E129

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  • Identifiers

    CAS number
    25956-17-6

    Molecular formula
    C18H14N2Na2O8S2

    SMILES
    CC1=CC(=C(C=C1S(=O)(=O)[O-])OC)N=NC2=C(C=CC3=C2C=CC(=C3)S(=O)(=O)[O-])O.[Na+].[Na+]

    Safety labels

  • Odor profile

    Fragrance
    Odorless 79.89%
    Cooked 21.64%
    Savory 21.13%
    Bitter 19.01%
    Roasted 17.57%
    Burnt 16.6%
    Milky 15.49%
    Meaty 14.27%
    Grape 14.16%
    Clean 13.32%

     

    Flavor
    Bitter 91.0%
    Odorless 33.3%
    Bland 22.48%
    Nitrile 20.06%
    Very strong 18.38%
    Taco 18.3%
    Bread crust 18.29%
    Indole 18.03%
    Sweet-like 18.01%
    Cedarleaf 17.91%

     

    Odor impact est.
    Low

  • Properties

    pKa est.
    4.52 (weak acid)

    Molecular weight
    496.4 g/mol

    Flash point

    • 319.68 ˚C est.

  • Synonyms

    • E129
    • RefChem:1084024
    • Allura Red AC
    • 25956-17-6
    • Allura Red
    • Allura red AC dye
    • Food Red No. 40
    • C.I. Food Red 17
    • Food red 17
    • Curry red
    • FD&C Red No. 40
    • Fancy Red
    • Allura Red 40
    • Japan Food Red No. 40
    • ALLURA RED C.I.16035
    • Japan Red 40
    • CI 16035
    • Red 40
    • Red No. 40
    • FD and C Red No. 40
    • WZB9127XOA
    • Allura Red AC (E 129)
    • DTXSID4024436
    • FD & C Red no. 40
    • 2-Naphthalenesulfonic acid, 6-hydroxy-5-((2-methoxy-5-methyl-4-sulfophenyl)azo)-, disodium salt
    • Sodium 6-hydroxy-5-((2-methoxy-5-methyl-4-sulfonatophenyl)diazenyl)naphthalene-2-sulfonate
    • Allura Red AC 100 microg/mL in Water
    • CI 16035; Food Red 17; Fancy Red;
    • Disodium 6-hydroxy-5-((2-methoxy-5-methyl-4-sulfophenyl)azo)-2-naphthalenesulfonate
    • Allura Red AC (Technical Grade)
    • FDC Red 40
    • CHEMBL174821
    • Disodium 6-hydroxy-5-[(2-methoxy-5-methyl-4-sulfophenyl)azo]-2-naphthalenesulfonate
    • 2-Naphthalenesulfonic acid, 6-hydroxy-5-[(2-methoxy-5-methyl-4-sulfophenyl)azo]-, disodium salt
    • sodium (E)-6-hydroxy-5-((2-methoxy-5-methyl-4-sulfonatophenyl)diazenyl)naphthalene-2-sulfonate
    • CCRIS 3493
    • MFCD00059526
    • FDC Red 40 dye
    • HSDB 7260
    • 2-Naphthalenesulfonic acid, 6-hydroxy-5-[2-(2-methoxy-5-methyl-4-sulfophenyl)diazenyl]-, sodium salt (1:2)
    • EINECS 247-368-0
    • FD&C Red 40
    • UNII-WZB9127XOA
    • E 129
    • al-lura red ac
    • C. I. 16035
    • disodium 6-hydroxy-5-((2-methoxy-5-methyl-4-sulfonatophenyl)diazenyl)naphthalene-2-sulfonate
