Acid Red 66 - Dye content ~60 % , CAS No.4196-99-0

CAS: 4196-99-0 Cat. No.: A121933 Molecular Weight: 556.48 EC Number: 224-084-5
AVAILABLE TO ORDER
GRADE & PURITY Dye content ~60 %
Synonyms
Biebrich scarlet sodium salt | Biebrich scarlet WS | Ponceau BS
Storage
Room temperature
Shipped In
Normal
 ·  off list, applied to all prices below.
Size
Status
Price
Qty
25g
A121933-25g
5
$55.90
100g
A121933-100g
4
$144.90
Enter a quantity for the sizes you want to add.
🧪

Why this grade

Dye content ~60 % for sensitive chromatographic and analytical workflows requiring minimal baseline interference.

🌡

Storage & shipping

Room temperature Ships Normal Check lot-specific COA for exact specifications.

📋

Quality documents

SDS, COA, datasheet, and spec sheet available for download. Lot-specific COA accessible via lot number lookup.

📚

Literature proof

Cited in 12 peer-reviewed publications across chromatography, organic synthesis, and cross-coupling reactions.

Specifications

Synonyms
Biebrich scarlet sodium salt | Biebrich scarlet WS | Ponceau BS
Specifications & Purity
Dye content ~60 %
Biochemical and Physiological Mechanisms
Azo organosulfur dye.Ponceau BS is used in Masson′s trichrome staining procedure, along with acid fuchsin, for the labeling of collagen and muscle red.
Storage
Room temperature
Shipped In
Normal
Note
Wherever possible, you should prepare and use solutions on the same day. However, if you need to make up stock solutions in advance, we recommend that you store the solution as aliquots in tightly sealed vials at -20°C. Generally, these will be useable for up to one month. Before use, and prior to opening the vial we recommend that you allow your product to equilibrate to room temperature for at least 1 hour. Need more advice on solubility, usage and handling? Please visit our frequently asked questions (FAQ) page for more details.
Names and Identifiers
Pubchem Sid488182594
Pubchem Sid Urlhttps://pubchem.ncbi.nlm.nih.gov/substance/488182594
Canonical SmilesC1=CC=C2C(=C1)C=CC(=C2N=NC3=C(C=C(C=C3)N=NC4=CC=C(C=C4)S(=O)(=O)[O-])S(=O)(=O)[O-])O.[Na+].[Na+]
IUPAC Namedisodium;2-[(2-hydroxynaphthalen-1-yl)diazenyl]-5-[(4-sulfonatophenyl)diazenyl]benzenesulfonate
InChIKeyVVAVKBBTPWYADW-UHFFFAOYSA-L
INCHI1S/C22H16N4O7S2.2Na/c27-20-12-5-14-3-1-2-4-18(14)22(20)26-25-19-11-8-16(13-21(19)35(31,32)33)24-23-15-6-9-17(10-7-15)34(28,29)30;;/h1-13,27H,(H,28,29,30)(H,31,32,33);;/q;2*+1/p-2
Isomeric SMILES C1=CC=C2C(=C1)C=CC(=C2N=NC3=C(C=C(C=C3)N=NC4=CC=C(C=C4)S(=O)(=O)[O-])S(=O)(=O)[O-])O.[Na+].[Na+]
WGK Germany 3
Molecular Weight 556.48
Reaxy-Rn 3883900
Reaxys-RN_link_address https://www.reaxys.com/reaxys/secured/hopinto.do?context=S&query=IDE.XRN=3883900&ln=

Documentation

📋 Safety Data Sheet (SDS)

Comprehensive hazard, handling, storage, and regulatory compliance document.

Download SDS →

✅ Certificate of Analysis (COA)

Lot-specific quality data. Enter your lot number to retrieve the exact COA.

Look up COA →

📊 Datasheet

Quick-reference summary of product specifications and applications.

View datasheet →

🔬 Specification Sheet

Full quality attributes and acceptance criteria for this grade.

