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Intramuscular Lipids and Triglyceride Structures in Range and Feedlot Steers
Author(s) -
MILLER G. J.,
MASOR M. L.,
RILEY M. L.
Publication year - 1981
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1981.tb04166.x
Subject(s) - feedlot , intramuscular fat , triglyceride , polyunsaturated fatty acid , chemistry , zoology , pentadecanoic acid , fatty acid , food science , biochemistry , cholesterol , biology
Longissimus muscle of feedlot steers contained less moisture and more triglycerides (TG) but similar amounts of cholesterol and lipid phosphorus when compared to muscle of range steers. A 100‐g portion of the muscle from feedlot steers provided more of all fatty acids analyzed except iso‐ and anteiso‐tridecanoic and pentadecanoic acids (br 13:0, br 15:0) and octadecatrienoic acid (18:3). Structures of the intramuscular TG were not influenced by dietary treatment. Medium chain saturated acids (10:0 to 15:0) were distributed throughout all 3 positions, 16:0 predominated in the sn ‐1 position, 18:0 and 20:0 in the sn ‐1 and sn ‐3 positions. Br 13:0 and br 15:0 predominated in the sn ‐2 position and were essentially absent from the sn ‐3 position. Monounsaturated acids, with the exception of trans octadecenoic acid ( trans 18:1), were found mainly in the sn ‐2 and sn ‐3 positions. Trans 18:1 predominated in the sn ‐1 and sn ‐3 positions thereby resembling a long chain saturated acid, Octadecadienoic acid (18:2) and 18:3 were about equally divided between positions sn ‐2 and sn ‐3. Tram 18:1 comprised 1.9 and 1.3% of total intramuscular fatty acids from range and feedlot steers, respectively. The structures of intramuscular TG, with respect to 18:2 and saturated acids, did not resemble those of native peanut oil which has been reported to be more atherogenic than randomized peanut oil.