A colorimetric probe for the detection of phenolic compounds
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Fast Blue RR Salt

Item No. 46276

Product Insert (PDF)Safety Data Sheet (SDS) (PDF)
Technical Information
Formal Name
4-(benzoylamino)-2,5-dimethoxy-benzenediazonium, (T-4)-tetrachlorozincate(2-) (2:1)
CAS Number
14726-29-5
Synonyms
  • FBRR
Molecular Formula
C15H14N3O3 • 1/2Cl4Zn
Formula Weight
387.9
Formulation (Request formulation change)
A solid
λmax
330, 392 nm
SMILES
O=C(C1=CC=CC=C1)NC(C=C2OC)=C(C=C2[N+]#N)OC.[Cl-][Zn+2]([Cl-])([Cl-])[Cl-]
InChi Code
InChI=1S/2C15H13N3O3.4ClH.Zn/c2*1-20-13-9-12(18-16)14(21-2)8-11(13)17-15(19)10-6-4-3-5-7-10;;;;;/h2*3-9H,1-2H3;4*1H;/q;;;;;;+2/p-2
InChi Key
LLARVKAOQLUCQI-UHFFFAOYSA-L
Shipping & Storage Information
Storage
-20°C
Shipping
Room temperature in continental US; may vary elsewhere
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    1 g

    $29

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    5 g

    $138

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    10 g

    $261

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    25 g

    $616

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    Product Description

    Fast blue RR salt is a colorimetric probe for the detection of phenolic compounds.1,2,3 Upon a diazo coupling reaction with phenolic compounds, it forms azo-containing complexes that can be quantified by colorimetric detection at wavelengths that depend on the phenolic compound. Fast blue RR salt has been used to detect esterase activity and the presence of phenol-containing compounds in vitro.

    WARNING This product is not for human or veterinary use.

    References & Product Citations
    Product Description References

    1. Nakamura, K., Nishiguchi, H., Arai, R., et al. Isolating and determining the structures of colored products from the reactions of cannabinoids with Fast Blue RR. Molecules 30(17), 3462 (2025).

    2. Sampietro, D.A., Vattuone, M.A., and Catalán, C.A.N. A new colorimetric method for determination of alkylresorcinols in ground and whole-cereal grains using the diazonium salt Fast Blue RR. Food Chem. 115(3), 1170-1174 (2009).

    3. Johnson, K.J., and Ashford, A.E. A simultaneous-coupling azo dye method for the quantitative assay of esterase using α-naphthyl acetate as substrate. Histochem. J. 12(2), 221-234 (1980).