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A study of the cause of rapid color development of heated refined palm oil

  • Technical
  • Published:
Journal of the American Oil Chemists Society

Abstract

One of the most obvious changes when oils are heated is color darkening. Palm oil darkens very rapidly compared to other oils. The cause of this rapid color development was investigated. Various methods used to pretreat Lotox crude palm oil (CPO) to retard darkening during heating were by agitation with activated carbon S511, by water and water/isopropyl alcohol (95:5) washing of neutralized and unneutralized oil, and by liquid/liquid extraction of oil using water and water/isopropyl (95:5). Pretreatment of CPO did succeed in retarding color development. Retardation was especially evident in oils previously neutralized with sodium hydroxide before washing with water and water/isopropyl alcohol. The UV spectra of the liquid/liquid extracts showed strong absorption maxima at 256 nm. The addition of a base resulted in darkening of the extracts accompanied by shifts to longer wavelengths (288 nm). Reaction with freshly diluted 1–2% ferric chloride solution gave a brown color. The development of paper chromatography in butanol: acetic acid:water (6:1:2) revealed a blue fluorescence near the solvent front, with the same relative retention time as that of tannic acid. This evidence indicates that phenolic compounds were responsible for color darkening in palm oil.

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References

  1. Mattil, K.F., F.A. Norris, A.J. Stirton and D. Swern, in Bailey’s Industrial Oil and Fat Products, 3rd Edition, Swern, D., ed., John Wiley and Sons, New York (1964).

    Google Scholar 

  2. Goulombic, C., JOACS 64:2337 (1942).

    Article  Google Scholar 

  3. King, R.R., and F.W. Wharton, JOACS, 26:201 (1949).

    Article  CAS  Google Scholar 

  4. Fraser, M.S., and G. Frankl, JAOCS 58:926 (1981).

    Article  CAS  Google Scholar 

  5. Mukai, A., I. Yamamoto and S. Ohta, J. Jap. Oil Chem. Soc. 14(6):292 (1965).

    CAS  Google Scholar 

  6. Roth, H., and S.P. Rock, Bakers’ Dig. 46(4):38–45, 66–67; 46(4):38–40, 42–44 (1972).

    Google Scholar 

  7. Boey, P.L., in Palm Oil Fractionation and Carotene Extraction, A thesis submitted to Universiti Sains Malaysia for the degree of Doctor of Philosophy, April 1978.

  8. Rice, R.D., in Third Revision of SCOPA Palm Oil Bleachability Test, Marfleet Refining Co. Ltd., July 1980.

  9. Lantz, C.W., and G.T. Carlin, Oil and Soap 15:38 (1938).

    Article  CAS  Google Scholar 

  10. Pike, M., in Growth in Importance of Palm Oil in the 1970’s, Hamilton, R.J., and A. Bhati, eds., Applied Science Publishers Ltd. London.

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Authors and Affiliations

  1. Palm Oil Research Institute of Malaysia, No. 6, Persiaran Institusi B.B. Bangi, P.O. Box 10620, Selangor, Malaysia

    Y. A. Tan, S. H. Ong, K. G. Berger, H. H. Oon & B. L. Poh

Authors
  1. Y. A. Tan
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  2. S. H. Ong
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  3. K. G. Berger
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  4. H. H. Oon
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  5. B. L. Poh
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Tan, Y.A., Ong, S.H., Berger, K.G. et al. A study of the cause of rapid color development of heated refined palm oil. J Am Oil Chem Soc 62, 999–1006 (1985). https://doi.org/10.1007/BF02935701

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  • DOI: https://doi.org/10.1007/BF02935701

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