L-aspartic acid
Enable an agent to recognise L-aspartic acid, assess the identity and fitness of a particular material, and decide which handling, analytical or application steps its evidence supports.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an agent to recognise L-aspartic acid, assess the identity and fitness of a particular material, and decide which handling, analytical or application steps its evidence supports.
L-aspartic acid is the proteinogenic α-amino acid with (S) configuration, molecular formula C4H7NO4 and a carboxymethyl side chain, occurring predominantly as L-aspartate at physiological pH.
It can be Resolve a material label to the L-specific substance identity and flag ambiguous stereochemistry or salt form.; Select identity, assay and stereochemical tests that address gaps in a lot's evidence.; Calculate usable substance content from a declared assay basis and measured water content.; Plan dissolution or solution preparation using evidence tied to solvent, pH, concentration and temperature.; Accept, quarantine or reject a lot against a stated application specification.; Choose storage and handling steps from applicable documentation and the material's observed condition..
Distinguishing features
Require evidence for the aspartic-acid molecular structure; an amino-acid label alone does not distinguish it from glutamic acid or asparagine.
Require an appropriate stereochemical identification result; a non-stereospecific identity assay cannot establish L-aspartic acid rather than its D form or a mixture.
Check counterions and the supplied chemical form to distinguish free-acid material from an aspartate salt.
Establish whether the substance is free or peptide-bound before treating an aspartyl residue as an instance of this material.
Separate the named substance from its concentration in a mixture; a product containing L-aspartic acid is not a pure-material lot.
Scope
+ Molecular identity and evidence distinguishing the L stereoisomer from D-aspartic acid and mixed stereoisomer material
+ Chemical purity, stereochemical purity, water content and relevant impurities of a sample or lot
+ Solid material and dissolved-state behaviour under recorded environmental conditions
+ Grade, traceability, analytical evidence and suitability for a specified use
+ Substance-specific handling, storage and applicable hazard documentation
- D-aspartic acid and racemic aspartic acid as independently supplied substances
- Aspartate salts, esters and other derivatives as independently registered materials
- Aspartyl residues bound within peptides and proteins
- Finished supplements, foods, medicines or reagent mixtures containing L-aspartic acid
- Manufacturing processes, metabolic pathways and clinical treatment decisions
Characteristics
- Verified substance identity
- Verified preferred name, molecular representation and source-checked CAS, EC and PubChem identifiers Prevents records for stereoisomers, salts or broader aspartic-acid concepts from being merged.
- Stereochemical composition
- L and D fractions in %, or enantiomeric excess in %, with method and reporting basis Establishes whether the material satisfies an L-specific specification independently of chemical assay.
- L-aspartic acid assay
- % mass fraction or amount concentration, with method and as-is, dry or other declared basis Supports quantitative use without confusing assay, water content and stereochemical purity.
- Supplied form and counterions
- Free-acid solid, solution with declared composition, or separately identified salt; counterion identity and amount where applicable Controls identity boundaries and the interpretation of mass, concentration and solution behaviour.
- Water and residual impurities
- Water in % mass fraction; named impurities in % or mg/kg, with methods and detection limits Determines usable content and whether a lot meets the requirements of its intended application.
- Solution conditions
- Solvent composition, concentration, pH, temperature in °C and relevant added ions Makes observations of dissolution and acid-base behaviour interpretable.
- Thermal and phase behaviour
- Observed transition or decomposition temperature in °C, with method, pressure and sample condition Prevents a decomposition event or an unqualified reference value from being treated as a usable melting or boiling point.
- Lot and grade evidence
- Links to supplier, lot, certificate of analysis, grade specification, safety data sheet and storage history Connects suitability and handling decisions to the actual material rather than to its name alone.
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 5 bundles · 9 layers · 14 findings · 23 questions.
Molecular and stereochemical identity Establishes what qualifies as L-aspartic acid and how that identity is demonstrated.
A shared amino-acid name or non-stereospecific assay can conceal a different stereoisomer, derivative or material form.
Structure and identifiers
Connects the registry entry to an explicitly stereochemical molecular identity.
L-specific identity evidence
Record identifiers and structural evidence at the same stereochemical granularity as this entry.
- Which authoritative molecular representation and identifiers explicitly denote L-aspartic acid? definition
- Which source was read to establish each identifier, and does it describe the free acid rather than a salt or stereochemically unspecified substance? provenance
Stereoisomer and derivative boundaries
Distinguishes L-aspartic acid from closely related substances and bound residues.
Stereochemical and form discrimination
Keep molecular identity, enantiomeric composition and supplied chemical form as separate determinations.
- What analytical evidence distinguishes the L form from D-aspartic acid or an L/D mixture in this sample? measurement
- Is the material free L-aspartic acid, an independently supplied aspartate salt, a derivative or a peptide-bound residue? boundary
Lot composition and grade Describes how much qualified L-aspartic acid a particular material contains and what accompanies it.
Chemical assay, enantiomeric composition and application grade answer different questions and cannot substitute for one another.
Assay and stereochemical purity
Makes quantitative composition results comparable and usable.
Independent purity measures
Record assay basis and stereochemical selectivity so a total-content result is not mistaken for L-specific content.
