reagent addition Duration: Rapid kinetic measurements at 25 degrees C; pH 7.0 and pH 5.0 Limits: MPO substrates can stimulate or inhibit chlorination depending on conditions; not a universal MPO inhibitor. Primary reference: Mechanism of interaction of betanin and indicaxanthin with human myeloperoxidase and hypochlorous acid. (2005). https://pubmed.ncbi.nlm.nih.gov/15913556/ DOI: 10.1016/j.bbrc.2005.05.031
    Complete structured claim and evidence

Where it participates (unsigned role)

  1. Ascorbic acid and glutathione reduced DNA-adduct formation during in-vitro peroxidase activation of eugenol by about 66% and 90%, respectively.

    L-Ascorbic acid → DNA adducts from peroxidase-activated eugenol source_derived_draftungraded
    Experimental context and source evidence
    dose
    Eugenol with peroxidase/hydrogen peroxide plus ascorbate or glutathione
    duration
    Acute
    evidence_access
    Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.
    evidence_scope
    literature_reviewed; model-specific source-derived curation
    experimental_model
    Cell-free peroxidase systems and human HL-60 cells
    limitations
    Cell-free protection does not prove that vitamin supplementation prevents toxicity in exposed humans.
    nutrient_topic
    Eugenol chapter; interacting nutrients, drugs, peptides and proteins retain their experimental settings. · Eugenol
    organism
    Cell-free peroxidase systems and human HL-60 cells
    plain_language
    Ascorbic acid and glutathione reduced DNA-adduct formation during in-vitro peroxidase activation of eugenol by about 66% and 90%, respectively.
    primary_references
    Oxidation of eugenol to form DNA adducts and 8-hydroxy-2'-deoxyguanosine: role of quinone methide derivative in DNA adduct formation. (1998). https://pubmed.ncbi.nlm.nih.gov/9525278/ DOI: 10.1093/carcin/19.3.437
    route
    In vitro
    tissue
    DNA adducts and oxidative base damage

    Eugenol: mechanism of action and interactions (2026-09-20) · lines 121–130

    Original AI-assisted source-specific curation with primary-study citations, model, exposure, route, duration, negative findings and limitations preserved. Not publisher full text. · supports · Cell-free peroxidase systems and human HL-60 cells · source_derived_draft · unverified_draft

    ## eugenol-ascorbate-gsh-adduct-protection Ascorbic acid and glutathione reduced DNA-adduct formation during in-vitro peroxidase activation of eugenol by about 66% and 90%, respectively. Model/species: Cell-free peroxidase systems and human HL-60 cells Tissue/system: DNA adducts and oxidative base damage Exposure: Eugenol with peroxidase/hydrogen peroxide plus ascorbate or glutathione Route: In vitro Duration: Acute Limits: Cell-free protection does not prove that vitamin supplementation prevents toxicity in exposed humans. Primary reference: Oxidation of eugenol to form DNA adducts and 8-hydroxy-2'-deoxyguanosine: role of quinone methide derivative in DNA adduct formation. (1998). https://pubmed.ncbi.nlm.nih.gov/9525278/ DOI: 10.1093/carcin/19.3.437 Access: Primary PubMed abstract and indexed metadata reviewed. Full-text method details not stated here remain unresolved.
    Complete structured claim and evidence

  2. Myeloperoxidase favored thiocyanate kinetically and generated hypothiocyanite despite 100 mM chloride.

    Thiocyanate ion → Chloride ion source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/chloride-research/9359420.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "83dc6a264dfb45201104568ac58c76509aaa0fabca1f32efd25861146b4b38c0", "start_char": 0, "end_char": 1700, "text_sha256": "83dc6a264dfb45201104568ac58c76509aaa0fabca1f32efd25861146b4b38c0"}
    experimental_model
    Purified-enzyme substrate kinetics
    exposure
    100 mM chloride with varying thiocyanate
    limitations
    Product chemistry under assay conditions; not a recommendation to raise chloride or thiocyanate intake.
    nutrient_topic
    Chloride research collection; topical membership is not evidence of a direct dietary effect. · Chloride
    organism
    Human neutrophil enzyme
    plain_language
    An abundant chloride pool does not mean it is the enzyme’s only substrate.
    primary_references
    [chloride-p9359420] Thiocyanate and chloride as competing substrates for myeloperoxidase. (1997). https://pubmed.ncbi.nlm.nih.gov/9359420/ DOI: 10.1042/bj3270487
    tissue_or_cell_type
    Myeloperoxidase reaction mixture

