Chemically, an amino acid is a molecule that has a carboxylic acid group and an amine group that are each attached to a carbon atom called the α carbon. Each of the 20 amino acids has a specific ...

Diagram showing the functionalization of a metal oxide nanoparticle with various organic molecules, including trimethoxysilane, amine, phosphonic acid, carboxylic acid, dopamine, and cysteine. This ...

an 18-carbon saturated fatty acid. The normal numbering system, starting with the carboxylic acid, is shown in blue. The carbons and oxygens of the carboxylic acid functional group are red.