thiamine(1+) ion
Enable an agent to identify thiamine(1+) ion, assess evidence for its presence and condition, and choose appropriate analytical or handling actions for the material containing it.
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 identify thiamine(1+) ion, assess evidence for its presence and condition, and choose appropriate analytical or handling actions for the material containing it.
The thiamine(1+) ion is the monovalent organic cation of vitamin B1, with formula C12H17N4OS+, comprising an aminopyrimidine ring linked by a methylene group to a positively charged thiazolium ring bearing methyl and hydroxyethyl substituents.
It can be Resolve a thiamine-labelled record against the reference cation structure and flag salt or derivative mismatches.; Convert reported salt content to cation equivalents when composition, hydration and assay basis are established.; Select and document an assay capable of separating unphosphorylated thiamine from relevant related compounds.; Compare intact-thiamine measurements across documented storage or preparation conditions.; Retrieve handling and regulatory information for the identified containing material and assess its applicability..
Distinguishing features
Match C12H17N4OS with net charge +1 to the reference molecular graph, rather than relying on the name vitamin B1; reference identity: [ChEBI:18385](https://www.ebi.ac.uk/chebi/CHEBI%3A18385).
Require the connected aminopyrimidine and substituted thiazolium rings with the hydroxyethyl side chain specified by the reference structure.
Check that the hydroxyethyl group is not phosphate-esterified before assigning the unphosphorylated ion identity.
Separate counterions and waters of hydration from the molecular-ion formula when interpreting a salt or supplier record.
Distinguish the +1 species from additional protonation states and chemically altered forms even when an assay reports them collectively as thiamine.
Scope
+ Molecular connectivity and the specific +1 charge state
+ Distinction between the cation, its salts and its phosphorylated derivatives
+ Amount, concentration and purity evidence with an explicit reporting basis
+ Solution conditions, chemical integrity and transformation observations
+ Traceable identity records and applicability of material-specific handling information
- Complete models of thiamine chloride, hydrochloride, nitrate and other salt materials
- Thiamine phosphate esters and other covalently modified derivatives
- Vitamin supplements, pharmaceutical formulations and food products
- Clinical deficiency diagnosis, treatment and nutritional dose recommendations
- Complete biosynthesis, transport and cofactor-dependent reaction pathways
Characteristics
- Reference molecular identity
- C12H17N4OS+; ChEBI:18385; structure identifier and database version Establishes the specific chemical entity behind ambiguous thiamine names.
- Net charge assignment
- +1 for the target entity; other or unresolved for observations requiring reassignment Prevents conflation of the registered cation with other protonation states.
- Phosphorylation status
- Unphosphorylated target; phosphorylated derivative; unresolved Separates this ion from related metabolites and cofactor forms.
- Containing material
- Linked salt, solution, biological sample or formulation, with counterion and hydration details where applicable Locates bulk properties and handling requirements on the material actually encountered.
- Thiamine amount or concentration
- mol, mol/L or mg/L; explicitly state cation, salt or total-thiamine equivalent basis Supports valid comparisons and prevents errors from salt-to-cation mass conversion.
- Intact unphosphorylated thiamine fraction
- mol% or mass%, with denominator, method and uncertainty Distinguishes chemical integrity from nominal content or chromatographic area percentage.
- Medium and exposure conditions
- Solvent, pH, temperature in °C, ionic strength in mol/L, illumination and elapsed time Makes speciation and stability observations interpretable and reproducible.
- Analytical identity confidence
- Reference-confirmed, provisionally assigned, unresolved or contradicted Controls whether an agent can treat a signal as evidence for this exact species.
Also called
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 · 15 findings · 28 questions.
Cation identity and boundaries Establish which thiamine entity a name, structure or registry record denotes.
The registered thing is a specific molecular cation, while practical records often describe salts or vitamin activity.
Molecular identity
Resolve the structural requirements for the unphosphorylated +1 species.
Reference structure match
Record agreement with the reference molecular graph and charge; a shared common name alone is insufficient.
- Does the candidate structure match the connectivity and +1 charge of ChEBI:18385? definition
- Which inspected source and version support the structure-to-registry mapping? provenance
Salt and derivative boundaries
Separate the ion from materials containing it and chemically distinct relatives.
Entity-level disambiguation
Classify each linked record as the target cation, a containing material, another charge state or a covalent derivative.
- Does the reported formula describe the cation alone or include counterions, additional protons or water? boundary
- Is the hydroxyethyl group unmodified, or does the record describe a phosphate ester or another derivative? boundary
Speciation and chemical integrity Assess whether the target ion remains the appropriate identity under the observed conditions.
A nominal thiamine label does not establish the charge-state distribution or the persistence of intact thiamine.
Medium-dependent speciation
Connect charge-state assignments to the medium and evidence used to support them.
Solution species assignment
Keep the reference +1 identity distinct from experimentally established or predicted species populations in a sample.
- What solvent, pH, temperature and ionic strength apply to the claimed +1 species population? measurement
- What experimental evidence or validated equilibrium model supports that population assignment? provenance
Integrity through exposure
Track intact thiamine through preparation, storage and analysis.
Transformation evidence
Record measured loss and identified products without treating an unexplained signal decrease as a settled reaction mechanism.