    Chloride: transport, acid-base balance, nutrient interactions and loss states (2026-09-17) · lines 627–638

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Purified-enzyme substrate kinetics · source_derived_draft · unverified_draft

    ### chloride-mpo-thiocyanate Myeloperoxidase favored thiocyanate kinetically and generated hypothiocyanite despite 100 mM chloride. Condition category: normal nutrient_topic: Chloride research collection; topical membership is not evidence of a direct dietary effect. plain_language: An abundant chloride pool does not mean it is the enzyme’s only substrate. organism: Human neutrophil enzyme tissue_or_cell_type: Myeloperoxidase reaction mixture experimental_model: Purified-enzyme substrate kinetics limitations: Product chemistry under assay conditions; not a recommendation to raise chloride or thiocyanate intake. exposure: 100 mM chloride with varying thiocyanate evidence_span: {"source_cache": "artifacts/chloride-research/9359420.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "83dc6a264dfb45201104568ac58c76509aaa0fabca1f32efd25861146b4b38c0", "start_char": 0, "end_char": 1700, "text_sha256": "83dc6a264dfb45201104568ac58c76509aaa0fabca1f32efd25861146b4b38c0"} [chloride-p9359420] Thiocyanate and chloride as competing substrates for myeloperoxidase. (1997). https://pubmed.ncbi.nlm.nih.gov/9359420/ DOI: 10.1042/bj3270487
    Complete structured claim and evidence

  3. Betanin donated one electron to MPO compound I, producing compound II.

    Betanin → Human myeloperoxidase compound I source_derived_draftungraded
    Experimental context and source evidence
    dose
    Micromolar substrates; concentration-dependent chlorination assays
    duration
    Rapid kinetic measurements at 25 degrees C; pH 7.0 and pH 5.0
    evidence_access
    Primary PubMed abstract; detailed exposure for PMID 23931157 additionally checked in publisher results. No uninspected full text is claimed.
    evidence_scope
    literature_reviewed; source-derived curation, not universally established human effects
    experimental_model
    Purified human myeloperoxidase; cell-free chemistry
    limitations
    MPO substrates can stimulate or inhibit chlorination depending on conditions; not a universal MPO inhibitor. Negative direction denotes consumption of compound I, not overall inhibition of MPO.
    nutrient_topic
    Betalains collection; each molecular form, species, exposure and preparation remains explicit. · Betalains
    organism
    Purified human myeloperoxidase; cell-free chemistry
    plain_language
    Betanin donated one electron to MPO compound I, producing compound II.
    primary_references
    Mechanism of interaction of betanin and indicaxanthin with human myeloperoxidase and hypochlorous acid. (2005). https://pubmed.ncbi.nlm.nih.gov/15913556/ DOI: 10.1016/j.bbrc.2005.05.031
    route
    In vitro reagent addition
    tissue
    MPO redox cycle and HOCl solution

    Betalains: mechanisms, molecular forms and cross-actor connections (2026-09-20) · lines 107–115

    Original AI-assisted curation of twelve primary research papers; study-specific PubMed/DOI links and limitations retained. Not publisher full text. · supports · Purified human myeloperoxidase; cell-free chemistry · source_derived_draft · unverified_draft

    ## betalains-betanin-mpo-i Betanin donated one electron to MPO compound I, producing compound II. Model/species: Purified human myeloperoxidase; cell-free chemistry Tissue: MPO redox cycle and HOCl solution Exposure: Micromolar substrates; concentration-dependent chlorination assays Route: In vitro reagent addition Duration: Rapid kinetic measurements at 25 degrees C; pH 7.0 and pH 5.0 Limits: MPO substrates can stimulate or inhibit chlorination depending on conditions; not a universal MPO inhibitor. Negative direction denotes consumption of compound I, not overall inhibition of MPO. Primary reference: Mechanism of interaction of betanin and indicaxanthin with human myeloperoxidase and hypochlorous acid. (2005). https://pubmed.ncbi.nlm.nih.gov/15913556/ DOI: 10.1016/j.bbrc.2005.05.031
    Complete structured claim and evidence

