L-threonic acid
Enable an agent to recognise L-threonic acid, assess the identity and condition of a sample, and determine its suitability for a specified chemical or analytical use.
Bundle → Layer → Finding → Questions Filled
6 bundles · 11 layers · 16 findings · 26 questions
Molecular and stereochemical identity Establish which chemical entity the name and sample represent.
Structure and identifiers
Anchor the registry entry to an explicitly stereochemical structure.
Identity record concordance
Require names and external identifiers to resolve to the same free-acid structure.
- Does the record specify (2R,3S)-2,3,4-trihydroxybutanoic acid with both stereocentres resolved? definition
- Which inspected records support the CAS, PubChem, ChEBI and any EC identifier, and do their structures agree? provenance
Stereoisomer and name boundaries
Separate L-threonic acid from stereoisomers and similarly named compounds.
Stereochemical discrimination
Specify evidence sufficient to distinguish this stereoisomer from chemically similar candidates.
- Which measurement distinguishes the sample from D-threonic acid and erythronic stereoisomers? measurement
- What evidence excludes L-threonine, L-threose or an unspecified threonic-acid mixture despite similar labelling? boundary
Free acid and solution speciation Describe how protonation and counterions affect the material being recorded.
Protonation in solution
Record solution conditions and distinguish analytical total from individual species.
Acid-base state
Represent protonation using measured conditions and an appropriately supported equilibrium model.
- What are the solution pH, temperature, total concentration and ionic strength? measurement
- Which experimentally supported dissociation constant applies under those conditions? provenance
Counterions and quantity basis
Keep neutralised material and acid-equivalent reporting explicit.
Salt boundary and conversion
Identify counterions and prevent ambiguous conversion between salt mass and acid content.
- Are counterions present, and does the supplied material require a linked salt identity? boundary
- Is the reported quantity free-acid mass, threonate amount or acid equivalents, and what composition supports its conversion? measurement
Sample quality and analytical evidence Determine how much verified L-threonic acid a sample contains.
Assay and impurities
Account for acid content, moisture, residual solvents and other components.
Composition on a defined basis
Express sample composition with a method, uncertainty and explicit denominator.
- What is the L-threonic acid assay on as-received and, where justified, dry bases? measurement
- Which stereoisomers, counterions, water, solvents and other impurities were measured rather than assumed absent? measurement
Method selectivity and reference
Connect analytical conclusions to selectivity and a traceable reference material.
Supported identification and quantification
Separate evidence of molecular composition from evidence of stereochemistry and concentration.
- Can the analytical method resolve relevant stereoisomers and matrix interferences, or does it measure combined species? measurement
- Which reference material, calibration and identity records support the reported result? provenance
Physical form and stability Assess the condition of free-acid material and its solutions over time.
Form and conditioned properties
Attach physical observations and constants to an identified sample and test conditions.
Usable property evidence
Require direct applicability before using solubility or thermal data.
- What physical form, water content and solvent composition were present during the measurement? measurement
- Do reported solubility, melting or boiling data concern verified free acid, and were decomposition or other transformations distinguished? provenance
Storage and chemical change
Track whether storage or preparation changes acid content or identity.
Stability and retest decision
Treat possible lactonisation or other transformations as hypotheses requiring sample-specific evidence.
- Under the recorded temperature, pH and storage duration, is there measured evidence of lactone formation or other chemical change? measurement
- Which validated changes in assay or impurity profile require retesting or rejection for the intended use? action
Use qualification and handling Connect the verified acid sample to a bounded use and applicable handling evidence.
Intended use and grade
Define what sample quality and evidence the proposed operation requires.
Fit-for-use boundary
Evaluate reagent or analytical use without importing claims from related products.
- What assay, stereochemical purity and impurity limits does the proposed analytical or chemical use require? action
- Does supporting evidence concern the free acid, a threonate salt or a finished formulation? boundary
Acid-specific safety records
Match handling and regulatory information to the actual material.
Applicable handling evidence
Preserve the distinction between an assessed classification and missing information.
- Which current SDS and jurisdictional records match the free-acid identity, concentration and supplied grade? provenance
- What handling, storage and disposal measures do those records support, and which hazard classifications or exposure limits remain unverified? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these check these first hold for the sense of L-threonic acid this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these identifiers and schemes hold for the sense of L-threonic acid this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these real-world use hold for the sense of L-threonic acid this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these typical measurements hold for the sense of L-threonic acid this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these failure modes and hazards hold for the sense of L-threonic acid this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of L-threonic acid this model covers, and on what evidence? provenance
Classifiers Filled
- Family
- Thing Registry
- Category
- Physical world and living systems
- Entry kind
- thing
- Plane
- PHY
- Domain
- PHY.MAT
What it is Filled
L-threonic acid is a four-carbon sugar acid with formula C4H8O5, corresponding to oxidation of the aldehyde group of L-threose to a carboxyl group, and is associated with ascorbic acid degradation.
