L-Tryptophan

White to light yellow crystal or crystal power, odor less, taste slight bitter. Slightly soluble in water, very slightly soluble in ethanol, insoluble in chloroform, easy to dissolve in the formic acid, dissolve in dilute sodium hydroxide solution and diluted hydrochloric acid. Its fusion point is 289 � . If illuminated for a long time, it will be colored.adding in the poultry feed, it can improve animal's feed intake, weaken stress reaction, improve animal's sleeping, increase fetus and young animal's antibody, improve milk secretion, reduce the amount of high protein ration and save feed cost.