    • Disodium 6-hydroxy-5-[(2-methoxy-5-methyl-4-sulfonatophenyl)diazenyl]naphthalene-2-sulfonate
    • disodium 6-hydroxy-5-[(E)-(2-methoxy-5-methyl-4-sulfonatophenyl)diazenyl]naphthalene-2-sulfonate
    • 763 - Colours
    • 2-Naphthalenesulfonic acid, 6-hydroxy-5-(2-(2-methoxy-5-methyl-4-sulfophenyl)diazenyl)-, sodium salt (1:2)
    • FDC Red No. 40
    • ALLURA RED [FCC]
    • FD and C Red No.40
    • CI-FOOD RED 17
    • Disodium 6-hydroxy-5-((6-methoxy-4-sulfo-m-tolyl)azo)-2-naphthalenesulfonate
    • EC 247-368-0
    • 2-Naphthalenesulfonic acid, 6-hydroxy-5-((6-methoxy-4-sulfo-m-tolyl)azo)-, disodium salt
    • ALLURA RED AC [MI]
    • FD&C RED NO.40
    • SCHEMBL324089
    • SCHEMBL340786
    • SCHEMBL563950
    • D&C RED NO. 40
    • DTXCID504436
    • INS NO.129
    • orb1684778
    • orb3025935
    • ALLURA RED AC [MART.]
    • CHEMBL3188816
    • SCHEMBL29351791
    • SCHEMBL29671480
    • DTXSID70860355
    • INS-129
    • MSK2412
    • ALLURA RED AC DYE [HSDB]
    • CHEBI:172687
    • POXPUHKJGLHZEM-DJOSVPKASA-L
    • POXPUHKJGLHZEM-VIPPSAFOSA-L
    • Allura Red AC, analytical standard
    • D&C RED NO. 40 [II]
    • F D & C RED NO. 40
    • Allura Red AC, Dye content 80 %
    • FD&C RED NO. 40 [FCC]
    • FD&C RED NO. 40 [II]
    • Tox21_300393
    • AKOS015903081
    • AKOS025310826
    • FA17299
    • Disodium 6-hydroxy-5-((2-methoxy-4-sulphonato-m-tolyl)azo)naphthalene-2-sulphonate
    • Disodium 6-hydroxy-5-((2-methoxy-5-methyl-4-sulfophenyl)azo)-2-naphthalene- sulfonate
    • disodium;6-hydroxy-5-[(2-methoxy-5-methyl-4-sulfonatophenyl)diazenyl]naphthalene-2-sulfonate
    • F D & C RED #40 [VANDF]
    • NCGC00254423-01
    • 6-Hydroxy-5-((2-methoxy-5-methyl-4-sulfophenyl)azo)-2-naphthalene- sulfonic acid, disodium salt
    • BP-31017
    • DA-60931
    • F D & C RED #40 LAKE [VANDF]
    • C.I.16035
    • CAS-25956-17-6
    • A0943
    • CI-(1975)NO.16035
    • E-129
    • F0325
    • NS00050913
    • NS00100125
    • D70160
    • Q419895
    • 6-Hydroxy-5-[(6-methoxy-4-sulfo-m- toly l)azo]-2-naphthalenesulfonic acid disodium
    • disodium;6-hydroxy-5-[(2-methoxy-5-methyl-4-sulonatophenyl)diazenyl]naphthalene-2-sulonate
    • 1016649-41-4
    • 6-Hydroxy-5-[2-(2-methoxy-5-methyl-4-sulfophenyl)diazenyl]-2-naphthalenesulfonic acid sodium
    • disodium;(5Z)-5-[(2-methoxy-5-methyl-4-sulfonatophenyl)hydrazinylidene]-6-oxonaphthalene-2-sulfonate
    • 25956-17-6

