Availability of Amino Acids to Microorganisms II. A Rapid Microbial Method of Determining Protein Value

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Abstract
A rapid method for determining the nutritive value of the proteins of processed cottonseeds has been developed by making a microbiological assay, using an enzymatic digest of the meal as the only source of protein in the medium. The method is based on the observation that the sum of the available amino acids determines the amount of growth of the microorganism. Since no amino acids are used in the basal medium, the method is relatively inexpensive and results can be obtained in a short time.