- Does the assay quantify L-aspartic acid specifically or total aspartic acid, and is the result reported as-is or on a corrected basis? measurement
- What D-isomer content or enantiomeric excess was measured, using which method and quantification limit? measurement
Impurities and grade qualification
Relates accompanying material and documentary claims to the intended use.
Lot-specific acceptance evidence
Assess water, related substances and other relevant contaminants against an identified specification.
- Which water, related-substance, residual-solvent, elemental or microbiological results are required by the intended-use specification, and which are available? measurement
- Which dated certificate and specification support the claimed grade for this exact lot? provenance
Physical state and solution behaviour Records condition-dependent behaviour relevant to weighing, dissolution and thermal exposure.
L-aspartic acid preparation requires evidence about the actual solid and solution conditions rather than isolated reference constants.
Solid and thermal state
Characterises the supplied solid and interprets its response to temperature.
Qualified solid-property observations
Associate appearance, water content and thermal observations with a specific material and method.
- What solid form, appearance and water content were observed, and were these established analytically or inferred from the label? measurement
- Does a reported thermal value represent melting, decomposition or another transition, and under what method and conditions? measurement
Dissolution and acid-base state
Tracks solution preparation and the distinction between starting material and dissolved species.
Condition-dependent solution identity
Record solvent, pH and additions without treating every change of protonation as a new supplied substance.
- What solubility or dissolution evidence applies at the proposed solvent composition, pH, concentration and temperature? measurement
- If acid or base is added, how will the resulting solution composition, counterions and concentration basis be recorded? action
- When should a preparation be represented as a solution derived from L-aspartic acid versus a separately identified aspartate salt material? boundary
Handling and use qualification Connects material evidence to storage, handling and a specified application.
The substance name alone does not establish a lot's safe handling conditions, permitted use or continued fitness after storage.
Hazard and storage evidence
Grounds handling decisions in applicable documentation for the supplied form.
Applicable handling conditions
Record verified classifications, exposure guidance and storage instructions with their documentary scope.
- What current safety data sheet and jurisdiction-specific classification apply to this L-aspartic acid material and its supplied form? provenance
- What storage, dust-control, incompatibility and disposal instructions does that documentation support, and are any exposure limits specifically applicable? action
Application and release decision
Determines whether the lot's evidence supports a concrete proposed use.
Evidence-based lot disposition
Make acceptance conditional on the relevant identity, purity, grade and storage requirements.
- What requirements for L-isomer content, chemical assay, contaminants and grade must this lot meet for the proposed use? definition
- Given its results, retest date and storage history, should the lot be released, retested, quarantined or rejected? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
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.
- This description is recalled knowledge; no sources were consulted.
- Check temperature, solvent and ionic strength before using acid-base constants quantitatively.
- Verify grade-specific specifications, thermal decomposition data and jurisdiction-specific hazard or regulatory status before practical use.
- Which of these check these first hold for the sense of L-aspartic 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.
- CAS Registry Number - 56-84-8 - Identifies L-aspartic acid; distinguish the D enantiomer, racemate and salts.
- IUPAC name - (2S)-2-aminobutanedioic acid - Specifies the stereochemistry.
- Amino-acid residue codes - Asp; D - Three-letter and one-letter protein sequence codes; the one-letter D does not indicate D stereochemistry.
- Which of these identifiers and schemes hold for the sense of L-aspartic 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.
- A component of proteins made by biological translation.
- A reagent and building block in biochemical research and chemical synthesis.
- A starting material for manufacturing aspartame.
- A component of formulated cell-culture media.
- Which of these real-world use hold for the sense of L-aspartic acid this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Molar mass - 133.10 - g/mol
- Isoelectric point - Approximately 2.8 - dimensionless
- Which of these typical measurements hold for the sense of L-aspartic 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.
- Airborne powder can cause mechanical irritation; handling controls depend on the material's safety data sheet.
- Substitution with D-aspartic acid or a racemic mixture changes stereochemical identity and can invalidate biological or synthetic applications.
- Confusing the free acid with an aspartate salt changes formula mass, counterion content and solution preparation.
- Chemical purity alone does not establish enantiomeric purity or suitability for food, pharmaceutical or cell-culture use.
- Which of these failure modes and hazards hold for the sense of L-aspartic 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.
- L-aspartate - A deprotonated form of L-aspartic acid; protonation state depends on pH, and isolated salts also contain counterions.
- D-aspartic acid - The opposite enantiomer, with (R) configuration at the α-carbon.
- DL-aspartic acid - A racemic mixture of the L and D enantiomers.
- L-asparagine - Has a side-chain carboxamide in place of the side-chain carboxylic acid.
- L-glutamic acid - Has one additional methylene group in its side chain.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of L-aspartic acid this model covers, and on what evidence? provenance
What the second pass must settle
- Which authoritative sources establish the exact L-specific CAS, EC and PubChem identifiers, and how do they distinguish free-acid and stereochemically unspecified records?
- Which validated methods and acceptance criteria should establish L identity and detect D-aspartic acid for each intended grade?
- What measured solubility and acid-base data are available under relevant preparation conditions, and how should conflicting values be reconciled?
- Which thermal values are experimentally supported, and do reported melting or boiling entries instead describe decomposition or unavailable measurements?
- Which current grade specifications, hazard classifications, exposure limits and storage or retest requirements apply to the intended jurisdiction and use?