Alanyl ornithine

Overview IFRA Request a quote

  • Identifiers

    CAS number
    643755-41-3

    Molecular formula
    C8H17N3O3

    SMILES
    C[C@@H](C(=O)N[C@@H](CCCN)C(=O)O)N

    Safety labels

  • Odor profile

    Fragrance
    Odorless 68.76%
    Fishy 41.69%
    Savory 37.23%
    Meaty 26.39%
    Cooling 23.58%
    Sweet 18.49%
    Cheesy 17.97%
    Cooked 16.91%
    Ripe 16.35%
    Animal 16.04%

     

    Flavor
    Odorless 61.58%
    Bitter 34.71%
    Bland 31.99%
    Mild 30.87%
    Sweet-like 22.42%
    Faint 22.3%
    Yeast 20.57%
    Nitrile 19.94%
    Bouillon 18.96%
    Bloody 18.95%

     

    Odor impact est.
    Low

  • Properties

    XLogP3-AA
    -4.7

    pKa est.
    5.53 (weak acid)

    Molecular weight
    203.24 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Ultra slow

    Boiling point est.
    384°C

    Flash point

    • 197.65 ˚C est.

  • Synonyms

    • Alanyl ornithine
    • Dipeptide ao-a
    • 643755-41-3
    • L-Ornithine, L-alanyl-
    • UNII-ZR4JSN38SV
    • Alanyl ornithine [INCI]
    • ZR4JSN38SV
    • RefChem:199403
    • (S)-5-amino-2-((S)-2-aminopropanamido)pentanoic acid
    • (2S)-5-amino-2-[[(2S)-2-aminopropanoyl]amino]pentanoic acid
    • alanylornithine
    • Ala-Orn
    • orb1986586
    • CHEMBL2371842
    • SCHEMBL29406243
    • AKOS040750287
    • Q27295860
    • 643755-41-3

