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Variations in the Chemical and Physical Properties of Three Bovine Lipid Depots¹

University of Wisconsin, Madison

Abstract

Determinations of melting point, iodine number and refractive index were made on extracted lipids obtained from the inner and outer subcutaneous adipose tissue depots and the intramuscular tissue located at two anatomical locations dorsal to the vertebral column. Samples were obtained from bovine carcasses varying widely in the amount of visual intramuscular fat exhibited in the longissimus dorsi at the 12–13th thoracic vertebrae. No significant difference was detected between the two anatomical positions (12–13th thoracic and 4–5th lumbar vertebrae) for any of the characteristics evaluated. However, differences were noted among the three depots. Iodine number and melting point values did not differ for lipid obtained from the intramuscular and inner subcutaneous depots, but they were different from the values obtained for the outer subcutaneous depots. Refractive index values for lipid obtained from the two adipose tissue depots were not significantly different; however, they did differ from the values obtained for the intramuscular lipid.

¹ Supported in part by the Research Committee of the Graduate School with funds supplied by the Wisconsin Alumni Research Foundation.

² Present address: Department of Animal Husbandry, University of Sydney, Camden, N.S.W., Australia.

³ Department of Meat and Animal Science.

⁴ Department of Dairy and Food Industries.