UNSPSC 51442601: Indigo carmine or indigotindisulfonate sodium

This classification denotes a dye with the molecular formula C16H8N2O8S2.2Na, a preparation that US FDA recognizes as an active ingredient or moiety under Unique Ingredient Identifier D3741U8K7L, chemically known as 2-(1,3-dihydro-3-oxo-5-sulfo-2h-indol-2-ylidene)-2,3-dihydro-3-oxo-1h-indole-5-sulfonic acid, disodium salt but more generally known as acid blue 74, which bears US NIH Compound Identifier 5282429.

European Medicines Agency schedules Indigo carmine in its eXtended EudraVigilance Medicinal Product Dictionary or XEVMPD under Index SUB12518MIG World Health Organization schedules acid blue 74 in its Anatomical Therapeutic Chemical (ATC) Classification. Indigotindisulfonate sodium bears US NLM identifiers UMLS ID C0021219 and NCI Concept Code C83799. SMILES: S(=O)(=O)(O)C1CC2C(N/C(=C3/NC4C(C3=O)CC(S(=O)(=O)O)CC4)C2=O)CC1.[NA].[NA].

UNSPSC 51442601 Indigo carmine or indigotindisulfonate sodium is a Commodity code that shows minimal recent activity aligned with its nominal scope. The code's abstract definition—a specific chemical compound used in diagnostics and laboratory applications—does not match the recent state and local solicitations tagged under it. The two opportunities on record involve unrelated commodities: X-ray system maintenance services (Broward County Aviation Department) and copper sulfate chemicals (Pasco County), neither of which is indigo carmine or a close substitute. The mismatch suggests either a data-entry error in the source system or a misapplication of the code by the issuing bodies.

Pasco County, Florida posted an RFQ on June 3, 2026, for as-needed supply of large copper sulfate crystals and liquid copper sulfate, with responses due June 26, 2026, under an indefinite-quantity arrangement with one or more vendors. Broward County Aviation Department issued an RFI on June 25, 2026, with responses due July 28, 2026, to challenge or affirm a sole-source designation for Rapiscan X-ray inspection system maintenance services. Neither opportunity reflects genuine demand for indigo carmine or related diagnostic chemicals. Procurement activity under this code appears dormant for its actual commodity; if your firm supplies indigo carmine or indigotindisulfonate sodium to state or local laboratories, medical facilities, or testing centers, monitor state and local RFP and RFQ notices directly rather than rely on this code's recent history.