Hydroxynaphthol blue

Also known as: HNB, Hydroxynaphthol blue trisodium salt, Trisodium 3-hydroxy-4-[(E)-(2-hydroxy-4-sulfonato-1-naphthyl)diazenyl]-2,7-naphthalenedisulfonate, Trisodium 3-hydroxy-4-((2-hydroxy-4-sulphonato-1-naphthyl)azo)naphthalene-2,7-disulphonate, 2,7-Naphthalenedisulfonic acid, 3-hydroxy-4-[(2-hydroxy-4-sulfo-1-naphthalenyl)azo]-, trisodium salt, 3-Hydroxy-4-(2-hydroxy-4-sulfo-1-naphthylazo)naphthalene-2,7-disulfonic acid trisodium salt, CALVER(R) 2 CALCIUM INDICATOR, MFCD00036393

Hydroxynaphthol blue (CAS 63451-35-4) is a compound in the Alcohols category listed in the Jingsj chemical database. It has the molecular formula C20H11N2Na3O11S3 and a molecular weight of 620.47 g/mol. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 63451-35-4
Jingsj CID: J-47808-7
Molecular Formula: C₂₀H₁₁N₂Na₃O₁₁S₃
Molecular Weight: 620.47 g/mol
Category: Alcohols
Last updated: 8/21/2026

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Physicochemical Properties

Exact Mass	619.921814
PSA	261.92000
LogP	5.77430

Activity & Biological Data

Additional Information	[1]. Yang Q, et al. Closed-tube saltatory rolling circle amplification with hydroxynaphthol blue for visual on-site detection of peanut as an allergenic food. Food Chem. 2022 Nov 1;393:133408.

Frequently Asked Questions

What is the CAS number of Hydroxynaphthol blue?

The CAS number of Hydroxynaphthol blue is 63451-35-4.

What are the molecular formula and molecular weight of Hydroxynaphthol blue?

Hydroxynaphthol blue has molecular formula C20H11N2Na3O11S3 and molecular weight 620.47 g/mol.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "Hydroxynaphthol blue (CAS 63451-35-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-47808-7 (accessed 2026-11-06).

Data for reference only; verify product details with suppliers before purchase.