In scope
- Molecular identity and stereochemistry of L-threonic acid
- Free-acid content, stereochemical purity and sample impurities
- Physical form, solution concentration and acid-base speciation
- Analytical identification, quantification and stability assessment
- Substance-specific handling evidence and regulatory identifiers
Out of scope
- Magnesium, calcium and other L-threonate salts as independently specified substances
- D-threonic acid, erythronic acid and unresolved stereoisomer mixtures as separate substances
- L-threonine and L-threose
- Finished supplements, medicines and their efficacy claims
- Manufacturing processes and complete biological pathways
Why it exists Filled
Enable an agent to recognise L-threonic acid, assess the identity and condition of a sample, and determine its suitability for a specified chemical or analytical use.
Distinguishing features Filled
- Require the (2R,3S)-2,3,4-trihydroxybutanoic acid structure; formula C4H8O5 alone does not establish stereochemical identity. [PubChem](https://pubchem.ncbi.nlm.nih.gov/compound/L-threonic-acid)
- Distinguish the protonated acid from its L-threonate conjugate base and from counterion-containing salts. [PubChem](https://pubchem.ncbi.nlm.nih.gov/compound/L-threonic-acid)
- Use stereochemistry-sensitive evidence to distinguish L-threonic acid from D-threonic acid and erythronic stereoisomers.
- Check functional groups and elemental composition to exclude similarly named L-threonine and L-threose.
- Confirm identifiers against structure: PubChem CID 5460407 and CAS 7306-96-9 identify this entry; a name containing only 'threonate' is insufficient. [PubChem](https://pubchem.ncbi.nlm.nih.gov/compound/L-threonic-acid)
What robots and AI may and may not do Filled
Must not
- Claim that its salts improve memory or treat disease beyond what evidence shows.
- Confuse it with ascorbic acid or present it as a source of vitamin C.
- Recommend doses of supplements containing it to a person.
Only with a human decision
- Advising a person to take a supplement containing its salts.
May
- Describe L-threonic acid and its relation to vitamin C breakdown from chemical sources.
- Report safety data for its salts as stated by the competent authorities.
Moral aspects Filled
- Supplements based on it are marketed with cognitive claims that outrun the evidence.
- People with health conditions may rely on such claims instead of care.
Who is affected
- Supplement buyers
- People seeking help for memory or sleep
Owners Filled
Steward
Nobody owns the compound; makers answer for products that contain it.
Links to other meta-models Filled
parent
- Q56397496 - registry parent class
- Q61476 - registry parent class
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.l-threonic-acid
- Wikidata: Q3270244 (https://www.wikidata.org/wiki/Q3270244)
Direct properties required Filled
- Stereochemical identity: (2R,3S); alternate stereoisomer; unresolved
- Acid and salt relationship: Free acid; dissolved conjugate base; identified counterion and stoichiometry
- L-threonic acid assay: Mass fraction %, with as-received or dry basis and method
- Stereoisomer composition: Mole fraction % for resolved stereoisomers; method and detection limit
- Water and residual solvent content: Mass fraction % or mg/g, separately by component
- Physical presentation: Observed solid, liquid or solution; temperature, solvent and concentration
- Solution acidity and speciation: pH and estimated species fractions at stated temperature, concentration and ionic strength
- Conditioned physical constants: Solubility in g/L; thermal events in °C; pressure, medium and method required
- Impurity and degradation profile: Identified components in mass fraction % or mg/kg; unresolved signals recorded separately
- Handling and regulatory evidence: Matched SDS, jurisdiction, revision date, identifiers and evidence status
Recognition required Filled
- Usually seen as a white solid or as calcium or magnesium salts in powders and tablets.
- Identity is confirmed by laboratory analysis, not appearance.
Capabilities and actions required Filled
- Match a labelled sample to the stereochemically defined registry identity.
- Calculate usable acid quantity from assay, water content and reporting basis.
- Select identity and purity measurements that address stereoisomer confusion.
- Prepare a solution with recorded total concentration, pH and solvent conditions.
- Evaluate sample changes against a documented stability specification.
- Link neutralisation products to the appropriate L-threonate salt model.
Hazards and failure modes required Filled
- Supplement products may be mislabelled or make unsupported health claims.
Standards and interfaces required Filled
- The Globally Harmonized System of Classification and Labelling of Chemicals, published by the United Nations, provides a framework for evaluating chemical hazards without implying that L-threonic acid has a particular hazard classification.
- The Classification, Labelling and Packaging Regulation, adopted by the European Parliament and the Council of the European Union, applies to assessment of L-threonic acid supplied within its scope in the European Union.
Context of use required Filled
- L-threonic acid is encountered in carbohydrate chemistry and investigations of ascorbic acid degradation.
- It is used in research and analytical contexts where distinguishing the free acid, its stereoisomers and its salts matters for interpreting results.
Sources Filled
- Wikidata item Q3270244: L-threonic acid - identity and sense of the item
- Wikipedia: Threonic acid - general description of the item
Open questions
- Which reliable measurements establish free-acid solubility and thermal behaviour, with sample form and test conditions stated?
- What experimentally supported dissociation constant and speciation model apply to relevant aqueous conditions?
- Under which preparation and storage conditions, if any, does lactonisation or other transformation materially alter the sample?
- Which validated analytical methods distinguish all relevant threonic and erythronic stereoisomers in the intended matrices?
- Which EC identifier, GHS classification and substance-specific exposure limits, if any, are supported by current records for the free acid?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q3270244/spec.json