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X-Ray diffraction study of sodium soaps of monounsaturated and polyunsaturated fatty acids

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Lipids

Abstract

X-Ray powder diffraction patterns of the sodium soaps of 14 monounsaturated and polyunsaturated fatty acids were obtained at room temperature. The patterns of the soaps of 9,12-trans,trans-octadecadienoic acid, 11,14-cis,cis-eicosadienoic acid 11,14,17-allcis-eicosatrienoic acid and 5 monounsaturated fatty acids were typical of the crystalline lamellar phase. The patterns of the soaps of 9,12-cis,cis-octadecadienoic, allcis-9,12,15-octadecatrienoic, allcis-8,11,14-eicostrienoic, allcis-5,8,11,14-eicosatetraenoic, allcis-5,8,11,14,17-eicosapentaenoic and allcis-4,7,10,13,16,19-docosahexaenoic acids were indicative of the less ordered forms reported for sodium oleate at elevated temperature. The diffraction data from the less ordered soaps are consistent with the melted form of the hydrocarbon chains of the unsaturated acids at room temperature.

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Abbreviations

Palmitoleic acid:

cis-9-hexadecenoic acid

oleic acid:

cis-9-octadecenoic acid

cis-vaccenic acid:

cis-11-octadecenoic acid

linoleic acid:

cis,cis-9,12-octadecadienoic acid

α-linolenic acid:

cis,cis,cis-9,12,15-octadecatrienoic acid

homo-γ-linolenic acid:

8,11,14-eicosatrienoic acid

elaidic acid:

trans-9-octadecenoic acid

linoelaidic acid:

trans,trans-9,12-octadecadienoic acid

arachidonic acid:

cis,cis,cis,cis-5,8,11,14-eicosatetraenoic acid

erucic acid:

cis-13-docosenoic

eicosapentaenoic acid:

EPA,cis,cis,cis,cis,cis-5,8,11,14,17-eicosapentaenoic acid

docosahexaenoic acid:

DHA,cis,cis,cis,cis,cis,cis-4,7,10,13,16,19-docosahexaenoic acid

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Authors and Affiliations

  1. Miami Valley Laboratories, The Procter and Gamble Company, P.O. Box 398707, 45239-8707, Cincinnati, OH

    R. J. Jandacek & W. B. Broering

Authors
  1. R. J. Jandacek
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  2. W. B. Broering
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Jandacek, R.J., Broering, W.B. X-Ray diffraction study of sodium soaps of monounsaturated and polyunsaturated fatty acids. Lipids 24, 1008–1013 (1989). https://doi.org/10.1007/BF02544070

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  • DOI: https://doi.org/10.1007/BF02544070

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