  • Applications

    Allura Red AC (E129; CAS 25956-17-6) is widely used as a synthetic colorant in the food and beverage sector, coloring beverages, candies, snacks, dairy and bakery products, and ice cream; it is also employed as a color additive in pharmaceuticals (e.g., tablet and capsule coatings and syrups) and may appear in cosmetics and personal care products in certain markets, subject to regulatory limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 2.3
    methanol 2.75
    isopropanol 1.73
    water 0.0
    ethyl acetate 3.15
    n-propanol 2.32
    acetone 18.96
    n-butanol 1.34
    acetonitrile 3.72
    DMF 48.57
    toluene 0.73
    isobutanol 0.95
    1,4-dioxane 21.12
    methyl acetate 7.23
    THF 48.59
    2-butanone 15.68
    n-pentanol 0.99
    sec-butanol 2.08
    n-hexane 0.01
    ethylene glycol 1.36
    NMP 25.59
    cyclohexane 0.06
    DMSO 33.8
    n-butyl acetate 2.35
    n-octanol 1.2
    chloroform 2.36
    n-propyl acetate 2.74
    acetic acid 5.52
    dichloromethane 2.8
    cyclohexanone 15.41
    propylene glycol 1.91
    isopropyl acetate 2.05
    DMAc 49.34
    2-ethoxyethanol 8.16
    isopentanol 0.78
    n-heptane 0.03
    ethyl formate 2.79
    1,2-dichloroethane 2.26
    n-hexanol 0.74
    2-methoxyethanol 20.44
    isobutyl acetate 0.95
    tetrachloromethane 0.11
    n-pentyl acetate 2.9
    transcutol 17.49
    n-heptanol 0.96
    ethylbenzene 0.23
    MIBK 1.88
    2-propoxyethanol 9.65
    tert-butanol 1.61
    MTBE 1.26
    2-butoxyethanol 5.75
    propionic acid 3.05
    o-xylene 0.38
    formic acid 3.85
    diethyl ether 1.75
    m-xylene 0.28
    p-xylene 0.45
    chlorobenzene 0.79
    dimethyl carbonate 3.67
    n-octane 0.03
    formamide 10.37
    cyclopentanone 30.1
    2-pentanone 5.69
    anisole 1.76
    cyclopentyl methyl ether 2.55
    gamma-butyrolactone 21.29
    1-methoxy-2-propanol 10.64
    pyridine 12.57
    3-pentanone 4.49
    furfural 15.1
    n-dodecane 0.04
    diethylene glycol 7.76
    diisopropyl ether 0.23
    tert-amyl alcohol 1.61
    acetylacetone 11.67
    n-hexadecane 0.05
    acetophenone 2.88
    methyl propionate 4.19
    isopentyl acetate 1.63
    trichloroethylene 5.68
    n-nonanol 1.36
    cyclohexanol 1.55
    benzyl alcohol 1.93
    2-ethylhexanol 0.42
    isooctanol 0.61
    dipropyl ether 1.11
    1,2-dichlorobenzene 0.63
    ethyl lactate 1.86
    propylene carbonate 3.88
    n-methylformamide 12.34
    2-pentanol 0.73
    n-pentane 0.02
    1-propoxy-2-propanol 5.82
    1-methoxy-2-propyl acetate 4.4
    2-(2-methoxypropoxy) propanol 6.19
    mesitylene 0.14
    ε-caprolactone 8.35
    p-cymene 0.26
    epichlorohydrin 20.17
    1,1,1-trichloroethane 0.83
    2-aminoethanol 2.31
    morpholine-4-carbaldehyde 32.75
    sulfolane 25.57
    2,2,4-trimethylpentane 0.01
    2-methyltetrahydrofuran 7.02
    n-hexyl acetate 3.01
    isooctane 0.01
    2-(2-butoxyethoxy)ethanol 9.4
    sec-butyl acetate 1.18
    tert-butyl acetate 2.15
    decalin 0.02
    glycerin 5.16
    diglyme 16.92
    acrylic acid 3.65
    isopropyl myristate 1.39
    n-butyric acid 2.44
    acetyl acetate 2.33
    di(2-ethylhexyl) phthalate 1.57
    ethyl propionate 1.86
    nitromethane 23.69
    1,2-diethoxyethane 5.6
    benzonitrile 2.41
    trioctyl phosphate 1.15
    1-bromopropane 0.62
    gamma-valerolactone 47.73
    n-decanol 1.02
    triethyl phosphate 0.85
    4-methyl-2-pentanol 0.31
    propionitrile 2.78
    vinylene carbonate 4.15
    1,1,2-trichlorotrifluoroethane 12.06
    DMS 3.28
    cumene 0.13
    2-octanol 0.76
    2-hexanone 4.64
    octyl acetate 2.02
    limonene 0.34
    1,2-dimethoxyethane 17.78
    ethyl orthosilicate 0.78
    tributyl phosphate 1.33
    diacetone alcohol 5.28
    N,N-dimethylaniline 0.97
    acrylonitrile 5.78
    aniline 1.71
    1,3-propanediol 4.13
    bromobenzene 0.58
    dibromomethane 1.12
    1,1,2,2-tetrachloroethane 4.26
    2-methyl-cyclohexyl acetate 1.54
    tetrabutyl urea 3.51
    diisobutyl methanol 0.31
    2-phenylethanol 2.2
    styrene 0.36
    dioctyl adipate 2.32
    dimethyl sulfate 5.49
    ethyl butyrate 1.83
    methyl lactate 4.2
    butyl lactate 3.01
    diethyl carbonate 1.12
    propanediol butyl ether 5.22
    triethyl orthoformate 1.61
    p-tert-butyltoluene 0.25
    methyl 4-tert-butylbenzoate 3.5
    morpholine 22.0
    tert-butylamine 0.39
    n-dodecanol 0.73
    dimethoxymethane 16.24
    ethylene carbonate 3.11
    cyrene 6.12
    2-ethoxyethyl acetate 6.14
    2-ethylhexyl acetate 1.16
    1,2,4-trichlorobenzene 1.24
    4-methylpyridine 5.44
    dibutyl ether 1.54
    2,6-dimethyl-4-heptanol 0.31
    DEF 6.28
    dimethyl isosorbide 10.32
    tetrachloroethylene 1.99
    eugenol 4.83
    triacetin 4.1
    span 80 4.64
    1,4-butanediol 1.32
    1,1-dichloroethane 1.3
    2-methyl-1-pentanol 0.61
    methyl formate 10.27
    2-methyl-1-butanol 0.84
    n-decane 0.07
    butyronitrile 1.84
    3,7-dimethyl-1-octanol 0.74
    1-chlorooctane 0.45
    1-chlorotetradecane 0.21
    n-nonane 0.05
    undecane 0.05
    tert-butylcyclohexane 0.01
    cyclooctane 0.02
    cyclopentanol 3.02
    tetrahydropyran 7.43
    tert-amyl methyl ether 1.03
    2,5,8-trioxanonane 13.5
    1-hexene 0.11
    2-isopropoxyethanol 3.96
    2,2,2-trifluoroethanol 2.15
    methyl butyrate 2.94

