Amino acid dating
type of dating
Amino acid dating or racemization dating is a dating technique used to estimate the age of a specimen in paleobiology, molecular paleontology, archaeology, forensic science, taphonomy, sedimentary geology and other fields. This technique relates changes in amino acid molecules to the time elapsed since they were formed.
Background
Chemistry
Amino acids are a set of organic compounds that are used by living organisms to synthesise proteins. All amino acids (except glycine) have one or more pairs of stereoisomers, isomers which share the same bond order but are organized differently in 3D space. A given pair of stereoisomers that are optically active and non-superimposable mirror images of each other are called enantiomers; pairs that are not mirror images are diastereomers or epimers. Stereoisomers of the same molecule may undergo reactions (known as racemization or epimerization respective to the type of stereoisomer pair involved) that convert them to other stereoisomers.
Biological systems are stereoselective, preferring certain stereoisomers for chemical reactions; living organisms keep all their amino acids in their "left-handed" (L or levo-) forms (a state called homochirality) because they are unable to use the "right-handed" (D or dextro-) forms for protein synthesis.
When an organism becomes unable to keep its amino acids in that unbalanced ratio, such as by dying or shedding tissue, the system will proceed towards chemical equilibrium. Measuring the progress of this interconversion reaction
allows estimation of an organism's time of death, if environmental variables like moisture and temperature are accounted for.
Amino acid properties and environmental conditions
Amino acids commonly used for amino acid dating analysis are leucine, aspartic acid, valine, glutamic acid, and diastereomer isoleucine.
The public source identifies “Amino acid dating” as type of dating. This brief keeps that definition visible, then builds a research path around Amino, acid and dating.
Why this record matters
A short description can identify a subject without explaining its stakes. For “Amino acid dating”, the useful work is to connect “type of dating” to the records capable of establishing context and consequence.
Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Sep 18, 2026. The linked authority identifier is Q471770. None of the 0 selected statements returned an explicit reference.
The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
- Subject orientation
- Search vocabulary
- Locating named sources
The closest primary source, responsible institution and strongest cited specialist reference.
Three-step research path
- Establish the record: confirm the title “Amino acid dating”, its source revision and the description used here.
- Expand the search: follow Amino acid dating primary sources, Amino acid dating archive and Amino research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Amino acid dating”?
- Which institution is responsible for the underlying evidence?
- What terminology or title could unlock a more precise catalogue search?
Search terms from this dossier
This entry incorporates text from “Amino acid dating” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.