Abstract
The following changes have been observed to occur when dl-phenylalanine is exposed to ultraviolet radiant energy:1. Spiegel-Adolf1 reported that solutions of phenylalanine exposed to ultraviolet rays become pigmented. Pigment formation was most marked in neutral solution, but acid and alkaline solutions also became red-brown after prolonged irradiation. During the present investigation, these findings were confirmed. Moreover, when dilute sulfuric acid or hydrochloric acid solutions of the amino acid were exposed to the ultraviolet rays, a small amount of dark brown material precipitated; this material formed colloidal solutions in dilute sodium hydroxide solution, but was insoluble in dilute acid solution. Much of the soluble pigment of the irradiated solutions could be removed by alternate additions of strong sodium hydroxide and sulfuric acid solutions; or by extraction from strongly acid solution with butyl alcohol.2. Irradiated neutral, acid, or alkaline solutions of phenylalanine were found in the p...
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