1,2-Naphthoquinone-4-sulfonic acid sodium salt

1,2-Naphthoquinone-4-sulfonic acid sodium salt (CAS 521-24-4) is a reactive quinone derivative commercially known as Folin's Reagent and Manchester Blue. It carries no assigned E-code and is classified under HS code 29147000. The compound is also catalogued under the reference identifier LABOTEST-BB LT00233183.

In pharmaceutical and biotechnology workflows, this compound functions as an analytical reagent for the colorimetric detection of primary amines and amino acids, reacting with free amine groups to produce measurable chromogenic complexes. It also serves a catalytic role in select biochemical assays where controlled oxidation chemistry is required to quantify specific analytes in biological matrices.

This material is supplied as a solid powder and is subject to REACH registration requirements applicable within the European Economic Area. Procurement teams should confirm lot-specific purity documentation and request safety data sheets aligned with current EU GHS classification standards before placing orders.