adenine
Enable an AI agent to recognise adenine, assess an identified sample's composition and condition, and determine its suitability for a specified use.
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 AI agent to recognise adenine, assess an identified sample's composition and condition, and determine its suitability for a specified use.
Adenine is a purine nucleobase with molecular formula C5H5N5, structurally 6-aminopurine, that forms part of DNA, RNA, and biologically important nucleotides such as ATP.
It can be Verify an adenine sample's identity using structural and analytical evidence.; Calculate the required sample mass from target adenine amount, chemical form and assay basis.; Assess whether an adenine solution can reach and retain the concentration required by a specified protocol.; Accept, reject or qualify a lot for an analytical or biological application using relevant impurity and performance evidence.; Trace adenine's relationship to a nucleoside, nucleotide or polymer without treating those substances as interchangeable.; Select storage, handling and disposal actions from evidence applicable to the actual supplied material..
Distinguishing features
The molecular structure must match 6-aminopurine; molecular formula alone does not establish adenine identity.
Adenine has no covalently attached sugar, distinguishing the free base from adenosine and deoxyadenosine.
An adenine-containing nucleotide has additional sugar and phosphate components and must not be identified as free adenine.
Adenine must be distinguished analytically from other purine bases, particularly guanine and hypoxanthine; a generic nucleobase or UV-absorbance result is insufficient.
An adenine salt, hydrated material or formulation must have its supplied form recorded rather than inheriting all properties of the neutral base.
Scope
+ Adenine identity as the purine nucleobase with molecular formula C5H5N5
+ Distinction between free adenine and adenine incorporated into nucleosides, nucleotides or polymers
+ Sample purity, impurities, water content and intended-use grade
+ Solid-state and solution behaviour under recorded conditions
+ Adenine-specific biochemical compatibility and handling evidence
- Adenosine, deoxyadenosine and their properties as separate compounds
- AMP, ADP, ATP and other adenine-containing nucleotides as complete substances
- DNA and RNA sequences, structures and whole-polymer behaviour
- Formulated media, medicines or mixtures containing adenine as complete products
- Manufacturing processes and organism-level purine metabolism as complete systems
Characteristics
- Molecular identity
- 6-aminopurine; C5H5N5; verified structure identifier Establishes that the material is adenine rather than another purine or an adenine-containing compound.
- External chemical identifiers
- Verified CAS, PubChem CID and EC records, each mapped to the represented chemical form Connects evidence and supplier records without conflating the base with salts or mixtures.
- Supplied chemical and solid form
- Neutral base or specified salt; hydrate or solvate status; solid form if established Determines which composition, dissolution and handling evidence applies.
- Adenine assay
- % mass fraction or molar fraction, with analytical method and as-is or dry-basis declaration Supports dosing and acceptance decisions without treating chromatographic area percentage as an interchangeable assay.
- Relevant impurity profile
- Identified impurities in %, mg/kg or method-specific units, with detection and quantification limits Other purines and preparation residues can alter analytical or biological results.
- Water content
- % mass fraction with method Affects the amount of adenine delivered by a weighed sample.
- Aqueous solubility
- mg/mL or mol/L at specified temperature, pH, medium and chemical form Determines whether the required concentration can be prepared and maintained.
- Solution condition
- Concentration, pH, solvent, temperature, preparation age and precipitation status Distinguishes a nominal recipe from the condition of the material actually delivered.
- Thermal behaviour
- Transition or decomposition temperature in °C, with method, pressure and event assignment Prevents a decomposition observation from being used as an ordinary melting or boiling point.
- Biochemical relationship
- Free base, incorporated adenine moiety, or substrate in a specified biochemical context Prevents properties of ATP, nucleic acids or a particular metabolic pathway from being assigned directly to free adenine.
- Use qualification
- Supplier-declared grade and independently evidenced suitability for a named assay or application High chemical purity alone does not establish suitability for every biological or analytical use.
- Hazard and exposure evidence
- Dated, jurisdiction-specific classification, applicable safety data sheet and any established exposure limits Supports handling decisions while distinguishing missing evidence from a finding of no hazard.
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 16 findings · 26 questions.
Adenine identity and boundaries Establishes what counts as adenine and how the registry entry relates to nearby chemical entities.
Adenine is easily conflated with its nucleosides, nucleotides and incorporated biological moieties.
Molecular recognition
Tests molecular identity rather than relying on a name or formula alone.
6-Aminopurine identity
Record a verified structure and the evidence identifying the material as adenine.
- What structural representation establishes the 6-aminopurine identity of this material? definition
- Which reference material and analytical results distinguish it from other purine bases or same-formula alternatives? measurement
Chemical entity boundaries
Separates the free base, supplied forms and larger molecules containing adenine.
Base, supplied form and incorporated moiety
Record whether evidence concerns free adenine, a specified supplied form or an adenine unit within another substance.
- Does this record describe free adenine, an adenine salt or hydrate, or an adenine moiety within another molecule? boundary
- Which verified external identifiers apply to that exact entity, and which identify a neighbouring substance? provenance
Adenine sample quality Captures the composition and qualification of the material being used.
Adenine assay, related purines and water content can change delivered dose and experimental interpretation.
Assay and impurities
Establishes how much adenine is present and what accompanies it.
Quantified adenine content
Record assay basis, water content and impurity measurements with their analytical limitations.
- What is the adenine content, and is it reported as chromatographic area, mass fraction or another quantity on an as-is or dry basis? measurement
- Which related purines, residual reagents and water contributions were measured, and at what detection limits? measurement
Lot and use qualification
Connects sample evidence to the intended analytical or biological task.
Application-specific acceptance
Separate a supplier's grade label from demonstrated fitness for the intended use.
