What does aspartate mean?
Aspartate is the name given to the ionized form of aspartic acid, one of the twenty standard amino acids that make up proteins. Chemically speaking, an aspartate is either a salt or an ester formed when aspartic acid loses a proton; in living organisms, where bodily fluids are near neutral pH, most aspartic acid exists in this deprotonated aspartate state. The term appears constantly in biochemistry and medicine: blood panels report levels of aspartate aminotransferase (AST), an enzyme central to amino-acid metabolism and a common marker of liver health, while nutritional supplements frequently bind minerals such as zinc or magnesium to aspartate to aid absorption. Aspartate also functions as an excitatory signaling molecule in the nervous system, though glutamate plays the more prominent role there. Though technical in register, the word surfaces in everyday contexts like laboratory reports and ingredient lists, making it worth recognizing even outside the laboratory.
nounAspartate is a salt or ester of aspartic acid, an amino acid found in many proteins. In biochemistry, it refers to the ionized (deprotonated) form of aspartic acid that occurs at physiological pH.
- A salt or ester of aspartic acid.
- The negatively charged ionized form of aspartic acid present at physiological pH, particularly as a protein side chain or neurotransmitter-related species.
"The enzyme's active site binds the negatively charged aspartate residue, positioning the substrate for catalysis."
"Blood tests often measure aspartate aminotransferase (AST), an enzyme named for its role in transferring amino groups to and from aspartate."
"Mineral supplements sometimes pair magnesium with aspartate to improve absorption in the digestive tract."
Pluralizes regularly when referring to multiple distinct aspartate compounds or ions.
"Several different aspartates are used as mineral supplements, including zinc and potassium aspartates."
Your body runs on it: every nerve signal in your brain relies partly on aspartate, one of the twenty amino acids your proteins are built from — and it also gives artificial sweeteners like aspartame half their name.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of aspartate
Aspartate derives from aspartic acid, which was first isolated in the early nineteenth century from asparagus juice, itself named after the plant. The word traces back through New Latin 'asparagus' to Greek 'aspharagos' (or 'asparagos'), the classical term for asparagus. The '-ate' suffix is the standard English chemical ending denoting salts and esters of acids, so aspartate literally means 'the aspartic-acid-derived compound'. Related forms include aspartyl, referring to the acyl group derived from aspartic acid within proteins.
Related word forms
How aspartate is actually used
Aspartate is primarily a technical term used in biochemistry, medicine, and nutrition. It is rarely encountered in everyday speech except in the context of lab results (as AST) or supplement labels. The word is always lowercase in scientific prose and is typically treated as countable when referring to chemical compounds.
Easily confused with aspartate
Aspartame is an artificial sweetener made from two amino acids, whereas aspartate is simply the ionized form of the amino acid aspartic acid.