  4. Betanin reduced MPO compound II to the native ferric enzyme.

    Betanin → Human myeloperoxidase compound II source_derived_draftungraded
    Experimental context and source evidence
    dose
    Micromolar substrates; concentration-dependent chlorination assays
    duration
    Rapid kinetic measurements at 25 degrees C; pH 7.0 and pH 5.0
    evidence_access
    Primary PubMed abstract; detailed exposure for PMID 23931157 additionally checked in publisher results. No uninspected full text is claimed.
    evidence_scope
    literature_reviewed; source-derived curation, not universally established human effects
    experimental_model
    Purified human myeloperoxidase; cell-free chemistry
    limitations
    MPO substrates can stimulate or inhibit chlorination depending on conditions; not a universal MPO inhibitor. Negative direction denotes consumption of compound II; this step can restore chlorination activity.
    nutrient_topic
    Betalains collection; each molecular form, species, exposure and preparation remains explicit. · Betalains
    organism
    Purified human myeloperoxidase; cell-free chemistry
    plain_language
    Betanin reduced MPO compound II to the native ferric enzyme.
    primary_references
    Mechanism of interaction of betanin and indicaxanthin with human myeloperoxidase and hypochlorous acid. (2005). https://pubmed.ncbi.nlm.nih.gov/15913556/ DOI: 10.1016/j.bbrc.2005.05.031
    route
    In vitro reagent addition
    tissue
    MPO redox cycle and HOCl solution

    Betalains: mechanisms, molecular forms and cross-actor connections (2026-09-20) · lines 117–125

    Original AI-assisted curation of twelve primary research papers; study-specific PubMed/DOI links and limitations retained. Not publisher full text. · supports · Purified human myeloperoxidase; cell-free chemistry · source_derived_draft · unverified_draft

    ## betalains-betanin-mpo-ii Betanin reduced MPO compound II to the native ferric enzyme. Model/species: Purified human myeloperoxidase; cell-free chemistry Tissue: MPO redox cycle and HOCl solution Exposure: Micromolar substrates; concentration-dependent chlorination assays Route: In vitro reagent addition Duration: Rapid kinetic measurements at 25 degrees C; pH 7.0 and pH 5.0 Limits: MPO substrates can stimulate or inhibit chlorination depending on conditions; not a universal MPO inhibitor. Negative direction denotes consumption of compound II; this step can restore chlorination activity. Primary reference: Mechanism of interaction of betanin and indicaxanthin with human myeloperoxidase and hypochlorous acid. (2005). https://pubmed.ncbi.nlm.nih.gov/15913556/ DOI: 10.1016/j.bbrc.2005.05.031
    Complete structured claim and evidence

  5. Indicaxanthin donated one electron to MPO compound I, producing compound II.

    Indicaxanthin → Human myeloperoxidase compound I source_derived_draftungraded
    Experimental context and source evidence
    dose
    Micromolar substrates; concentration-dependent chlorination assays
    duration
    Rapid kinetic measurements at 25 degrees C; pH 7.0 and pH 5.0
    evidence_access
    Primary PubMed abstract; detailed exposure for PMID 23931157 additionally checked in publisher results. No uninspected full text is claimed.
    evidence_scope
    literature_reviewed; source-derived curation, not universally established human effects
    experimental_model
    Purified human myeloperoxidase; cell-free chemistry
    limitations
    MPO substrates can stimulate or inhibit chlorination depending on conditions; not a universal MPO inhibitor. Negative direction denotes consumption of compound I, not overall inhibition of MPO.
    nutrient_topic
    Betalains collection; each molecular form, species, exposure and preparation remains explicit. · Betalains
    organism
    Purified human myeloperoxidase; cell-free chemistry
    plain_language
    Indicaxanthin donated one electron to MPO compound I, producing compound II.
    primary_references
    Mechanism of interaction of betanin and indicaxanthin with human myeloperoxidase and hypochlorous acid. (2005). https://pubmed.ncbi.nlm.nih.gov/15913556/ DOI: 10.1016/j.bbrc.2005.05.031
    route
    In vitro reagent addition
    tissue
    MPO redox cycle and HOCl solution

    Betalains: mechanisms, molecular forms and cross-actor connections (2026-09-20) · lines 147–155

    Original AI-assisted curation of twelve primary research papers; study-specific PubMed/DOI links and limitations retained. Not publisher full text. · supports · Purified human myeloperoxidase; cell-free chemistry · source_derived_draft · unverified_draft