- How does the measured amount of intact unphosphorylated thiamine change with documented exposure time and conditions? measurement
- What evidence distinguishes chemical transformation from adsorption, extraction loss or assay interference? boundary
- Which supported preparation or storage adjustment would preserve the target for the intended measurement? action
Analytical recognition and quantity Determine what an assay identifies and how its reported amount relates to this cation.
Unphosphorylated thiamine, total thiamine and salt-based mass values answer different questions.
Assay selectivity
Establish whether the analytical workflow specifically supports the target identity.
Signal-to-species evidence
Link the assignment to standards, separation and detection evidence, including any chemical conversion during sample preparation.
- Which reference-standard and orthogonal observations distinguish unphosphorylated thiamine from likely interferents? measurement
- Does extraction, hydrolysis or derivatization change which original thiamine species the final signal represents? boundary
- If mass spectrometry is used, how are the observed charge and ion assignment distinguished from assumptions about solution speciation? measurement
Quantity and purity basis
Make amount, concentration and purity comparable across source materials and assays.
Cation-equivalent accounting
Require explicit denominators and composition before converting a material's reported content to target-cation equivalents.
- Is the result expressed as cation mass, salt mass, moles of unphosphorylated thiamine or total-thiamine equivalents? definition
- What salt stoichiometry, hydration, assay value and uncertainty support a conversion to cation equivalents? measurement
- Does the purity result represent a validated amount fraction or only a detector-dependent peak-area fraction? boundary
Material context and permitted use Connect the molecular identity to the physical material and evidence needed for a proposed operation.
An ion identity alone cannot supply a bottle's phase properties, grade or applicable handling classification.
Carrier material properties
Assign bulk measurements to the particular salt, solution or formulation on which they were obtained.
Property attribution
Keep measured material properties attached to their composition and conditions instead of presenting them as universal constants of the cation.
- Which salt, hydrate, solution composition or other material was used for a reported solubility or thermal measurement? provenance
- Does a reported thermal event describe melting, dehydration or decomposition, and under what conditions? measurement
- Which properties are applicable to the intended sample rather than merely to another material carrying the thiamine name? boundary
Handling and regulatory applicability
Resolve identifiers and handling evidence for the material involved in an actual operation.
Operation-specific evidence
Assess proposed analytical or handling actions using the matched material record, grade and current jurisdictional information.
- Do the CAS, EC and supplier identifiers refer to the target ion or to the specific salt or formulation being handled? boundary
- Which current source establishes any applicable GHS classification or exposure limit for that material and jurisdiction? provenance
- Do the documented grade, impurities and handling requirements support the proposed preparation or analytical use? 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 from recall; no sources were consulted.
- Registry identifiers should be checked against the exact charge and protonation state; records for the cation and its salts can differ.
- Melting points, solubility, purity specifications and hazard classifications require a specified salt, hydration state and preparation; none are assigned here to the cation alone.
- Which of these check these first hold for the sense of thiamine(1+) ion this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- Molecular formula (Hill notation) - C12H17N4OS+ - Identifies elemental composition and charge, but does not uniquely specify molecular connectivity.
- Which of these identifiers and schemes hold for the sense of thiamine(1+) ion this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Provided through thiamine salts in vitamin supplements and food fortification.
- Biological precursor of thiamine diphosphate, a coenzyme involved in carbohydrate and amino acid metabolism.
- Analyte in assays of thiamine content in foods and pharmaceutical preparations.
- Which of these real-world use hold for the sense of thiamine(1+) ion 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 of the cation - Approximately 265.36 - g/mol
- Net ionic charge - +1 - elementary charge
- Which of these typical measurements hold for the sense of thiamine(1+) ion 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.
- Alkaline conditions can promote chemical transformation and degradation.
- Sulfites can cleave thiamine and destroy its vitamin activity.
- Using the cation's molar mass for a salt or hydrate produces incorrect mass-to-mole conversions.
- Which of these failure modes and hazards hold for the sense of thiamine(1+) ion this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- The names thiamine and thiamin occur in different naming conventions; they do not distinguish chemical species.
- Which of these regional variation hold for the sense of thiamine(1+) ion 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.
- Thiamine hydrochloride - A salt preparation with chloride counterions and additional protonation, rather than the isolated singly charged cation.
- Thiamine mononitrate - An electrically neutral salt containing the thiamine cation and nitrate counterion.
- Thiamine diphosphate - Has a diphosphate group attached through the hydroxyethyl oxygen and functions as a coenzyme.
- Thiochrome - A chemically distinct fluorescent oxidation product used in some thiamine assays.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of thiamine(1+) ion this model covers, and on what evidence? provenance
What the second pass must settle
- Does the existing Vercy catalogue already contain a model covering this exact cation that should become this registry entry's single publication target?
- Which CAS, PubChem and EC mappings unambiguously denote the +1 cation, and which aggregate salts or broader thiamine identities?
- Which measured equilibrium data establish the +1 species fraction across the solvents, pH values and temperatures relevant to intended use?
- Which validated methods quantify intact unphosphorylated thiamine separately from phosphate esters and degradation products in the intended matrices?
- Which stability, bulk-property and handling claims can be supported for each encountered salt or formulation, and which remain unknown or inapplicable at the isolated-ion level?