Eriochrome cyanine R indicator (C.I. 43820) CAS 3564-18-9

Description

Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including Eriochrome cyanine R indicator (C.I. 43820).

Eriochrome cyanine R indicator (C.I. 43820) (CAS 3564-18-9) is a high-purity analytical reference standard with the molecular formula C23H15Na3O9S and a molecular weight of 536.39 g/mol.

Owing to a flavonoid core, a sulfone group, a hydroxyl group, an ether linkage, Eriochrome cyanine R indicator (C.I. 43820) is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 536.39 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).

This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.

The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.

Physical & Chemical Properties

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