    ## betalains-indicaxanthin-mpo-i Indicaxanthin donated one electron to MPO compound I, producing compound II. Model/species: Purified human myeloperoxidase; cell-free chemistry Tissue: MPO redox cycle and HOCl solution Exposure: Micromolar substrates; concentration-dependent chlorination assays Route: In vitro reagent addition Duration: Rapid kinetic measurements at 25 degrees C; pH 7.0 and pH 5.0 Limits: MPO substrates can stimulate or inhibit chlorination depending on conditions; not a universal MPO inhibitor. Negative direction denotes consumption of compound I, not overall inhibition of MPO. Primary reference: Mechanism of interaction of betanin and indicaxanthin with human myeloperoxidase and hypochlorous acid. (2005). https://pubmed.ncbi.nlm.nih.gov/15913556/ DOI: 10.1016/j.bbrc.2005.05.031
    Complete structured claim and evidence

  6. Indicaxanthin reduced MPO compound II to the native ferric enzyme.

    Indicaxanthin → Human myeloperoxidase compound II source_derived_draftungraded
    Experimental context and source evidence
    dose
    Micromolar substrates; concentration-dependent chlorination assays
    duration
    Rapid kinetic measurements at 25 degrees C; pH 7.0 and pH 5.0
    evidence_access
    Primary PubMed abstract; detailed exposure for PMID 23931157 additionally checked in publisher results. No uninspected full text is claimed.
    evidence_scope
    literature_reviewed; source-derived curation, not universally established human effects
    experimental_model
    Purified human myeloperoxidase; cell-free chemistry
    limitations
    MPO substrates can stimulate or inhibit chlorination depending on conditions; not a universal MPO inhibitor. Negative direction denotes consumption of compound II; this step can restore chlorination activity.
    nutrient_topic
    Betalains collection; each molecular form, species, exposure and preparation remains explicit. · Betalains
    organism
    Purified human myeloperoxidase; cell-free chemistry
    plain_language
    Indicaxanthin reduced MPO compound II to the native ferric enzyme.
    primary_references
    Mechanism of interaction of betanin and indicaxanthin with human myeloperoxidase and hypochlorous acid. (2005). https://pubmed.ncbi.nlm.nih.gov/15913556/ DOI: 10.1016/j.bbrc.2005.05.031
    route
    In vitro reagent addition
    tissue
    MPO redox cycle and HOCl solution

    Betalains: mechanisms, molecular forms and cross-actor connections (2026-09-20) · lines 157–165

    Original AI-assisted curation of twelve primary research papers; study-specific PubMed/DOI links and limitations retained. Not publisher full text. · supports · Purified human myeloperoxidase; cell-free chemistry · source_derived_draft · unverified_draft

    ## betalains-indicaxanthin-mpo-ii Indicaxanthin reduced MPO compound II to the native ferric enzyme. Model/species: Purified human myeloperoxidase; cell-free chemistry Tissue: MPO redox cycle and HOCl solution Exposure: Micromolar substrates; concentration-dependent chlorination assays Route: In vitro reagent addition Duration: Rapid kinetic measurements at 25 degrees C; pH 7.0 and pH 5.0 Limits: MPO substrates can stimulate or inhibit chlorination depending on conditions; not a universal MPO inhibitor. Negative direction denotes consumption of compound II; this step can restore chlorination activity. Primary reference: Mechanism of interaction of betanin and indicaxanthin with human myeloperoxidase and hypochlorous acid. (2005). https://pubmed.ncbi.nlm.nih.gov/15913556/ DOI: 10.1016/j.bbrc.2005.05.031
    Complete structured claim and evidence

  7. Betanin reduced lipid hydroperoxide formation during MPO/nitrite-mediated oxidation of human LDL.

    Betanin → Lipid peroxidation source_derived_draftungraded
    Experimental context and source evidence
    dose
    Experimental betanin addition; concentration not specified in accessed abstract
    duration
    Oxidation time courses; duration not specified in accessed abstract
    evidence_access
    Primary PubMed abstract; detailed exposure for PMID 23931157 additionally checked in publisher results. No uninspected full text is claimed.
    evidence_scope
    literature_reviewed; source-derived curation, not universally established human effects
    experimental_model
    Isolated human LDL and MPO/nitrite biochemical system
    limitations
    Oxidation products were not chemically identified; clinical LDL lowering was not tested.
    nutrient_topic
    Betalains collection; each molecular form, species, exposure and preparation remains explicit. · Betalains
    organism
    Isolated human LDL and MPO/nitrite biochemical system
    plain_language
    Betanin reduced lipid hydroperoxide formation during MPO/nitrite-mediated oxidation of human LDL.
    primary_references
    Betanin inhibits the myeloperoxidase/nitrite-induced oxidation of human low-density lipoproteins. (2007). https://pubmed.ncbi.nlm.nih.gov/17364963/ DOI: 10.1080/10715760601038783
    route
    In vitro addition
    tissue
    LDL lipid compartment

