What does eluate mean?
In laboratory science, the eluate is the liquid that flows out of a chromatography column or similar device after a solvent has been passed through it to wash out dissolved substances. When chemists separate a mixture — say, pigments in plant extract or proteins in blood serum — they introduce a solvent called the eluent into the column; whatever emerges from the far end, now carrying the separated compounds, is the eluate. By collecting the eluate in fractions and analyzing each one, researchers can isolate and identify individual components with great precision. The word derives from the Latin elutus, past participle of eluere, meaning 'to wash out,' which also gives us related terms such as elute, elution, and eluent. Though unfamiliar outside scientific circles, the eluate is central to countless everyday applications, from pharmaceutical purification and environmental testing to forensic analysis, making it one of the quiet workhorses of modern analytical chemistry.
nounIn chemistry, the liquid solution that emerges from a chromatography column or other separation apparatus after having washed out (eluted) one or more dissolved substances; more broadly, any solution produced by the process of elution.
- The liquid that has passed through a chromatographic column or adsorbent bed, containing the substances washed out of it.
- More generally, any solution resulting from washing or extracting material by percolating a solvent.
"The chemist collected each fraction of the eluate in separate tubes for analysis."
"Fractions of the eluate were collected at five-minute intervals throughout the run."
"The radioactive tracer appeared in the third portion of the eluate."
The plural is regular but rare; in practice, chemists usually speak of collecting multiple 'fractions of the eluate' rather than several eluates.
"The two eluates from the parallel columns were compared by mass spectrometry."
Every time a lab purifies a drug, tests water quality, or analyzes blood, someone is carefully collecting the 'eluate' — the precious washout that carries the answers.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of eluate
Eluate comes from the Latin verb eluere, 'to wash out,' formed from e- ('out') plus luere, 'to wash' (the same root behind lavare, whence 'lavatory' and 'lotion'). The word was coined in the nineteenth century alongside its siblings elute and elution as analytical chemistry developed systematic methods for washing substances out of adsorbent materials. It shares this Latin washing root with dilute, ablution, and alluvial, among others.
Related word forms
How eluate is actually used
A technical term used almost exclusively in laboratory chemistry, particularly chromatography and ion-exchange work. It belongs to formal scientific writing rather than everyday English.
Easily confused with eluate
The eluent is the solvent introduced into the column to wash substances out, while the eluate is what actually comes out of the column carrying those dissolved substances.
Elute is the verb meaning to wash out or extract a substance by dissolving it, whereas eluate is the noun naming the resulting solution.
Filtrate is the liquid that has passed through a filter, while eluate specifically refers to liquid obtained by eluting (washing out) substances from an adsorbent material.