Analysis of traces of anionic detergents in oils and fats

  • J. H. M. Rek
  • A. C. M. Appel


A method to analyze oils and fats for anionic detergents, mainly sodium lauryl sulphate (NaLS), has been developed. After extracting the detergent from the oil, a chloroform-soluble complex with methylene blue is formed, and the concentration of this complex is determined spectrophotometrically. The method was found suitable for oils and fats containing 0.05 to 5.0 mg NaLS per kg. The analysis can only be used to assess fully refined oils and fats because partly refined and commercially available products may contain minor components and emulsifiers also solubilizing methylene blue into chloroform.


Methylene Blue Extraction Yield Cocoa Butter Sodium Lauryl Sulphate Stearin 
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Copyright information

© The American Oil Chemists’ Society 1979

Authors and Affiliations

  • J. H. M. Rek
    • 1
  • A. C. M. Appel
    • 1
  1. 1.Unilever ResearchVlaardingenThe Netherlands

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