L-Threonine

    DESCRIPTION

    AppearanceWhite or almost white crystalline powder or qualified shiny flakes
    Appearance of solutionClear and not more intensely coloured than reference solution

    SPECIFICATIONS

    Assay99 to 100.5%
    IdentificationUSP29 / AJI97:Infrared Absorption
    EP5:As per EP5 (Chemical examine & Infrared Absorption)
    SolubilityDissolve in water at 25
    Transmittance
    (State of Solution)
    Clear and colourless. Not less than 98.0%
    Ninhydrin-positive substancesExamine by thin layer chromatography
    Organic Volatile ImpuritiesMeets the requirements
    ImpuritiesIndividual Impurity: max 0.5%
    Total Impurity:max 2.0%
    Chloride (Cl)USP29:max 0.5%
    EP5:max 200ppm
    AJI97: max 0.20%
    Sulphate (SO4)USP29: max 0.03%
    EP5: max 300ppm
    AJI97: max 0.020%
    Ammonium (NH4)EP5: max 100ppm
    AJI97: max 0.2%
    pHUSP29/EP5:5.0 to 6.5
    AJI97: 5.2 to 6.2
    Heavy metals
    (Pb)
    USP29: max 0.0015%
    EP5 / AJI97: max 10ppm
    CadmiumMax 1 ppm
    Sulphated ashMax 0.1 %
    Arsenic
    (As2O3)
    USP29/EP5: max 2ppm
    AJI97: max 1ppm
    Chromatographic purityAs per USP29 (by TLC)
    Loss on dryingUSP29/AJI97:max 0.2%
    EP5:max 0.5%
    Residual solventsMeets the requirements
    LeadMax 5 ppm
    Specific Rotation [°]D20USP29: -26.7
    Specific Rotation-27.6 to -29.0
    Residue on ignitionUSP29: max 0.4%
    AJI97: max 0.10%
    Other Amino AcidsConforms
    MercuryMax 1 ppm
    Iron (Fe)USP29: max 0.003%
    EP5: max 10ppm
    AJI97: max 10ppm
    Shelf life3 Years


    Direct Food Ingredients will ensure that any material supplied this specification will confirm to the above physical and chemical properties. However, we have no control over the use of the material and can accept no responsibility for problems caused by the customer's failure to ensure the material supplied is suitable for the intended use.

    This specification has been last modified on Fri 17 August 2012 (1235)

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