Keywords S-adenosyl-L-methionine;Saccharomyce cerevisiae;ultraviolation mutation;optimizing culture conditions;fermentation with high cell density;separation &purification;

• 腺苷-L-甲硫氨酸;酿酒酵母;紫外线诱变;培养条件优化;高密度发酵培养;分离纯化;