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The Proteins of Cottonseed Meal¹

I. Amino Acid Content

From the Department of Animal Husbandry, University of Illinois, Urbana

ABSTRACT

I. Introduction

One of the earliest references to the proteins of cottonseed meal was made by Ritthausen (1), who separated the proteins in the form of spheroids. Osborne and Voorhees (2) isolated a protein from cottonseed meal which had the nature of a globulin, being soluble in salt solutions, and comprised 42.3 per cent of the total nitrogen of the meal. Another protein (or proteins) was found to be insoluble in salt solutions but soluble in 0.2 per cent potash solution and amounted to 44.3 per cent of the total nitrogen of the meal. Two per cent of the total nitrogen was present in the form of water soluble proteose.

The distribution of nitrogen in various protein bodies was studied exhaustively by Osborne and Harris (3), who employed the modified Hausmann method (4). The following values are typical of their results.

These investigators state that "This wide variation in the proportion of basic decomposition products of the various proteins ... raises impostant questions regarding their food value."

¹ The results presented in this paper formed part of a thesis submitted to the Graduate School of the University of Illinois in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Animal Husbandry.