{"id":"503ed311-7103-57d3-9687-6be2bc2cb6ee","stable_key":"cab605fe-8a82-5191-9966-d19a9628c24c:betalains-betanin-chlorination","predicate":"modulates_chlorination","statement":"Betanin stimulated or inhibited MPO chlorination at neutral pH depending on concentration; at pH 5 only inhibition was observed.","claim_class":"mechanistic","status":"source_derived_draft","evidence_grade":"ungraded","direction":"context_dependent","is_public":true,"mechanism_event_id":"be45b041-ef78-5b27-af2d-4b3df5a1074a","mechanism_event_label":"Betanin stimulated or inhibited MPO chlorination at neutral pH depending on concentration; at pH 5 only inhibition was observed.","subject":{"id":"6c12bb61-c9c2-5c6d-a087-a292145ccaf0","slug":"betanin","display_name":"Betanin","entity_type_key":"small_molecule"},"object":{"id":"53f51828-4ea1-5f2e-a044-e02577272436","slug":"mpo","display_name":"Human myeloperoxidase / MPO","entity_type_key":"protein"},"evidence_count":1,"mechanism_event":{"id":"be45b041-ef78-5b27-af2d-4b3df5a1074a","stable_key":"cab605fe-8a82-5191-9966-d19a9628c24c:betalains-betanin-chlorination-event","event_type":"observed_relationship","label":"Betanin stimulated or inhibited MPO chlorination at neutral pH depending on concentration; at pH 5 only inhibition was observed.","description":"Betanin stimulated or inhibited MPO chlorination at neutral pH depending on concentration; at pH 5 only inhibition was observed.","status":"provisional","compartment":null,"participants":[{"entity":{"id":"6c12bb61-c9c2-5c6d-a087-a292145ccaf0","slug":"betanin","display_name":"Betanin","entity_type_key":"small_molecule"},"role":"subject","stoichiometry":null,"state_label":"","sequence_order":0,"notes":""},{"entity":{"id":"53f51828-4ea1-5f2e-a044-e02577272436","slug":"mpo","display_name":"Human myeloperoxidase / MPO","entity_type_key":"protein"},"role":"target","stoichiometry":null,"state_label":"","sequence_order":1,"notes":""},{"entity":{"id":"6f35aa38-f875-5759-b749-97a2f6480ff3","slug":"chloride-ion","display_name":"Chloride ion","entity_type_key":"ion"},"role":"context_participant","stoichiometry":null,"state_label":"","sequence_order":2,"notes":""},{"entity":{"id":"da9d64bc-69d4-5d97-90a4-8f0ed03e0ac8","slug":"hydrogen-peroxide","display_name":"Hydrogen peroxide","entity_type_key":"small_molecule"},"role":"context_participant","stoichiometry":null,"state_label":"","sequence_order":3,"notes":""},{"entity":{"id":"9bb71c3b-47d9-52bd-93ec-f2b06b3355a3","slug":"hypochlorous-acid","display_name":"Hypochlorous acid / HOCl","entity_type_key":"chemical_species"},"role":"context_participant","stoichiometry":null,"state_label":"","sequence_order":4,"notes":""}]},"contexts":[{"dimension":"dose","value_text":"Micromolar substrates; concentration-dependent chlorination assays","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"duration","value_text":"Rapid kinetic measurements at 25 degrees C; pH 7.0 and pH 5.0","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"evidence_access","value_text":"Primary PubMed abstract; detailed exposure for PMID 23931157 additionally checked in publisher results. No uninspected full text is claimed.","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"evidence_scope","value_text":"literature_reviewed; source-derived curation, not universally established human effects","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"experimental_model","value_text":"Purified human myeloperoxidase; cell-free chemistry","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"limitations","value_text":"MPO substrates can stimulate or inhibit chlorination depending on conditions; not a universal MPO inhibitor.","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"nutrient_topic","value_text":"Betalains collection; each molecular form, species, exposure and preparation remains explicit.","comparator":null,"unit":null,"notes":"","entity":{"slug":"betalains","display_name":"Betalains","entity_type_key":"small_molecule"}},{"dimension":"organism","value_text":"Purified human myeloperoxidase; cell-free chemistry","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"plain_language","value_text":"Betanin stimulated or inhibited MPO chlorination at neutral pH depending on concentration; at pH 5 only inhibition was observed.","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"primary_references","value_text":"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","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"route","value_text":"In vitro reagent addition","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"tissue","value_text":"MPO redox cycle and HOCl solution","comparator":null,"unit":null,"notes":"","entity":null}],"evidence":[{"id":"61dacef7-8d58-5664-9ffc-f03420fc9c57","evidence_kind":"source_excerpt","locator":"Lines 137-145","start_line":137,"end_line":145,"excerpt":"## betalains-betanin-chlorination\nBetanin stimulated or inhibited MPO chlorination at neutral pH depending on concentration; at pH 5 only inhibition was observed.\nModel/species: Purified human myeloperoxidase; cell-free chemistry\nTissue: MPO redox cycle and HOCl solution\nExposure: Micromolar substrates; concentration-dependent chlorination assays\nRoute: In vitro reagent addition\nDuration: Rapid kinetic measurements at 25 degrees C; pH 7.0 and pH 5.0\nLimits: MPO substrates can stimulate or inhibit chlorination depending on conditions; not a universal MPO inhibitor.\nPrimary 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","model_system":"Purified human myeloperoxidase; cell-free chemistry","directness":"reported_statement","verification_status":"source_derived_draft","notes":"Exact archived curation span; an original paraphrase with an individually identified primary reference.","relationship":"supports","weight":1.0,"link_notes":"","source":{"id":"be94d093-444c-5729-8831-bc33b0ef2fd7","stable_key":"import-cab605fe-8a82-5191-9966-d19a9628c24c","title":"Betalains: mechanisms, molecular forms and cross-actor connections (2026-09-20)","document_type":"imported_text","citation_label":"Original AI-assisted curation of twelve primary research papers; study-specific PubMed/DOI links and limitations retained. 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