Comparison of Characteristics of Product of Reaction and Poly-L-Phenylalanine

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  • * The product was said to be insoluble if <0.002 gm of product was soluble in 100 ml of solvent at 24 °. Extractions were performed by adding 0.5 mg of authentic poly-L-phenylalanine and the C14-product of a reaction mixture (1800 counts/min) to 5.0 ml of solvent. The suspensions were vigorously shaken for 30 min at 24 ° and were centrifuged. The precipitates were plated and their radioactivity was determined.