    Betalains: mechanisms, molecular forms and cross-actor connections (2026-09-20) · lines 187–195

    Original AI-assisted curation of twelve primary research papers; study-specific PubMed/DOI links and limitations retained. Not publisher full text. · supports · Isolated human LDL and MPO/nitrite biochemical system · source_derived_draft · unverified_draft

    ## betalains-mpo-ldl Betanin reduced lipid hydroperoxide formation during MPO/nitrite-mediated oxidation of human LDL. Model/species: Isolated human LDL and MPO/nitrite biochemical system Tissue: LDL lipid compartment Exposure: Experimental betanin addition; concentration not specified in accessed abstract Route: In vitro addition Duration: Oxidation time courses; duration not specified in accessed abstract Limits: Oxidation products were not chemically identified; clinical LDL lowering was not tested. Primary reference: Betanin inhibits the myeloperoxidase/nitrite-induced oxidation of human low-density lipoproteins. (2007). https://pubmed.ncbi.nlm.nih.gov/17364963/ DOI: 10.1080/10715760601038783
    Complete structured claim and evidence

  8. Unidentified products generated by MPO/nitrite oxidation of betanin also inhibited LDL oxidation in the assay.

    Unidentified betanin oxidation products in the MPO/nitrite assay → Lipid peroxidation source_derived_draftungraded
    Experimental context and source evidence
    dose
    Experimental betanin addition; concentration not specified in accessed abstract
    duration
    Oxidation time courses; duration not specified in accessed abstract
    evidence_access
    Primary PubMed abstract; detailed exposure for PMID 23931157 additionally checked in publisher results. No uninspected full text is claimed.
    evidence_scope
    literature_reviewed; source-derived curation, not universally established human effects
    experimental_model
    Isolated human LDL and MPO/nitrite biochemical system
    limitations
    Oxidation products were not chemically identified; clinical LDL lowering was not tested.
    nutrient_topic
    Betalains collection; each molecular form, species, exposure and preparation remains explicit. · Betalains
    organism
    Isolated human LDL and MPO/nitrite biochemical system
    plain_language
    Unidentified products generated by MPO/nitrite oxidation of betanin also inhibited LDL oxidation in the assay.
    primary_references
    Betanin inhibits the myeloperoxidase/nitrite-induced oxidation of human low-density lipoproteins. (2007). https://pubmed.ncbi.nlm.nih.gov/17364963/ DOI: 10.1080/10715760601038783
    route
    In vitro addition
    tissue
    LDL lipid compartment

    Betalains: mechanisms, molecular forms and cross-actor connections (2026-09-20) · lines 197–205

    Original AI-assisted curation of twelve primary research papers; study-specific PubMed/DOI links and limitations retained. Not publisher full text. · supports · Isolated human LDL and MPO/nitrite biochemical system · source_derived_draft · unverified_draft

    ## betalains-oxidation-products Unidentified products generated by MPO/nitrite oxidation of betanin also inhibited LDL oxidation in the assay. Model/species: Isolated human LDL and MPO/nitrite biochemical system Tissue: LDL lipid compartment Exposure: Experimental betanin addition; concentration not specified in accessed abstract Route: In vitro addition Duration: Oxidation time courses; duration not specified in accessed abstract Limits: Oxidation products were not chemically identified; clinical LDL lowering was not tested. Primary reference: Betanin inhibits the myeloperoxidase/nitrite-induced oxidation of human low-density lipoproteins. (2007). https://pubmed.ncbi.nlm.nih.gov/17364963/ DOI: 10.1080/10715760601038783
    Complete structured claim and evidence

In the sources

Preserved passages that mention this component, quoted exactly. Open one to read it in context.

    This is a research prototype built from draft material. It is not medical advice, and its statements still await verification against the original studies.

    Evidence, AI assistance and curation standards