A byproduct in the synthesis of food dyes
Technical Support & Resources

Information provided in the product description is from published literature. Due to the nature of scientific experimentation, your results (e.g., selectivity and effective concentrations) or specific application for this product may differ. If you have questions about how this product fits your application, please contact our technical support staff.

Visit our FAQ

Contact Us

Toll Free Phone (USA and Canada Only): (888) 526-5351
Direct Phone: (734) 975-3888

Request Technical Support

Technical Support Request

To streamline the process attach the appropriate questionnaire to your inquiry.

Download IHC QuestionnaireDownload WB Questionnaire

View Our Privacy Statement for details on how we use and protect your data. In addition, this site is protected by hCaptcha and its Privacy Policy and Terms of Service apply.

Product Categories

Product Type

Biochemicals

6,6′-Oxybis(2-naphthalenesulfonate) (sodium salt)

Item No. 45595

Product Insert (PDF)Safety Data Sheet (SDS) (PDF)
Technical Information
Formal Name
6,6′-oxybis-2-naphthalenesulfonic acid, disodium salt
CAS Number
61551-82-4
Synonyms
  • DONS
Molecular Formula
C20H12O7S2 • 2Na
Formula Weight
474.4
Purity
≥95%
Formulation (Request formulation change)
A solid
SMILES
[O-]S(=O)(C1=CC=C2C=C(OC3=CC4=CC=C(S([O-])(=O)=O)C=C4C=C3)C=CC2=C1)=O.[Na+].[Na+]
InChi Code
InChI=1S/C20H14O7S2.2Na/c21-28(22,23)19-7-3-13-9-17(5-1-15(13)11-19)27-18-6-2-16-12-20(29(24,25)26)8-4-14(16)10-18;;/h1-12H,(H,21,22,23)(H,24,25,26);;/q;2*+1/p-2
InChi Key
FBGQGMKNWOSSAG-UHFFFAOYSA-L
Shipping & Storage Information
Storage
-20°C
Shipping
Room temperature in continental US; may vary elsewhere
Recommended Products

Certificates of Analysis & Batch Specific Data

Provide batch numbers separated by commas to download or request available product inserts, QC sheets, certificates of analysis, data packs, and GC-MS data.

Download most recent Certificate of Analysis for this product

    1 mg

    $109

    Add

    5 mg

    $273

    Add

    10 mg

    $436

    Add
    Product Description

    6,6’-Oxybis(2-naphthalenesulfonate) is a byproduct in the synthesis of FD&C Yellow No. 6 and FD&C Red No. 40 (Allura Red AC; Item No. 44514).1,2 It is formed during the synthesis of Schaeffer’s salt, an intermediate used in the synthesis of FD&C Yellow No. 6.1 6,6’-Oxybis(2-naphthalenesulfonate) is also an impurity formed in the synthesis of FD&C Yellow No. 5.3

    WARNING This product is not for human or veterinary use.

    References & Product Citations
    Product Description References

    1. Bailey, J.E., and Calvey, R.J. Spectral compilation of dyes, intermediates, and other reaction products structurally related to FD&C Yellow No. 6. J. Assoc. Off. Anal. Chem. 58(6), 1087-1128 (2020).

    2. Cox, E.A., and Reed, G.F. High performance liquid chromatographic determination of intermediates and two reaction by-products in FD&C Red No. 40: Collaborative study. J. Assoc. Off. Anal. Chem. 64(2), 324-331 (2020).

    3. Ogura, N., Nakamura, Y., Shinomiya, K., et al. Separation of impurities in commercial food Yellow No. 5 by counter alternative current chromatography and structural analyses. Anal. Sci. 11, 759-763 (1994).