    Scent© AI

1 4

IFRA standard 51

Recommendation
No restriction
Maximum acceptable concentrations in the finished product (%)
Category 1
Products applied to the lips
 No restriction Category 7A
Rinse-off products applied to the hair with some hand contact
 No restriction
Category 2
Products applied to the axillae
 No restriction Category 7B
Leave-on products applied to the hair with some hand contact
 No restriction
Category 3
Products applied to the face/body using fingertips
 No restriction Category 8
Products with significant anogenital exposure
 No restriction
Category 4
Products related to fine fragrance
 No restriction Category 9
Products with body and hand exposure, primarily rinse off
 No restriction
Category 5A
Body lotion products applied to the body using the hands (palms), primarily leave on
 No restriction Category 10A
Household care products with mostly hand contact
 No restriction
Category 5B
Face moisturizer products applied to the face using the hands (palms), primarily leave on
 No restriction Category 10B
Household care products with mostly hand contact, including aerosol/spray products (with potential leave-on skin contact)
 No restriction
Category 5C
Hand cream products applied to the hands using the hands (palms), primarily leave on
 No restriction Category 11A
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate without UV exposure
 No restriction
Category 5D
Baby Creams, baby Oils and baby talc
 No restriction Category 11B
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate with potential UV exposure
 No restriction
Category 6
Products with oral and lip exposure
 No restriction Category 12
Products not intended for direct skin contact, minimal or insignificant transfer to skin
 No restriction