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 assigned to chemical dyes and colorants, but recent state and local solicitations tagged under this code reflect no purchasing activity aligned with the code's nominal scope. The four most recent opportunities posted under this code cover radiologic and X-ray equipment procurement, extended warranty services for medical imaging systems, X-ray system maintenance services, and copper sulfate chemicals—none of which relate to indigo carmine or indigotindisulfonate sodium. The mismatch between the code's chemical-dye classification and the actual work being procured suggests either systematic miscoding in the issuing jurisdictions' procurement systems or a fundamental disconnect between how this code is deployed in practice and its intended commodity definition.

The recent opportunities originate from Arizona (Maricopa County), Florida (Escambia County Correction, Broward County Aviation Department, Pasco County), and span county-level issuing bodies across health care, corrections, aviation, and water-management functions. Maricopa County issued an IFB (No. IFB362910) on October 1, 2026 for radiologic equipment and installation at three colleges with a response deadline of October 22, 2026; Escambia County Correction posted a sole-source procurement (No. SSCORALM2526005) on August 12, 2026 for an extended warranty on specific X-ray machines, due August 19, 2026; Broward County Aviation Department issued an RFI (No. BLD2132311F1) on June 25, 2026 with responses due July 28, 2026 to test sole-source designation for Rapiscan X-ray inspection system maintenance; and Pasco County posted an RFQ (No. RFQFP261004) on June 3, 2026 for as-needed supply of copper sulfate crystals and liquid copper sulfate, due June 26, 2026. The code shows no meaningful recent activity in its stated commodity area; pursuit decisions should focus on whether these miscoded opportunities align with your firm's actual service lines rather than on the UNSPSC classification itself.