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The bleaching of soybean oil. A spectrophotometric evaluation

  • Technical
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Journal of the American Oil Chemists Society

Summary

Bleaching results are evaluated spectrophotometrically by measuring the change in the absorbances at 455 and 670 (or 665) millimicrons, respectively. Three bleaching clays (one was activated) and two activated carbons were used for decolorizing soybean oils made break-free by either alkali refining or acetic anhydride water degumming. Bleaching times varied from 10 to 40 min. with 30 min. being used in the evaluations. Although bleaching at a temperature of 265°F. removed more color than bleaching at 125° or 220°F., the latter temperature was used in this study. Most of the bleaching was done under vacuum although using a nitrogen pressure of 50 p.s.i.g. removed more color. Results are expressed by Freundlich isotherms, and a bleaching chart for the control of plant bleaching is given. It is shown that in the bleaching of soybean oil primary consideration should be given to the removal of green pigment.

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Author information

Authors and Affiliations

  1. James Millikin University, Decatur, Illinois

    M. R. Armstrong

  2. A. E. Staley Manufacturing Company, Decatur, Illinois

    C. E. Ireland

Authors
  1. M. R. Armstrong
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  2. C. E. Ireland
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Additional information

Now with E. I. du Pont de Nemours Company Inc., Kinston, N. C.

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Armstrong, M.R., Ireland, C.E. The bleaching of soybean oil. A spectrophotometric evaluation. J Am Oil Chem Soc 35, 425–428 (1958). https://doi.org/10.1007/BF02632562

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  • DOI: https://doi.org/10.1007/BF02632562

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