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Determination of nitrogen in vegetable oils
Author(s) -
McGuire T. A.,
Earle F. R.,
Dutton H. J.
Publication year - 1947
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02643516
Subject(s) - kjeldahl method , chemistry , nitrogen , hydrochloric acid , reagent , hydrolysis , sulfuric acid , chromatography , soybean oil , pulp and paper industry , organic chemistry , food science , engineering
Summary Hydrolysis with alcoholic hydrochloric acid quantitatively converts the nitrogen of crude soybean lecithin to a water‐dispersible form. This alcoholic‐acid hydrolysis also converts the nitrogen in large amounts of crude soybean oil to a water‐dispersible form which can then be separated and digested with a minimum amount of sulfuric acid by the Kjeldahl procedure. With careful control of both reagents and blank determinations, as little as 0.1 mg. of nitrogen can be measured with a precision of about 10%. The details of the method are given and it is applied to a series of soybean oils after various treatments and to three kinds of salad oils.