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Journal of Nutrition Vol. 46 No. 1 January 1952, pp. 13-25
Copyright © 1952 by American Society for Nutrition
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Availability of the Essential Amino Acids in Cottonseed Meal1

K. A. Kuiken2 and Mary Trant

Department of Biochemistry and Nutrition, Texas Agricultural Experiment Station, Texas Agricultural and Mechanical College System, College Station

1. The availability of the essential amino acids in cottonseed meal samples which were processed in various ways was determined by a rat feeding method.
2. Marked variation in individual amino acid availability was characteristic of commercial hydraulic cottonseed meal. Lysine and methionine were particularly low, with values of 64 and 67%, respectively. Lysine availability values as high as 85% were obtained with special solvent and gland-free meals.
3. The binding of gossypol as a result of heating cottonseed meal in the presence of either gossypol or pigment glands did not reduce amino acid availabilities appreciably unless cottonseed oil was also present.
4. Heat treatment as severe as autoclaving for one hour at 15 lb. pressure did not reduce the availability of the essential amino acids in cottonseed meal of low oil content.
5. Lysine was more sensitive to heat destruction than the other essential amino acids. About a 10% reduction in lysine content was observed when solvent-processed cottonseed meal was autoclaved at 15 lb. pressure for 60 minutes.

1 Presented, in part, at the 15th annual meeting of the American Institute of Nutrition at Cleveland, Ohio, April, 1951. This investigation was supported, in part, by a grant from the Cotton Research Committee of Texas.

2 Present address: The Buckeye Cotton Oil Company, Cincinnati, Ohio.

Manuscript received 30 July 1951.




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