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Relationship of Intracellular Proteins and Muscle Pigments to the Tenderness of Bovine Muscles^1,2,

Louisiana State University, Baton Rouge

Abstract

The l. dorsi muscles from 12 yearling steers, classified as tender and less tender on the basis of Warner-Bratzler shear values, were utilized in this study. The sarcoplasmic and myofibrillar proteins were extracted. Fibrillar proteins were further fractionated by ionic strength dilution. Total pigments and iron content were also determined. Less tender muscles tended to have lower quantities of soluble myofibrillar protein, however, differences were not statistically significant. No differences were found in sarcoplasmic protein. The combined fractions insoluble at 0.5 and 0.2 M KC1 were significantly greater in the tender muscles. The water extracts from the tender muscles had a significantly lower total pigment and iron content than that from the less tender group.

¹ Published with the approval of the Director, Louisiana State University, Agricultural Experiment Station, Baton Rouge.

² This work was supported by a contract with the U. S. Department of Agriculture and authorized by the Research and Marketing Act of 1946. The contract was supervised by the Eastern Utilization Research and Development Division of the Agricultural Research Service.

³ Present address: U.S.D.A., A.R.S., Human Nutrition Research Division. Beltsville. Maryland 20705.