An example: Internal dehydration of o -aminophenylethanal, a nucleophilic attack reaction of nitrogen on the carbonyl carbon:
β -indolylalanine
Essential amino acid. Occurs at 1% in human proteins. Is precursor of serotonin (neurotransmitter that regulates our mood, our eating behavior and prepares us to sleep) which is formed from tryptophan by - Hydroxylation (1) - Decarboxylation (2)
Serotonin
3-methylindole
Formed from tryptophan in the putrefaction of proteins. Is primarily responsible for the unpleasant odor of feces, whereas at low concentration, it contributes to the pleasant scent of jasmine and orange blossom!.
β -indolylethanoc acid
Is formed from tryptophan. This is a multiple-acting plant growth hormone (bud, root, leaf blade, phototropism).
Indigo is a blue-violet dye.
The precursor of indigo, the Indican is extracted from certain plants such as Indigofera Tintoria
Preparation: 1) Hydrolysis of indican:
2) Oxidation of indoxyl
An ancient method practiced in India was to ferment the leaves of Indigofera tinctoria containing indican in basins dug into the moist soil, then collect the yellowish liquid containing indoxyl and beat to oxidize by the air. Indigo formed was deposited at the bottom.
Application:
