vitamin B12
Enable an agent to identify vitamin B12 material, assess its form 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 agent to identify vitamin B12 material, assess its form and condition, and determine its suitability for a specified use.
Vitamin B12 is a family of water-soluble, cobalt-containing corrinoids called cobalamins whose biologically active forms serve as cofactors for methionine synthase and methylmalonyl-CoA mutase in humans.
It can be Resolve a vitamin B12 label to an evidenced cobalamin form or record the identity as unresolved.; Compare measured B12 content and impurity profiles against a stated material specification.; Convert content between mass and molar quantities when molecular identity and measurement basis are established.; Assess whether storage history warrants continued use, retesting or quarantine.; Determine whether available evidence supports a proposed research, food or pharmaceutical application.; Link the substance to containing products and biological processes without transferring their properties to the substance itself..
Distinguishing features
Establish a cobalamin identity through evidence of the cobalt-containing corrin structure and relevant nucleotide component, rather than treating every cobalt-containing compound as vitamin B12.
Distinguish cyanocobalamin, hydroxocobalamin, methylcobalamin and adenosylcobalamin by the cobalt-associated upper ligand and verified chemical form.
Separate nutritionally relevant cobalamins from corrinoid analogues; a broad assay response alone does not establish equivalent vitamin activity.
Distinguish the identified B12 substance from the total mass of its solution, carrier mixture, food matrix or finished dosage form.
Scope
+ Cobalamin form, molecular identity and form-specific identifiers
+ Composition, concentration, purity and distinction from inactive corrinoid analogues
+ Physical state, degradation and storage conditions
+ Evidence of vitamin activity and suitability for a stated application
+ Material provenance, grade and applicable handling constraints
- Finished supplements, fortified foods and medicinal formulations as products
- Patient vitamin B12 status, deficiency diagnosis and treatment decisions
- Organisms and industrial processes that produce cobalamins
- Other B vitamins and corrinoids without established vitamin B12 activity
- Laboratory instruments and assay procedures as independently managed things
Characteristics
- Cobalamin form
- cyanocobalamin | hydroxocobalamin | methylcobalamin | adenosylcobalamin | identified mixture | unresolved Chemical identity, analytical interpretation and suitability depend on the form present.
- Chemical identity references
- Verified structure and form-specific CAS, PubChem or EC records where applicable A family name must not silently inherit the identifiers of one member, salt or hydrate.
- B12 content
- µg/g, mg/g, µg/mL or mol/L, with named analytes and measurement basis Content must distinguish actual cobalamin quantity from the mass of a preparation.
- Purity and corrinoid profile
- Mass fraction or validated analytical proportion, with individual forms, analogues and impurities identified Total corrinoid signal can conceal a composition unsuitable for the intended use.
- Physical presentation
- Solid | dissolved | dispersed; include solvent, carrier, hydration and relevant conditions Presentation affects sampling, concentration interpretation and stability.
- Identity and content evidence
- Analytical method, reference standard, report, sampling date and uncertainty An agent needs to know which conclusions the measurement actually supports.
- Stability condition
- Within supported conditions | excursion under assessment | degradation demonstrated | unknown The initial certificate does not establish the current condition after storage or exposure.
- Exposure history
- Temperature in °C, duration, light exposure, humidity where relevant, and solution pH Form and matrix determine how environmental exposure affects retained identity and content.
- Material grade and intended use
- Reference standard | research reagent | food ingredient | pharmaceutical material | other documented grade Suitability follows documented specifications, not the vitamin name alone.
- Use and handling authority
- Applicable specification, safety data sheet and jurisdiction-specific use requirements, each with version and date Handling and permitted applications must be evaluated for the actual material and context.
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: 6 bundles · 11 layers · 19 findings · 30 questions.
Cobalamin identity Establish which chemical member or mixture the vitamin B12 name denotes.
Vitamin B12 is used as a family name and as shorthand for particular forms, creating consequential identity ambiguity.
Molecular form
Resolve structural features that distinguish cobalamins and neighbouring corrinoids.
Form assignment
Record the supported cobalamin identity, including ligand, salt or hydration details where relevant.
- Which cobalamin form or mixture is present, and what analytical evidence establishes that assignment? definition
- Does the evidence distinguish the material from non-B12 corrinoids and inactive analogues? boundary
Identity records
Connect the established form to authoritative chemical records.
Identifier fit
Keep family-level names separate from identifiers and constants belonging to a specific chemical form.
- Which verified CAS, PubChem and EC records describe this exact form rather than vitamin B12 generically? provenance
- Do the formula and molar mass include the actual counterions, hydration or solvation state? measurement
Content and analytical quality Establish how much relevant B12 is present and what the analytical evidence can resolve.
A preparation's mass and a total corrinoid assay result are not interchangeable with verified B12 content.
Quantity basis
Express content with explicit analytes, units and material basis.
Attributable B12 content
Record form-specific or justified total B12 content without counting carriers as vitamin.
- What is the measured content of each identified B12 form, in which units and on an as-received or dry basis? measurement
- If total B12 is reported, which forms are summed and how are their different molecular masses handled? measurement
Selectivity and impurities
Determine whether analysis separates relevant forms, analogues and degradation products.
