Isolation of a New Sulfur-containing Amino Acid (lanthionine) from Sodium Carbonate-treated Wool

Subsequent attempts, however, on their part to isolate the compound were unsuccessful. As the quantity of our selenium-sulfur compound was small, and the supply of the source material was exhausted and could not be replenished for several weeks, it was decided that in the meantime it would be worth while to repeat the work of Kiister and Irion with the hope of isolating the thio ether from wool. Familiarity gained with its properties should be of value later when our work on the analogous selenium-sulfur compound is resumed. Several attempts to isolate the thio ether by carefully following