Tryptophan, also known as β - indolyl alanine, chemical formula C11H12N2O2, is one of the essential amino acids for human body. The appearance is white or yellowish crystal or crystalline powder, odorless, slightly bitter taste. It is slightly soluble in water, slightly soluble in ethanol, insoluble in chloroform, easily soluble in formic acid, and soluble in ... or dilute hydrochloric acid. Tryptophan is an important precursor of auxin biosynthesis in plants. Its structure is similar to that of IAA, and it is ubiquitous in higher plants. It is also the precursor of 5-hydroxytryptamine, an important neurotransmitter in human body

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