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Tocopherol concentrates by the fractional crystallization of cottonseed oil from solvents

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Oil & Soap

Summary

1. Tocopherol concentrates equivalent in tocopherol content and antioxygenic activity to molecularly distilled concentrates, have been obtained from cottonseed oil by hydrogenating the oil and removing the bulk of the glycerides and sterols by low temperature crystallization from acetone.

2. High-tocopherol concentrates can be obtained only from hydrogenated oils. Completely hydrogenated oils are the best source of concentrates at crystallization temperatures down to −60° C.; below this temperature partially hydrogenated oils are equally as good.

3. A solvent-oil ratio of 8:1 by weight appears to be about the optimum. At this ratio, crystallization from acetone at the temperature of Dry Ice (−78° C.) yields a concentrate containing 34 percent tocopherols from an oil originally containing 0.05 percent tocopherols.

4. The direct addition of Dry Ice to the solvent and oil is to be avoided, since this lowers the recovery of tocopherols.

5. Petroleum naphtha and methyl ethyl ketone are less suitable solvents than acetone, because of their greater capacity for dissolving glycerides at low temperatures.

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References

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Author information

Authors and Affiliations

  1. Southern Regional Research Laboratory, New Orleans, Louisiana

    W. S. Singleton & A. E. Bailey

Authors
  1. W. S. Singleton
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  2. A. E. Bailey
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Additional information

Presented before the American Oil Chemists’ Society Meeting, New Orleans, Louisiana, May 10 to 12, 1944.

This is one of four regional research laboratories operated by the Bureau of Agricultural and Industrial Chemistry, Agricultural Research Administration, U. S. Department of Agriculture.

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Singleton, W.S., Bailey, A.E. Tocopherol concentrates by the fractional crystallization of cottonseed oil from solvents. Oil Soap 21, 224–226 (1944). https://doi.org/10.1007/BF02544191

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  • DOI: https://doi.org/10.1007/BF02544191

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