- Which lot-specific certificate and test methods support the declared grade? provenance
- What impurity, contamination or performance criteria must this lot satisfy for the proposed adenine assay or supplementation protocol? action
Adenine physical and solution state Describes the conditions under which an adenine sample is characterised, dissolved and retained in usable condition.
Properties measured for one solid form or solution condition cannot automatically govern preparation under another.
Solid and thermal characterisation
Links physical observations to an identified material form and measurement procedure.
Interpreted thermal events
Record solid-form evidence and distinguish phase transitions from chemical decomposition.
- What evidence establishes the sample's solid form and any associated water or solvent? measurement
- Does the reported thermal value represent melting, decomposition or another event, and under what experimental conditions? measurement
Dissolution and solution maintenance
Relates adenine concentration to pH, medium, temperature and observed solution behaviour.
Usable dissolved adenine
Establish whether the prepared solution contains the required dissolved adenine throughout use.
- What measured solubility supports the target concentration at the intended pH, temperature and medium composition? measurement
- What preparation, dilution and storage conditions keep adenine dissolved and chemically suitable until use? action
Adenine biochemical context Connects adenine to biological structures and transformations while preserving the chemical entity boundary.
Being a nucleobase does not make free adenine equivalent to an energy-carrying nucleotide or guarantee a biological response.
Incorporation and recognition
Distinguishes free-base behaviour from properties expressed in nucleosides and nucleic acids.
Context-dependent base behaviour
Attach pairing and recognition claims to the molecular and experimental context in which adenine participates.
- Does the claimed interaction concern free adenine or adenine incorporated into a specified nucleoside, nucleotide or polymer? boundary
- What molecular environment and experimental evidence support the stated pairing or recognition behaviour? provenance
Salvage and supplementation
Qualifies proposed biological uses by the receiving system and its ability to use adenine.
System-specific adenine use
Record the biological system, relevant uptake or conversion evidence and measured response to supplied adenine.
- What evidence shows that the specified organism, cells or enzyme preparation can take up or convert supplied adenine as intended? provenance
- What adenine concentration, exposure duration and response criteria justify using it in this protocol? action
Adenine handling and disposition Connects handling decisions to evidence for the actual adenine material and its use conditions.
Adenine's biological occurrence is not sufficient evidence for the safety or acceptability of a particular exposure or preparation.
Hazard evidence
Resolves which classifications and exposure evidence apply to the identified substance or preparation.
Applicable adenine classification
Record dated hazard evidence with chemical-form, concentration and jurisdiction boundaries.
- Which current safety data sheet and authoritative classification records apply to this adenine form and jurisdiction? provenance
- Are adenine-specific exposure limits established, and how is absence of a limit distinguished from evidence of safety? boundary
Storage and end of use
Determines how to preserve suitability and decide whether material can be reused or must be discarded.
Condition-based disposition
Use applicable storage instructions, preparation history and observed change to assess the remaining suitability of adenine material.
- What storage and retest conditions are supported for this adenine lot or prepared solution? provenance
- What precipitation, contamination, assay change or elapsed-time criterion triggers requalification or disposal, and which waste instructions apply to the actual preparation? 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 describes the neutral parent nucleobase, not a salt, nucleoside, nucleotide, or formulated product.
- Identifiers and properties are recalled rather than checked against sources.
- Verify thermal decomposition behavior, condition-specific solubility, grade and purity, and applicable hazard classifications before technical use.
- Which of these check these first hold for the sense of adenine 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 - 73-24-5 - Identifies adenine itself; salts and derivatives can have separate identifiers.
- PubChem CID - 190 - Compound identifier for adenine.
- Chemical nomenclature - 6-aminopurine - Names the amino-substituted purine structure.
- Which of these identifiers and schemes hold for the sense of adenine this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Constituent of DNA and RNA, pairing canonically with thymine in DNA and uracil in RNA.
- Constituent of ATP and ADP, which participate in cellular energy transfer.
- Constituent of cofactors including NAD and FAD.
- Supplement in some microbiological and cell-culture media.
- Ingredient in some red-blood-cell storage solutions, supporting maintenance of cellular ATP.
- Which of these real-world use hold for the sense of adenine 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 - 135.13 - g/mol
- Which of these typical measurements hold for the sense of adenine 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.
- Poor aqueous solubility can limit preparation of concentrated solutions; solubility depends on pH and temperature.
- Impurities or incorrect concentration can compromise biological assays and culture performance.
- Powder handling can generate dust; handling precautions should follow the specific supplier's safety data sheet.
- Which of these failure modes and hazards hold for the sense of adenine 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.
- purine - Purine is the parent ring system; adenine has an amino group at position 6.
- adenosine - Adenosine is adenine attached to ribose; adenine alone contains no sugar.
- deoxyadenosine - Deoxyadenosine is adenine attached to 2-deoxyribose.
- adenosine monophosphate - AMP contains adenine, ribose, and one phosphate group; adenine is only its nucleobase component.
- guanine - Guanine is a distinct purine nucleobase with a carbonyl group at position 6 and an amino group at position 2.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of adenine this model covers, and on what evidence? provenance
What the second pass must settle
- Which authoritative CAS, PubChem and EC records identify neutral adenine, and how should salts, hydrates and alternative structural representations link to this registry entry?
- Which solid forms and thermal measurements are sufficiently characterised to distinguish melting from decomposition and establish whether a boiling-point value is meaningful?
- What reliable solubility, acid-base and solution-stability data cover the pH, temperature and media relevant to intended uses?
- Which impurities and qualification tests materially affect adenine's suitability for analytical standards, enzyme assays and biological supplementation?
- What current jurisdiction-specific hazard classifications, exposure limits, storage requirements and disposal guidance apply to the exact adenine material being modelled?