{"id":"57ab2191-72ce-554f-b3ce-a84417de3a73","stable_key":"35ec55a7-323c-5c28-979e-3bdafe9d5769:yeast-glucosidase-delphinidin","predicate":"decreases_in_recorded_experiment","statement":"delphinidin inhibited yeast alpha-glucosidase in the synthetic-substrate assay; IC50 approximately 4.11 uM.","claim_class":"observational","status":"source_derived_draft","evidence_grade":"ungraded","direction":"negative","is_public":true,"mechanism_event_id":"2c4a084f-d277-5369-ba22-772b5f792611","mechanism_event_label":"delphinidin inhibited yeast alpha-glucosidase in the synthetic-substrate assay; IC50 approximately 4.11 uM.","subject":{"id":"35f028a1-9a8b-5983-8d02-53c5fb091d38","slug":"delphinidin","display_name":"Delphinidin","entity_type_key":"small_molecule"},"object":{"id":"5a14cf90-37db-59d9-918f-0effcb510f9d","slug":"yeast-alpha-glucosidase","display_name":"Saccharomyces cerevisiae alpha-glucosidase assay enzyme","entity_type_key":"protein"},"evidence_count":1,"mechanism_event":{"id":"2c4a084f-d277-5369-ba22-772b5f792611","stable_key":"35ec55a7-323c-5c28-979e-3bdafe9d5769:yeast-glucosidase-delphinidin-event","event_type":"experimental_observation","label":"delphinidin inhibited yeast alpha-glucosidase in the synthetic-substrate assay; IC50 approximately 4.11 uM.","description":"**Enzyme identity changes the digestive-enzyme claim.** A purified-compound assay used yeast α-glucosidase and a synthetic substrate, not human sucrase-isomaltase. Delphinidin aglycone inhibited with an IC50 near 4.11 µM; cyanidin was about 17.01 µM. Delphinidin-3-glucoside was much weaker, around 364 µM, and its 3,5-diglucoside showed no detected inhibition in the tested range. These values establish structure-dependent assay behavior. They cannot be imported as human intestinal IC50 values or a clinical comparison with acarbose. Docking does not repair that species/substrate gap. [Promyos et al., 2020](https://pmc.ncbi.nlm.nih.gov/articles/PMC7541926/).","status":"provisional","compartment":null,"participants":[{"entity":{"id":"35f028a1-9a8b-5983-8d02-53c5fb091d38","slug":"delphinidin","display_name":"Delphinidin","entity_type_key":"small_molecule"},"role":"tested factor","stoichiometry":null,"state_label":"Purified delphinidin concentration series","sequence_order":0,"notes":""},{"entity":{"id":"5a14cf90-37db-59d9-918f-0effcb510f9d","slug":"yeast-alpha-glucosidase","display_name":"Saccharomyces cerevisiae alpha-glucosidase assay enzyme","entity_type_key":"protein"},"role":"measured outcome","stoichiometry":null,"state_label":"decrease","sequence_order":1,"notes":""}]},"contexts":[{"dimension":"evidence_access","value_text":"Full text retrieved; relevant methods/results/figure text reviewed. No independent raw-data verification.","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"experimental_contrast","value_text":"{\"intervention\": \"Purified delphinidin concentration series\", \"comparator\": \"Assay without inhibitor\", \"endpoint\": \"delphinidin inhibited yeast alpha-glucosidase in the synthetic-substrate assay; IC50 approximately 4.11 uM.\", \"effect_direction\": \"decrease\", \"combination\": \"single\", \"conditions\": []}","comparator":null,"unit":null,"notes":"Explicit extracted experimental comparison; source-derived draft.","entity":null},{"dimension":"experimental_model","value_text":"Saccharomyces cerevisiae alpha-glucosidase, pNPG substrate, pH 6, 37 C.","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"interpretation_status","value_text":"Source-derived extraction of a fact-checked reference; access is explicit, not independent raw-data verification.","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"limitations","value_text":"Yeast enzyme assay; not human sucrase-isomaltase or maltase. IC50 depends on substrate and conditions; docking is not a human-target validation.","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"plain_language","value_text":"delphinidin inhibited yeast alpha-glucosidase in the synthetic-substrate assay; IC50 approximately 4.11 uM.","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"primary_references","value_text":"Investigation of Anthocyanidins and Anthocyanins for Targeting α-Glucosidase in Diabetes Mellitus. | 2020 | DOI 10.3746/pnf.2020.25.3.263 | PMID 33083375 | https://pubmed.ncbi.nlm.nih.gov/33083375/ | https://pmc.ncbi.nlm.nih.gov/articles/PMC7541926/ | https://doi.org/10.3746/pnf.2020.25.3.263","comparator":null,"unit":null,"notes":"","entity":null},{"dimension":"source_locator","value_text":"Reviewed reference lines 80-80; exact primary location described in quoted passage where extracted.","comparator":null,"unit":null,"notes":"","entity":null}],"evidence":[{"id":"1967adea-f301-5b90-8a22-a60b6e9cc530","evidence_kind":"source_excerpt","locator":"Lines 80-80","start_line":80,"end_line":80,"excerpt":"**Enzyme identity changes the digestive-enzyme claim.** A purified-compound assay used yeast α-glucosidase and a synthetic substrate, not human sucrase-isomaltase. Delphinidin aglycone inhibited with an IC50 near 4.11 µM; cyanidin was about 17.01 µM. Delphinidin-3-glucoside was much weaker, around 364 µM, and its 3,5-diglucoside showed no detected inhibition in the tested range. These values establish structure-dependent assay behavior. They cannot be imported as human intestinal IC50 values or a clinical comparison with acarbose. Docking does not repair that species/substrate gap. [Promyos et al., 2020](https://pmc.ncbi.nlm.nih.gov/articles/PMC7541926/).","model_system":"Saccharomyces cerevisiae alpha-glucosidase, pNPG substrate, pH 6, 37 C.","directness":"reported_statement","verification_status":"source_derived_draft","notes":"Exact excerpt of the retained AI-assisted reviewed reference; primary sources are cited in primary_references and access scope is retained. Not a verbatim quotation from a primary paper.","relationship":"supports","weight":1.0,"link_notes":"","source":{"id":"b08e7f7d-4d34-56d7-a185-2124f8d72b3c","stable_key":"import-35ec55a7-323c-5c28-979e-3bdafe9d5769","title":"Anthocyanins: detailed mechanisms of action (reviewed 4 October 2026)","document_type":"imported_text","citation_label":"Original AI-assisted review of primary studies and, where relevant, official regulatory records. Access level is retained per claim. Corrections, null results and unresolved questions remain explicit. Not publisher full text or independent replication.","file_path":"","sha256":"7cff1a47fbd9c625412b84162b1c823004b4162b7c009f9a11d5807fb8e04ef9","revision_id":"1bd4fa42-bfeb-5148-8250-fc363d8c1de0","review_status":"unverified_draft","notes":""}}],"relations":[],"conflicts":[],"corrections":[],"research":null}