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Sesame Oil. IV. Determination of free and bound sesamol

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Journal of the American Oil Chemists Society

Summary

The Villavecchia test was adapted for the quantitative determination of sesamol in sesame oil. Of the several aromatic aldehydes tested, furfural, in the presence of aqueous sulfuric acid (sp. gr. 1.37 at 15°C.), proved to be the most suitable for the quantitative measurement of the color produced with sesamol.

The oil, dissolved in iso-octane (10 g. per 100 ml.), is shaken with dilute aqueous-alcoholic potassium hydroxide to remove the free, but not the bound sesamol. The modified Villavecchia test is applied to a) the original iso-octane solution of the oil, b) the iso-octane solution after extraction with alkali, and/or c) the aqueous-alcoholic extract. The optical densities, read at a wavelength of 518 mμ, correspond to the total bound, and free sesamol, respectively.

The method was applied to the determination of free, bound, and total sesamol in a number of crude, refined, bleached, and deodorized sesame oils. Agreement between the values for total and free plus bound sesamol was close. Four crude sesame oils of different origins had total contents of sesamol ranging from 0.13 to 0.17%, of which nearly all was in the bound form. The yields of added sesamol varied from 95 to 106%.

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References

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Author information

Authors and Affiliations

  1. Southern Regional Research Laboratory, 19, New Orleans, Louisiana

    Pierre Budowski, R. T. O'Connor & E. T. Field

Authors
  1. Pierre Budowski
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  2. R. T. O'Connor
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  3. E. T. Field
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Additional information

Rockefeller Foundation Fellow from the Ministerio de Agricultura y Cria, Division de Quimica, El Valle, D. F., Venezuela.

One of the laboratories of the Bureau of Agricultural and Industrial Chemistry, Agricultural Research Administration, U. S. Department of Agriculture.

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Budowski, P., O'Connor, R.T. & Field, E.T. Sesame Oil. IV. Determination of free and bound sesamol. J Am Oil Chem Soc 27, 307–310 (1950). https://doi.org/10.1007/BF02649317

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  • DOI: https://doi.org/10.1007/BF02649317

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