Abstract
Commercial frying practices and frying conditions at 62 restaurants or fast-food outlets were investigated and the quality of their discarded frying oils was evaluated by several standard laboratory methods: total polar components (TPC), free fatty acids (%FFA), p-anisidine and peroxide values, color, viscosity, C18:2/C16:0, absorbance at 232 and 268 nm, and five quick test methods (Foodoil sensor, Oxifrit (RAU-Test), Fritest, Veri-Fry-TAM 150, and Veri-Fry-FFA 500). Frying techniques varied from primitive traditional practice at traditional shops to modern sophisticated frying procedures at some franchise restaurants. Discarded oils appeared to be heat-damaged to a varying extent according to the degree of quality control applied by the corresponding restaurants. Test methods were shown to possess different statistical correlations. Highly significant correlations were found between TPC and Foodoil sensor (c.f=0.93) and between Oxifrit and Fritest (c.f=0.94), each of which were also correlated relatively well to the TPC. Peroxide value followed by %FFA did not significantly (p<0.05) correlate with the TPC. Significant linear relationships (p⊕0.05) were found between the TPC and each of the other indicators but %FFA and peroxide value.
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References
Fritsch, C.W.,J. Am. Oil Chem. Soc. 58:272 (1981).
Artman, N.R.,Advances in Lipid Research, Vol. 7, edited by R. Paoletti, and D. Kritchevsky, Academic Press, New York, NY, 1969.
Billek, G.,Nutr. Metab. 24:200 (1979).
Frankel, E.N., L.M. Smith, C.L. Hamblin, R.K. Creveling and A.J. Cliffored,J. Am. Oil Chem. Soc. 61:87 (1984).
Perrin, J.L., Docteur Ingenieur, thesis, University of Marseille, Marseille, France, 1984.
Sebedio, J.L., A. Grandgirard, J. Prevost and Ch. Septier,J. Am. Oil Chem. Soc. 63:467 (1986).
Sebedio, J.L., A. Grandgirard and J. Prevost, Ibid.:362 (1988).
Augustin, M.A., T. Asap and L.K. Heng, Ibid.:1670 (1987).
Rojo, J.A., and E.G. Perkins, Ibid.:414 (1987).
Billek, G., G. Guhr, and J. Waibel, Ibid.:728 (1978).
Official and Tentative Methods of the American Oil Chemists’ Society, 3rd edn., American Oil Chemists’ Society, Champaign, IL, 1974.
Standard Methods for the Analysis of Oils, Fats and Derivatives, IUPAC, Applied Chemical Commission on Oils, Fats and Derivatives, 6th edn., edited by C. Paquot, Pergamon Press, New York, NY, 1979.
Peled, M., T. Gutfinger and A. Laten,J. Sci. Food Agric. 26:1655 (1975).
Yoon, S.H., S.K. Kim, K.H. Kim and W.T. Kwon,J. Am. Oil Chem. Soc. 64:870 (1987).
Fritsch, C.W., D.C. Egberg and J.S. Magnuson, Ibid.:756 (1979).
Landers, R.E., and D.M. Rathmann, Ibid.:255 (1981).
Defouw, C.L., M.E. Zabak and J.I. Gray,J. Food Sci. 46:452 (1981).
Metcalf, L.C., A.A. Schmitz and J.R. Pelca,Anal. Analyt. Chem. 38:514 (1966).
Graziano, V.J.,Food Technol. 33:50 (1979).
Croon, L.B., A. Rogstad, T. Leth and T. Kiutamo,Fette Seifen Anstrichmittel 88:87 (1986).
Blumenthal, M.M., J.R. Stockler, and P.J. Summers,J. Am. Oil Chem. Soc. 62:1373 (1985).
Steel, R.C.D., and J.H. Torrie,Principles and Procedures of Statistics, McGraw-Hill Book Company, New York, NY, 1980.
SAS, SAS User’s Guide: Statistics, SAS Institute, Inc., Cary, NC, 1982.
Usuki, R., T. Suzuki, Y. Endo and T. Kandea,J. Am. Oil Chem. Soc. 61:785 (1984).
Paradis, A.J., and W.W. Nawar,J. Food Sci. 46:449 (1981).
Defielliettaz-Goethart, R.L., H. Hoekman and E.J. Sinkeldam,Voeding-Jaargang 46:300 (1985).
Okly, D.A., and O.L. Oke,Food Chem. 14:251 (1984).
Roth, H., and S.P. Rock,Baker’s Digest 46:38 (1972).
Augustin, M.A., and S.K. Berry,J. Am. Oil Chem. Soc. 61:873 (1984).
Carlson, B.L., and M.H. Tabacci, Ibid.:218 (1986).
Berger, K.G., PORIM Technology: Palm Oil Res. Inst. Malaysia, Kuala Lumpur, Malaysia,The Practice of Frying, No. 9 (May 1984).
Stevenson, S.G., M. Vaisey-Genser and N.A.M. Eskin,J. Am. Oil Chem. Soc. 61:1102 (1984).
Lee, C.H.,Symposium on Foods: Lipids and Their Oxidation, edited by H.Z. Schultz, E.A. Day and R.O. Sinnhuber, Avi Publishing Co. Westport, CT, 1962.
Okly, D.A., and O.L. Oke,Food Chem. 21:161 (1986).
Bessler, T.R., and F.T. Orthoefer,J. Am. Oil Chem. Soc. 60:1765 (1983).
Gere, A.,J. Ernahrungseiss 21:191 (1982).
Peers, K., and P.A.T. Swoboda,J. Sci. Food Agric. 33:389 (1982).
Noor, N., and M.A. Augustin, Ibid.:805 (1984).
Rossell, J.B., and D. Phil,The British Food Manufacturing Industries Research Association 47:9 (1986).
Rocks, S.P.J. Am. Oil Chem. Soc. 41:228 (1964).
Guhr, G., C. Gertz, J. Waibel and M. Arens,Fette Seifen Anstrichmittel 83:373 (1981).
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Al-Kahtani, H.A. Survey of quality of used frying oils from restaurants. J Am Oil Chem Soc 68, 857–862 (1991). https://doi.org/10.1007/BF02660602
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DOI: https://doi.org/10.1007/BF02660602