Toluidine red

Name: Toluidine red
Brand: Vaqora Chemicals
SKU: VQ-039546

About Toluidine red

Toluidine red (CAS 2425-85-6) is a high-purity reference standard of Fludarabine offered by Vaqora Chemicals. Its molecular formula is C17H13N3O3 and its molecular weight is 307.3 g/mol. Systematically, it is named 1-[(4-methyl-2-nitrophenyl)diazenyl]naphthalen-2-ol. Alternative names: Hansa Red B and Helio Red Toner.

The product is provided as a solid. Keep the vial tightly closed, protected from light and humidity, at the temperature stated on the Certificate of Analysis. Under GHS it is labelled “Danger”, so handle it with suitable PPE and consult the SDS.

Laboratories use this Fludarabine standard for identity and assay testing, system suitability checks and method validation supporting ANDA and DMF filings. Our customers for this product work in pharmaceutical manufacturing and academic and industrial research.

Standard pack sizes are 10 mg, 25 mg, 50 mg and 100 mg, and every batch ships with a Certificate of Analysis (COA) and we export worldwide.

Typical applications

Identification & assay
Method development & validation
QC reference material

Industries

Related to Fludarabine

View every impurity, metabolite and intermediate we list for Fludarabine.

Fludarabine impurities

Specifications & identifiers

Chemical identifiers
Product name	Toluidine red
Catalogue No.	VQ-039546
CAS Number	2425-85-6
IUPAC name	1-[(4-methyl-2-nitrophenyl)diazenyl]naphthalen-2-ol
Molecular formula	C₁₇H₁₃N₃O₃
Molecular weight	307.3 g/mol
Exact mass	307.0957
Grade	Reference Standard
HSN code	38229090
InChIKey	ZLFVRXUOSPRRKQ-UHFFFAOYSA-N
SMILES	CC1=CC(=C(C=C1)N=NC2=C(C=CC3=CC=CC=C32)O)[N+](=O)[O-]
PubChem CID	17047

Physical properties
Physical form	Solid
LogP (XLogP3)	4.8
H-bond donors / acceptors	1 / 5
TPSA	90.8 Å²
Synonyms	Hansa Red B, Helio Red Toner, Siegle Red BB, Permanent Red 4R, Toluidine Red 3B, Fast Red R, Toluidine Toner, Independence Red, Helio Fast Red RN, Chromatex Red J, Toluidine Red R, Deep Fastona Red

Safety & hazard information (GHS)

Corrosive

Environmental hazard

Signal word: Danger

Hazard statements

H318Causes serious eye damage
H410Very toxic to aquatic life with long lasting effects
H413May cause long lasting harmful effects to aquatic life

Precautionary statements: P264 + P265, P273, P280, P305 + P354 + P338, P317, P391, P501

Classification is indicative (aggregated GHS notifications) and may vary by grade and concentration. Always refer to the SDS supplied with your lot.

Documents

Safety Data Sheet (SDS)16-section GHS · on request Certificate of AnalysisTypical / batch COA · on request Specification sheetTDS / MOA · on request

Frequently asked questions

What is the CAS number of Toluidine red?

The CAS Registry Number of Toluidine red is 2425-85-6. It is also known as Hansa Red B, Helio Red Toner, Siegle Red BB.

What is the molecular formula and molecular weight of Toluidine red?

Toluidine red has the molecular formula C17H13N3O3 and a molecular weight of 307.3 g/mol. Its IUPAC name is 1-[(4-methyl-2-nitrophenyl)diazenyl]naphthalen-2-ol.

What is Toluidine red used for?

Toluidine red is supplied as a characterised reference material related to Fludarabine. It is used for analytical method development and validation (AMV), impurity profiling, stability studies and quality control, and in ANDA/DMF regulatory filings.

Which grade and pack sizes of Toluidine red can I order?

We supply Toluidine red in Reference Standard grade, in 10 mg, 25 mg, 50 mg, 100 mg packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Toluidine red?

Yes. Every lot of Toluidine red is shipped with a batch-specific Certificate of Analysis, and a 16-section GHS Safety Data Sheet is provided with the quotation and the shipment.

Can Toluidine red be shipped internationally?

Yes. Toluidine red is classified as hazardous, so it is packed in UN-approved packaging and shipped as dangerous goods under IATA/IMDG rules. We export worldwide on EXW, FOB, CIF and DAP terms.