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Reaction mechanics of sodium methoxide treatment of lard
Author(s) -
Weiss Theodore J.,
Jacobson Glen A.,
Wiedermann Lars H.
Publication year - 1961
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/bf02637971
Subject(s) - sodium methoxide , interesterified fat , chemistry , melting point , catalysis , cooling curve , methoxide , glyceride , sodium , fatty acid , organic chemistry , materials science , lipase , metallurgy , enzyme
Lard was treated at several temperatures with sodium methoxide catalyst. Samples were taken frequently during the course of the reaction and were subjected to measurements of glyceride distribution, especially the trisaturated triglyceride fraction, in terms of melting point, cooling curve, aniline point, and x‐ray diffraction pattern. The over‐all reaction could be broken down into several phases. Catalyst Formation. The sodium methoxide reacts with a fat to form an active catalyst. Infrared spectra show the formation of beta ‐keto esters during the reaction, probably intermediates in the ester‐ester interchange. Crystal Modification. This phase is characterized by a complete and permanent change in crystal structure with a simultaneous loss of GS 2 U peak in the cooling curve. The GS 3 content is only slightly increased from the original lard at this point. IV, etc. Interesterification. During these phases the fatty acids of the triglycerides approach random distribution. Intra‐esterification occurs simultaneously but at a different rate. These phases are distinguishable from each other by their apparent GS 3 contents, which increase beyond that of phase II.