View spec sheet →

Advanced Data

Taxonomic Classification

Taxonomy Tree

KingdomOrganic compounds
SuperclassOrganoheterocyclic compounds
ClassAzobenzenes
SubclassNot available
Intermediate Tree Nodes Not available
Direct ParentAzobenzenes
Alternative Parents Naphthalenes  Benzenesulfonic acids and derivatives  Benzenesulfonyl compounds  1-sulfo,2-unsubstituted aromatic compounds  Phenoxides  Sulfonyls  Organosulfonic acids  Azo compounds  Propargyl-type 1,3-dipolar organic compounds  Organopnictogen compounds  Organooxygen compounds  Organic sodium salts  Organic oxides  Hydrocarbon derivatives  
Molecular FrameworkAromatic homopolycyclic compounds
Substituents Azobenzene - Naphthalene - Benzenesulfonate - Arylsulfonic acid or derivatives - Benzenesulfonyl group - 1-sulfo,2-unsubstituted aromatic compound - Phenoxide - Monocyclic benzene moiety - Benzenoid - Organic sulfonic acid or derivatives - Organosulfonic acid or derivatives - Organosulfonic acid - Sulfonyl - Azo compound - Organic alkali metal salt - Organic 1,3-dipolar compound - Propargyl-type 1,3-dipolar organic compound - Organic sodium salt - Hydrocarbon derivative - Organosulfur compound - Organooxygen compound - Organonitrogen compound - Organic oxide - Organopnictogen compound - Organic salt - Organic nitrogen compound - Organic oxygen compound - Aromatic homopolycyclic compound
DescriptionThis compound belongs to the class of organic compounds known as azobenzenes. These are organonitrogen aromatic compounds that contain a central azo group, where each nitrogen atom is conjugated to a benzene ring.
External Descriptors organic sodium salt
3D Structure
Interactive Chemical Structure Model





Certificates(CoA,COO,BSE/TSE and Analysis Chart)
C of A & Other Certificates(BSE/TSE, COO):
Analytical Chart:

Find and download the COA for your product by matching the lot number on the packaging.

13 results found

Lot NumberCertificate TypeDateItem
G2228490Certificate of AnalysisMay 19, 2026 A121933
J2524274Certificate of AnalysisOct 13, 2025 A121933
J2524294Certificate of AnalysisOct 13, 2025 A121933
J2109088Certificate of AnalysisJul 10, 2025 A121933
I2413611Certificate of AnalysisSep 04, 2024 A121933
G2411231Certificate of AnalysisJun 25, 2024 A121933
J1910114Certificate of AnalysisJul 07, 2023 A121933
A2330504Certificate of AnalysisSep 06, 2022 A121933
K2226135Certificate of AnalysisSep 06, 2022 A121933
K2226137Certificate of AnalysisSep 06, 2022 A121933
K2226138Certificate of AnalysisSep 06, 2022 A121933
K2226228Certificate of AnalysisSep 06, 2022 A121933
G2228491Certificate of AnalysisJun 17, 2022 A121933

