ISO 5549:1978
Caseins and caseinates — Determination of protein content (Reference method)
Reference number
ISO 5549:1978
Edición 1
1978-06
© ISO 2024
Retirada
Retirada (Edición 1, 1978)

Resumen

Does not apply to caseins and caseinates containing ammonium caseinate or other ammonium compounds, or other nitrogenous nonprotein compounds. The principle of determination consists in digesting a test portion with a mixture of potassium sulphate and sulphuric acid, in the presence of copper(II) sulphate as catalyst, to convert organic nitrogen into ammoniacal nitrogen, distilling and absorbing the ammonia in boric acid solution, titrating with standard volumetric hydrochloric acid solution and multiplying the resualt by the factor 6.38.

Informaciones generales

  • Estado
     : Retirada
    Fecha de publicación
     : 1978-06
    Etapa
    : Retirada de la Norma Internacional [95.99]
  • Edición
     : 1
    Número de páginas
     : 3
  • Comité Técnico :
    ISO/TC 34/SC 5
    ICS :
    67.100.99 
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