{"id":"48be296c-2a59-5581-87cd-66307a3bb5aa","stable_key":"788beb7b-7928-5f89-83d4-5556abf3702c:fulvic-acid-iron-complex","predicate":"complexes","statement":"The tested fulvic fraction formed iron(III) complexes within 15 minutes.","claim_class":"mechanistic","status":"source_derived_draft","evidence_grade":"ungraded","direction":"context_dependent","is_public":true,"mechanism_event_id":"abd3a1f4-c0ff-5cce-8c0d-62569946a920","mechanism_event_label":"The organic fraction bound ferric iron.","subject":{"id":"f17fcce7-092b-5eb4-b93f-cef2c95f2f9d","slug":"iron-binding-fulvic-2008","display_name":"Fulvic fraction used in 2008 iron EXAFS study","entity_type_key":"chemical_species"},"object":{"id":"964be7ac-43bd-5f3e-8326-94f0590de67a","slug":"iron-iii","display_name":"Ferric iron","entity_type_key":"ion"},"evidence_count":1,"mechanism_event":{"id":"abd3a1f4-c0ff-5cce-8c0d-62569946a920","stable_key":"788beb7b-7928-5f89-83d4-5556abf3702c:fulvic-acid-iron-complex-event","event_type":"observed_relationship","label":"The organic fraction bound ferric iron.","description":"The tested fulvic fraction formed iron(III) complexes within 15 minutes.","status":"provisional","compartment":null,"participants":[{"entity":{"id":"f17fcce7-092b-5eb4-b93f-cef2c95f2f9d","slug":"iron-binding-fulvic-2008","display_name":"Fulvic fraction used in 2008 iron EXAFS study","entity_type_key":"chemical_species"},"role":"subject","stoichiometry":null,"state_label":"","sequence_order":0,"notes":""},{"entity":{"id":"964be7ac-43bd-5f3e-8326-94f0590de67a","slug":"iron-iii","display_name":"Ferric iron","entity_type_key":"ion"},"role":"target","stoichiometry":null,"state_label":"","sequence_order":1,"notes":""},{"entity":{"id":"0aa6c0fc-8374-56e0-b172-6c40b6366d21","slug":"fulvic-acid","display_name":"Fulvic acid (heterogeneous humic fraction)","entity_type_key":"chemical_species"},"role":"context_participant","stoichiometry":null,"state_label":"","sequence_order":2,"notes":""},{"entity":{"id":"89bcaf42-b4ab-5760-8c2e-44eace10cee0","slug":"iron","display_name":"Iron","entity_type_key":"nutrient_element"},"role":"context_participant","stoichiometry":null,"state_label":"","sequence_order":3,"notes":""}]},"contexts":[{"dimension":"evidence_access","value_text":"Primary abstract","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"experimental_model","value_text":"Cell-free EXAFS spectroscopy; acidic aqueous solutions at pH 2 and 4.","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"limitations","value_text":"Chemical binding does not establish human intestinal uptake or correction of iron deficiency.","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"nutrient_topic","value_text":"Fulvic acid collection; species, compartment, exposure, co-substrates and manipulation remain explicit.","comparator":null,"unit":null,"notes":"","entity":{"slug":"fulvic-acid","display_name":"Fulvic acid (heterogeneous humic fraction)","entity_type_key":"chemical_species"}},{"dimension":"plain_language","value_text":"The organic fraction bound ferric iron.","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"primary_references","value_text":"EXAFS study on the reactions between iron and fulvic acid in acid aqueous solutions. · 2008 · https://pubmed.ncbi.nlm.nih.gov/18504967/ · DOI 10.1021/es072092z","comparator":null,"unit":null,"notes":"","entity":null}],"evidence":[{"id":"0edec940-da7c-5b92-be3f-ce4c02247af7","evidence_kind":"source_excerpt","locator":"Lines 92-98","start_line":92,"end_line":98,"excerpt":"## fulvic-acid-iron-complex\nThe organic fraction bound ferric iron.\nThe tested fulvic fraction formed iron(III) complexes within 15 minutes.\nModel: Cell-free EXAFS spectroscopy; acidic aqueous solutions at pH 2 and 4.\nLimitations: Chemical binding does not establish human intestinal uptake or correction of iron deficiency.\nEvidence access: Primary abstract\nEXAFS study on the reactions between iron and fulvic acid in acid aqueous solutions. · 2008 · https://pubmed.ncbi.nlm.nih.gov/18504967/ · DOI 10.1021/es072092z","model_system":"Cell-free EXAFS spectroscopy; acidic aqueous solutions at pH 2 and 4.","directness":"reported_statement","verification_status":"source_derived_draft","notes":"Original curation paraphrase; evidence access and experimental limitations specified.","relationship":"supports","weight":1.0,"link_notes":"","source":{"id":"b00a1818-46e4-52cc-8dfe-a647d5c08ed7","stable_key":"import-788beb7b-7928-5f89-83d4-5556abf3702c","title":"Fulvic acid: mixture identity, mineral chemistry, signaling and cross-nutrient mechanisms (2026-09-19)","document_type":"imported_text","citation_label":"AI-assisted research curation; primary references, access levels and experimental limitations individually identified. 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