ÄProblemÜ The matter to be solved is to provide a method by which cysteine is efficiently prepared from gamma -glutamylcysteine and also to provide an excellent method for the manufacture of a food material containing a high amount of cysteine from yeast extract. <；??>；ÄSolutionÜ A method for the manufacture of a food material containing a high amount of cysteine, characterized in that, a yeast extract is prepared from yeast cells containing gamma -glutamylcysteine, the extract is concentrated by controlling at the temperature of as low as not higher than 60 DEG C to prepare a food material in a liquid form where the solid concentration is not less than 10% and the food material is kept at 70 to 130 DEG C.