Show more ⌵

Chemical and Physical Properties
Solubilityethanol: 1 mg/mL H2O: >30 mg/mL
Flash Point(°F)572°F
Flash Point(°C)300℃
Melt Point(°C)181-188°C
Molecular Weight556.500 g/mol
XLogP3
Hydrogen Bond Donor Count1
Hydrogen Bond Acceptor Count11
Rotatable Bond Count4
Exact Mass556.01 Da
Monoisotopic Mass556.01 Da
Topological Polar Surface Area201.000 Ų
Heavy Atom Count37
Formal Charge0
Complexity958.000
Isotope Atom Count0
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
The total count of all stereochemical bonds0
Covalently-Bonded Unit Count3
Citations of This Product
References
1. Ye Jiang, Lijun Du, Wenyuan Lang, Shuyu Liu, Bing Xue, Shuguang Yang.  (2023)  Nanofiltration membrane fabricated by combination of phase inversion and stepwise interfacial complexation.  Surfaces and Interfaces,      [PMID:] [10.1016/j.surfin.2023.103786]
2. Ningning Gao, Wenbin Xie, Lijing Xu, Qingping Xin, Junkui Gao, Junjun Shi, Jin Zhong, Wenxiong Shi, Huiguo Wang, Kongyin Zhao, Ligang Lin.  (2023)  Characterization of a chlorine resistant and hydrophilic TiO2/calcium alginate hydrogel filtration membrane used for protein purification maintaining protein structure.  INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES,      [PMID:37591433] [10.1016/j.ijbiomac.2023.126367]
3. Ying Wang, Yue Yang, Jixiao Wang, Zhi Wang, Song Zhao.  (2022)  Supramolecular enzymatic membranes comprising of β-cyclodextrin and laccase for efficient removal and desalination of small molecules.  DESALINATION,      [PMID:] [10.1016/j.desal.2022.116198]
4. Zhiyuan Zha, Song Zhao, Guangqing Ma, Aaron S Pittman, Zhi Wang, Jixiao Wang.  (2021)  Covalent organic framework membrane reconstructed through intra-pore reaction having tunable performance for molecular separation.  SEPARATION AND PURIFICATION TECHNOLOGY,      [PMID:] [10.1016/j.seppur.2021.120387]
5. Zhiyun Kong, Bing Zhang, Xiaolei Wang, Zifei Qi, Chan Huang, Haike Li, Huan Zhang, Huicai Wang.  (2024)  Gel composite membrane with tannic acid/ferric ion separation layer for organic solvent nanofiltration.  JOURNAL OF MEMBRANE SCIENCE,      [PMID:] [10.1016/j.memsci.2024.123492]
6. Lunbo Xu, Yu Liu, Wei Wang, Shusu Shen, Ganwei Zhang, Renbi Bai.  (2025)  Highly permeable MOF-808/PVDF mixed matrix membrane assisted by ionic liquid exhibits efficient photocatalytic self-cleaning ability in the treatment of dye wastewater.  COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,      [PMID:] [10.1016/j.colsurfa.2025.136722]
7. Haike Li, Zhiyun Kong, Huan Zhang, Xiaolei Wang, Xin Wei, Ruichao Yang, Xueyi Zhang.  (2025)  HKUST-1 bridged calcium alginate gel nanofiltration membrane for separating drugs from organic solvents.  SEPARATION AND PURIFICATION TECHNOLOGY,      [PMID:] [10.1016/j.seppur.2025.132198]
8. Lei Ge, Jiaqi Li, Gaojing Du, Kai Sheng, Jingwei Hou, Binyu Zhou, Yatao Zhang, Bart Van der Bruggen, Junyong Zhu.  (2025)  Microporous Polyacylhydrazone Membranes with 3D Interconnected Nanochannels for Accurate Molecular Sieving.  ADVANCED FUNCTIONAL MATERIALS,      [PMID:] [10.1002/adfm.202504997]
9. Yang Shen, Fatoye Sawyerr, Lunbo Xu, Shusu Shen, Xiaoji Zhou.  (2024)  Mixed matrix membranes by post-modified UiO-66-NH2 for efficient treatment of dyeing wastewater.  Desalination and Water Treatment,      [PMID:] [10.1016/j.dwt.2024.100886]
10. Feilong Dong, Menglan Duan, Bo Xu, Tian Sun, Kexin Wu, Shan Luo.  (2024)  Efficient activation of peroxymonosulfate by 3D blocky sponge-supported spinel ferrite nanocomposites for convenient removal of aniline.  SEPARATION AND PURIFICATION TECHNOLOGY,      [PMID:] [10.1016/j.seppur.2024.130325]
11. Shouyuan Hu, Jie Jiang, Junbo Wang, Jiahao Hu, Yalong Li, Pei Li, Liang Chen.  (2025)  Rapid and Effective Self-healing of Graphene Oxide Membranes Enabled by Alginate Functionalization.  JOURNAL OF MEMBRANE SCIENCE,      [PMID:] [10.1016/j.memsci.2025.124084]
12. Yu Liu, Jinhai Xu, Shusu Shen, Xiaoji Zhou, Dapeng Liu, Ganwei Zhang.  (2026)  Photocatalytic self-cleaning PVDF membrane modified with NM88B@TiO2 exhibits excellent anti-fouling and separation capabilities.  Journal of Environmental Chemical Engineering,  14  (2): (121939).  [PMID:] [10.1016/j.jece.2026.121939]
Solution Calculators
Reviews

Customer Reviews

Shall we send you a message when we have discounts available?

Remind me later

Thank you! Please check your email inbox to confirm.

Oops! Notifications are disabled.