Ontology mapping
- Primary identifier
-
UNMAPPED_0248 - Ontology term
-
CHEBI:17029— chitin - Ontology label
- chitin
- Notes
- Imported from CultureBotHT (compounds_to_cas.csv (no CAS-RN)). No CAS-RN or CHEBI mapping available; curator review needed. Reviewed on 2026-05-11 as a shrimp-shell chitin substrate pending polymer source and processing curation.
Evidence (1)
LITERATURE
via Edison LITERATURE (PaperQA3) identity research
Parent class, not identity: the report calls it "a source-qualified polymer preparation, not a uniquely defined small molecule"; chitin is that source-free polymer.
Occurrence statistics
- Total occurrences
- 0
- Distinct media
- 0
Curation history
| Timestamp | Curator | Action | New status | Changes |
|---|---|---|---|---|
| 2026-04-29T06:51:33.117170+00:00 | audit_add_remaining_culturebotht | CREATED_AS_UNMAPPED | UNMAPPED | Imported from CultureBotHT (compounds_to_cas.csv (no CAS-RN)). No CAS-RN or CHEBI mapping available; curator review needed. |
| 2026-05-11T07:34:00Z | mediaingredientmech-agentic-curation LLM | CLASSIFIED_UNDEFINED_MIXTURE | UNMAPPED | Classified as a source-specific chitin substrate and left unmapped pending polymer source, processing, and exact ontology curation. |
| 2026-08-06T00:00:00+00:00 | edison_literature_identity LLM | ANNOTATED | Edison LITERATURE (PaperQA3) identity research; report at research/ingredients/Chitin_from_shrimp_shells-edison-literature.md (local artifact — research/ is gitignored, so the findings are quoted here rather than linked). Report verdict: **Recommended interpretation:** a source-qualified polymer preparation, not a uniquely defined small molecule and not necessarily a compositionally invariant substance. Chitin is a linear polysaccharide of β-(1→4)-linked N-acetyl-D-glucosamine residues. Chitin from crustaceans normally occurs as **α-chitin**, whose chains are antiparallel, but the label itself does not prove polymorph, purity, mol CURIEs discussed: CHEBI:17029, MESH:D002428. Recorded as provenance only — no grounding applied from this run. Edison's recommendations are deliberately conservative, and a plausible identifier promoted by a mechanism that never decided anything is what #203 and #263 exist to undo. Any CURIE above is a curator's to accept or reject. | |
| 2026-08-07T00:00:00+00:00 | edison_contextual_parent LLM | ADDED_PARENT_CONTEXT | Recorded CHEBI:17029 (chitin) as the nearest ontology parent with mapping_quality=NARROW_MATCH: the report calls it "a source-qualified polymer preparation, not a uniquely defined small molecule"; chitin is that source-free polymer. Status stays UNMAPPED and NO SSSOM row is published — this follows the existing contextual pattern on Inorganic salts-starch agar (CHEBI:24839, "retained ... only as contextual curation") and five sibling records. exactMatch/closeMatch are withheld deliberately: they license node substitution, and a source- or grade-qualified preparation is not interchangeable with the substance it is prepared from. Whether this pattern should instead publish a skos:narrowMatch row is the open question in #294. |