What does butyrate mean?
Butyrate is the name given to the salts and esters of butyric acid, a four-carbon fatty acid first identified in rancid butter — indeed, the word traces back through Latin butyrum to Greek boutyron, meaning butter. In modern usage the term belongs almost entirely to chemistry and the life sciences. Chemists may speak of compounds such as sodium butyrate or methyl butyrate, while biochemists and nutrition researchers reserve special attention for the butyrate ion itself, a short-chain fatty acid generated when gut bacteria ferment dietary fibre in the colon. There it serves as the principal energy source for the cells lining the intestinal wall and has been linked in research to gut health and anti-inflammatory effects. Though rarely heard outside scientific contexts, butyrate appears frequently in popular health journalism about the microbiome, making it a useful term for anyone reading seriously about diet and digestion.
nounA salt or ester of butyric acid; in biochemistry, the anion CH₃CH₂CH₂COO⁻, notable for its role as a beneficial short-chain fatty acid produced by gut bacteria during fiber fermentation.
- Chemistry: a salt or ester of butyric acid (e.g. sodium butyrate).
- Biochemistry: the butyrate anion, a short-chain fatty acid produced by microbial fermentation of fibre in the colon and a key energy source for colonic cells.
"The fermentation of dietary fibre in the colon releases butyrate, which nourishes the cells lining the intestinal wall."
"Sodium butyrate is widely used in laboratory research to study gene expression."
"Diets rich in fermentable fibre increase butyrate levels in the large intestine."
The plural is used only when referring to several distinct butyrate compounds (e.g., sodium butyrate and ethyl butyrate); the singular covers the anion in most biochemical contexts.
"Various butyrates are used industrially as flavouring agents because of their fruity aromas."
Butyrate, made by the bacteria in your gut when you eat fibre, is literally the fuel that keeps the walls of your colon alive — and it's chemically kin to the compound that makes stale butter stink.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of butyrate
Butyrate derives from butyric acid, whose name comes from Latin butyrum, meaning butter, itself borrowed from Greek boutyron. The term reflects the fact that butyric acid was first isolated from rancid butter and gives the substance its characteristic odour. Related coinages include butyric (the adjective form) and butane, named from the same root by chemists classifying hydrocarbons.
Related word forms
How butyrate is actually used
Butyrate is a technical term confined chiefly to chemistry, biochemistry, nutrition science, and medicine. It is not used in everyday conversation; general audiences are more likely to encounter it in health writing about gut bacteria and dietary fibre. The plural refers to multiple distinct compounds rather than multiple instances of one substance.
Easily confused with butyrate
Butyric acid is the free carboxylic acid responsible for rancid butter's smell, whereas butyrate is its deprotonated salt or ester form.