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D-Tryptophan (English D(+)-Tryptophan) is a white or off-white to slightly yellow crystalline powder at room temperature. It is odorless or slightly odorless and has a slightly sweet taste. Solubility in water is 1.14g (25ºC), soluble in dilute acid and dilute alkali, stable in alkali, decomposed in strong acid, and plays an important role in the growth and metabolism of humans and animals. It is called the second essential amino acid, and L The physical and chemical properties of -types are almost the same, only the optical rotation is opposite, but their distribution, functions and coenzymes are diverse, and the melting point is very high, generally above 200 degrees, soluble in water, and absorbs light in the near ultraviolet region. Ability.