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Analysis of cationic and amphoteric surfactants I. Determination of their homolog distributions by gas chromatography on the basis of the Hofmann degradation

  • Published:
Journal of the American Oil Chemists’ Society

Abstract

A method (DMF-Methylate method) has been described for the homolog analysis of cationic and amphoteric surfactants having a quaternary am-monium group. The homolog distribution of cationic and amphoteric surfactants obtained by the DMF-Methylate method closely agrees with that of the original alkyldimethylamines used. Therefore, the DMF-Methylate method should be applicable to the homolog analysis of these surfactants. This method also offers qualitative information for the identifica-tion of these surfactants, since the ratio of the α-olefin to the alkyldimethylamine varies with each sur-factant. On the basis of the analysis of the elimina-tion products, it was confirmed that the main degra-dation process was the elimination of a β-hydrogen atom. This mechanism is different from that of the pyrolysis gas chromatography, which will be dis-cussed elsewhere (S. Takano, M. Kuzukawa, and M. Yamanaka, in preparation).

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Authors and Affiliations

  1. Tokyo Research Laboratories, Kao Soap Co. Ltd., 1-3, 2 Chome, Bunka, Sumida-Ku, Tokyo, Japan

    S. Takano, C. Takasaki, K. Kunihiro & M. Yamanaka

Authors
  1. S. Takano
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  2. C. Takasaki
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  3. K. Kunihiro
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  4. M. Yamanaka
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Takano, S., Takasaki, C., Kunihiro, K. et al. Analysis of cationic and amphoteric surfactants I. Determination of their homolog distributions by gas chromatography on the basis of the Hofmann degradation. J Am Oil Chem Soc 54, 139–143 (1977). https://doi.org/10.1007/BF02670781

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  • DOI: https://doi.org/10.1007/BF02670781

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