  • Applications

    Alanyl ornithine (CAS 643755-41-3) is a dipeptide used as a chemical building block in peptide synthesis for pharmaceutical and biotech manufacturing; in cosmetics/personal care it may serve as a skin-conditioning ingredient and a carrier for peptide actives in peptide-based formulations; in research and development it is used as a substrate in enzymatic studies and as a model dipeptide in synthesis experiments; and in general peptide production it functions as an intermediate in synthetic pathways for related compounds.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 0.31
    methanol 1.79
    isopropanol 0.17
    water 214.1
    ethyl acetate 0.22
    n-propanol 0.22
    acetone 0.19
    n-butanol 0.22
    acetonitrile 0.19
    DMF 10.89
    toluene 0.14
    isobutanol 0.23
    1,4-dioxane 0.83
    methyl acetate 0.13
    THF 0.99
    2-butanone 0.16
    n-pentanol 0.22
    sec-butanol 0.18
    n-hexane 0.1
    ethylene glycol 14.27
    NMP 46.36
    cyclohexane 0.22
    DMSO 39.77
    n-butyl acetate 0.31
    n-octanol 0.09
    chloroform 0.14
    n-propyl acetate 0.18
    acetic acid 17.36
    dichloromethane 0.21
    cyclohexanone 1.63
    propylene glycol 6.65
    isopropyl acetate 0.21
    DMAc 12.81
    2-ethoxyethanol 2.66
    isopentanol 0.28
    n-heptane 0.11
    ethyl formate 0.82
    1,2-dichloroethane 0.19
    n-hexanol 0.37
    2-methoxyethanol 6.33
    isobutyl acetate 0.14
    tetrachloromethane 0.12
    n-pentyl acetate 0.17
    transcutol 3.68
    n-heptanol 0.23
    ethylbenzene 0.16
    MIBK 0.21
    2-propoxyethanol 2.67
    tert-butanol 0.35
    MTBE 0.11
    2-butoxyethanol 1.46
    propionic acid 1.99
    o-xylene 0.35
    formic acid 147.63
    diethyl ether 0.08
    m-xylene 0.22
    p-xylene 0.25
    chlorobenzene 0.13
    dimethyl carbonate 0.77
    n-octane 0.05
    formamide 45.49
    cyclopentanone 1.99
    2-pentanone 0.2
    anisole 0.24
    cyclopentyl methyl ether 0.66
    gamma-butyrolactone 4.41
    1-methoxy-2-propanol 2.72
    pyridine 0.74
    3-pentanone 0.26
    furfural 12.45
    n-dodecane 0.02
    diethylene glycol 12.95
    diisopropyl ether 0.07
    tert-amyl alcohol 0.39
    acetylacetone 0.97
    n-hexadecane 0.02
    acetophenone 0.69
    methyl propionate 0.36
    isopentyl acetate 0.37
    trichloroethylene 0.32
    n-nonanol 0.11
    cyclohexanol 0.87
    benzyl alcohol 0.81
    2-ethylhexanol 0.3
    isooctanol 0.22
    dipropyl ether 0.23
    1,2-dichlorobenzene 0.25
    ethyl lactate 1.11
    propylene carbonate 3.35
    n-methylformamide 4.92
    2-pentanol 0.16
    n-pentane 0.05
    1-propoxy-2-propanol 1.41
    1-methoxy-2-propyl acetate 1.11
    2-(2-methoxypropoxy) propanol 1.84
    mesitylene 0.23
    ε-caprolactone 2.37
    p-cymene 0.21
    epichlorohydrin 1.04
    1,1,1-trichloroethane 0.08
    2-aminoethanol 6.89
    morpholine-4-carbaldehyde 21.99
    sulfolane 29.25
    2,2,4-trimethylpentane 0.04
    2-methyltetrahydrofuran 0.53
    n-hexyl acetate 0.17
    isooctane 0.02
    2-(2-butoxyethoxy)ethanol 2.16
    sec-butyl acetate 0.15
    tert-butyl acetate 0.32
    decalin 0.11
    glycerin 47.71
    diglyme 3.69
    acrylic acid 5.86
    isopropyl myristate 0.09
    n-butyric acid 2.26
    acetyl acetate 0.57
    di(2-ethylhexyl) phthalate 0.48
    ethyl propionate 0.26
    nitromethane 6.14
    1,2-diethoxyethane 0.26
    benzonitrile 0.45
    trioctyl phosphate 0.28
    1-bromopropane 0.07
    gamma-valerolactone 9.22
    n-decanol 0.09
    triethyl phosphate 0.62
    4-methyl-2-pentanol 0.17
    propionitrile 0.14
    vinylene carbonate 3.21
    1,1,2-trichlorotrifluoroethane 11.43
    DMS 0.63
    cumene 0.18
    2-octanol 0.12
    2-hexanone 0.17
    octyl acetate 0.12
    limonene 0.27
    1,2-dimethoxyethane 1.87
    ethyl orthosilicate 0.56
    tributyl phosphate 0.32
    diacetone alcohol 1.73
    N,N-dimethylaniline 0.55
    acrylonitrile 0.4
    aniline 0.48
    1,3-propanediol 4.75
    bromobenzene 0.11
    dibromomethane 0.12
    1,1,2,2-tetrachloroethane 0.4
    2-methyl-cyclohexyl acetate 0.52
    tetrabutyl urea 0.6
    diisobutyl methanol 0.24
    2-phenylethanol 0.76
    styrene 0.13
    dioctyl adipate 0.23
    dimethyl sulfate 4.79
    ethyl butyrate 0.35
    methyl lactate 3.67
    butyl lactate 0.84
    diethyl carbonate 0.31
    propanediol butyl ether 2.12
    triethyl orthoformate 0.53
    p-tert-butyltoluene 0.2
    methyl 4-tert-butylbenzoate 1.13
    morpholine 1.25
    tert-butylamine 0.17
    n-dodecanol 0.09
    dimethoxymethane 1.05
    ethylene carbonate 1.99
    cyrene 9.39
    2-ethoxyethyl acetate 0.4
    2-ethylhexyl acetate 0.29
    1,2,4-trichlorobenzene 0.35
    4-methylpyridine 0.52
    dibutyl ether 0.08
    2,6-dimethyl-4-heptanol 0.24
    DEF 1.5
    dimethyl isosorbide 4.89
    tetrachloroethylene 0.56
    eugenol 1.78
    triacetin 0.71
    span 80 2.17
    1,4-butanediol 2.39
    1,1-dichloroethane 0.06
    2-methyl-1-pentanol 0.3
    methyl formate 3.35
    2-methyl-1-butanol 0.3
    n-decane 0.03
    butyronitrile 0.17
    3,7-dimethyl-1-octanol 0.11
    1-chlorooctane 0.04
    1-chlorotetradecane 0.03
    n-nonane 0.03
    undecane 0.02
    tert-butylcyclohexane 0.06
    cyclooctane 0.13
    cyclopentanol 1.07
    tetrahydropyran 0.3
    tert-amyl methyl ether 0.17
    2,5,8-trioxanonane 3.74
    1-hexene 0.11
    2-isopropoxyethanol 1.15
    2,2,2-trifluoroethanol 12.56
    methyl butyrate 0.44

    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