Effect of Adding the Limiting Amino Acids to an Amino Acid Diet Simulating Rice Protein on the Conversion of Tryptophan to Nicotinamide in Rats.

The effect of amino acid composition on the conversion ratio of tryptophan to nicotinamide was investigated. The ratio in the group fed with an amino acid diet simulating rice protein was around 2.5%. This ratio was statistically decreased by the addition of the limiting amino acids, except for tryptophan, and increased by the addition of all the Limiting amino acids, including tryptophan. The composition of amino acids proved to greatly affect the conversion ratio.