Summary
Glassware cleaned with a synthetic detergent instead of hot or cold chromic-sulfuric acid leads to improved reproducibility of the stability of fats and oils determined by the active oxygen method. When the glassware used in this method is cleaned with hot chromic-sulfuric acid, chromium compounds are absorbed within the glass walls and subsequently diffuse into the oil or fat thereby leading to erratic results. A method is described for cleaning the glassware used with the fat stability method which has given reliable results in the hands of the authors for more than a year, during which it has been in almost daily use.
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References
King, A. E., Roschon, H. L., and Irwin, W. H., Oil and Soap,10, 105–109 (1933).
Committee on Analysis of Commercial Fats and Oils, Ind. Eng. Chem., Anal. Ed.,17, 336–340 (1945).
Laug, E. P., Ind. Eng. Chem., Anal. Ed.,6, 111–112 (1934).
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One of the laboratories of the Bureau of Agricultural and Industrial Chemistry, Agricultural Research Administration, U. S. Department of Agriculture.
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Fore, S.P., Moore, R.N. & Bickford, W.G. Improved procedure for cleaning glassware used in determining the stability of fats and oils by the active oxygen method. J Am Oil Chem Soc 28, 73–74 (1951). https://doi.org/10.1007/BF02612096
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DOI: https://doi.org/10.1007/BF02612096