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Cat.No. 5908 - Bis-ANS | C32H22K2N2O6S2 | CAS No. 65664-81-5
Description: Fluorescent probe for nonpolar cavities in proteins; used to detect Aβ fibres
Chemical Name: 4,4'-Bis(phenylamino)-[1,1'-binaphthalene]-5,5'-disulfonic acid dipotassium salt
Purity: ≥97% (HPLC)

Biological Activity

Fluorescent probe for nonpolar cavities in proteins. Used to detect Aβ fibre (Kd = ~80 nM); exhibits distinct fluorescent profiles for fibres and oligomers. Fluoresces in hydrophobic environments, negligible fluorescence in water solutions. Excitation\emission λ ~ 355\520 nm at pH 7.4.

Technical Data

M. Wt 672.85
Formula C32H22K2N2O6S2
Storage Store at RT
Purity ≥97% (HPLC)
CAS Number 65664-81-5
PubChem ID 16213473
Smiles O=S(C1=CC=CC2=C1C(NC3=CC=CC=C3)=CC=C2C4=CC=C(NC5=CC=CC=C5)C6=C(S(=O)([O-])=O)C=CC=C46)([O-])=O.[K+].[K+]

The technical data provided above is for guidance only. For batch specific data refer to the Certificate of Analysis.

All Tocris products are intended for laboratory research use only.

Solubility Data

Solvent Max Conc. mg/mL Max Conc. mM
DMSO 67.28 100
water 13.46 20

Preparing Stock Solutions

The following data is based on the product molecular weight 672.85. Batch specific molecular weights may vary from batch to batch due to solvent of hydration, which will affect the solvent volumes required to prepare stock solutions.

Select a batch to recalculate based on the batch molecular weight:
Concentration / Solvent Volume / Mass 1 mg 5 mg 10 mg
1 mM 1.49 mL 7.43 mL 14.86 mL
5 mM 0.3 mL 1.49 mL 2.97 mL
10 mM 0.15 mL 0.74 mL 1.49 mL
50 mM 0.03 mL 0.15 mL 0.3 mL

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Product Datasheets

Safety Datasheet


References are publications that support the products' biological activity.

Rosen et al (1969) Dimer formation from 1-amino-8-naphthalenesulfonate catalyzed by bovine serum albumin. A new fluorescent molecule with exceptional binding properties. Biochemistry 8 3915 PMID: 5388144

Younan et al (2015) A comparison of three fluorophores for the detection of amyloid fibers and prefibrillar oligomeric assemblies. ThT (Thioflavin T); ANS (1-Anilinonaphthalene-8-sulfonic Acid); and bisANS (4,4'-Dianilino-1,1'-binaphthyl-5,5'-disulfonic Acid). Biochemistry 54 4297 PMID: 26087242

If you know of a relevant reference for Bis-ANS, please let us know.

Keywords: Amyloid β Aβ peptides fibers fibres oligomers oligomeric fluorescent probe detects Fluorescent Probes

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New Product Guide

New Product Guide (Spring/Summer 2017)

Our new product guide highlights over 130 new products added to the Tocris Bioscience range during the first half of 2017.

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  • Epigenetics
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  • Stem Cells

Pathways for Bis-ANS


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