Assay interpretability
Tie identity, purity and content conclusions to method selectivity and reference materials.
- Can the assay distinguish the named cobalamins from corrinoid analogues and degradation products in this matrix? measurement
- Which reference standards, recovery results and uncertainty estimates support the reported content and impurity profile? provenance
Biological relevance Describe the relationship between chemical form and supported vitamin or cofactor activity.
Chemical detection, nutritional relevance and biochemical cofactor function are distinct conclusions.
Activity context
Identify the biological setting in which activity is established.
Supported activity
Record whether evidence concerns a cofactor role, conversion to an active form or a particular biological assay.
- For which organism, enzyme system or nutritional context is this form's B12 activity established? definition
- Does the evidence concern direct cofactor function, metabolic conversion or only an assay response? boundary
Availability boundaries
Separate substance properties from effects introduced by matrices and biological recipients.
Limits of equivalence
Constrain comparisons between forms to the conditions supported by evidence.
- What evidence supports treating these B12 forms as equivalent for the proposed application? provenance
- Which availability claims depend on a containing product, route of administration or recipient and therefore belong to a neighbouring model? boundary
Physical state and stability Track presentation, environmental conditions and changes in cobalamin integrity.
Current usability depends on the actual form, matrix and exposure history.
Presentation and properties
Describe the material state and condition-dependent physical properties.
Condition-specific properties
Associate solubility and thermal observations with the identified form and test conditions.
- Is the B12 a solid, solution or dispersion, and what solvent, carrier, temperature and pH define that state? definition
- Which solubility or thermal data apply to this form, and do reported thermal events represent melting or decomposition? measurement
Integrity over time
Relate storage and handling history to demonstrated retention of identity and content.
Stability disposition
Use applicable stability evidence to decide whether the material remains suitable.
- What evidence establishes acceptable light, temperature, moisture and solution conditions for this form and matrix? provenance
- Do documented excursions or analytical changes require retesting, quarantine or rejection for the intended use? action
Provenance and use suitability Connect the material's origin and specification to justified uses and handling decisions.
Being identified as vitamin B12 does not establish a material's grade, permitted application or handling requirements.
Lot and grade evidence
Trace the assessed material to its supplier, lot and applicable quality requirements.
Specification conformance
Assess whether lot evidence supports the claimed grade and intended application.
- Which supplier, lot, production origin and certificate of analysis describe the material being assessed? provenance
- Does this lot meet the identity, content, impurity and other quality criteria required for its intended grade? action
Handling and permitted use
Resolve safety and use constraints for the actual chemical form and preparation.
Contextual use decision
Ground use and handling decisions in applicable documentation without inferring them from nutritional importance.
- Which current safety classification, exposure limits if established, and handling instructions apply to this exact material and jurisdiction? provenance
- Is the proposed application supported by the relevant form, grade and jurisdiction-specific requirements? action
- Which handling requirements arise from B12 itself and which arise from solvents, carriers or other formulation components? boundary
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 nutritional cobalamin family; some chemical catalogs use vitamin B12 more narrowly for cyanocobalamin.
- Identifiers, purity requirements, physical constants, and hazard classifications must be checked for the exact form, hydration state, and preparation.
- These statements are recalled knowledge, not researched findings; current regulatory and pharmacopoeial details require verification.
- Which of these check these first hold for the sense of vitamin B12 this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Cyanocobalamin
- Hydroxocobalamin
- Methylcobalamin
- Adenosylcobalamin (5'-deoxyadenosylcobalamin)
- Which of these kinds and varieties hold for the sense of vitamin B12 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 - 68-19-9 - Identifies cyanocobalamin specifically; the vitamin B12 family does not have a single identifier covering all forms.
- PubChem CID - Positive integer assigned to a compound record - Specify the cobalamin form before assigning a compound identifier.
- Which of these identifiers and schemes hold for the sense of vitamin B12 this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- United States Pharmacopeia-National Formulary, issued by the United States Pharmacopeial Convention: monographs specify identity and quality requirements for cyanocobalamin and relevant preparations.
- European Pharmacopoeia, published by the European Directorate for the Quality of Medicines & HealthCare: monographs establish quality requirements for specified cobalamin substances and preparations.
- Which of these standards and regulation hold for the sense of vitamin B12 this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Nutritional supplementation and food fortification.
- Medicinal replacement of vitamin B12 in deficiency.
- Hydroxocobalamin as a cyanide antidote in a specific medicinal formulation.
- Microbiological and biochemical assays involving vitamin-dependent growth or enzyme activity.
- Which of these real-world use hold for the sense of vitamin B12 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 cyanocobalamin - Approximately 1355.37 - g/mol
- Cobalt atoms per cobalamin molecule - 1 - atom/molecule
- Which of these typical measurements hold for the sense of vitamin B12 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.
- Light exposure and unsuitable processing or storage conditions can degrade cobalamins; stability depends on the form and formulation.
- Some corrinoid analogues lack vitamin B12 activity in humans and can confound assays that do not adequately distinguish them.
- Cobalt sensitivity or hypersensitivity to a preparation can cause adverse reactions.
- Confusing substance identity, assay basis, or formulation concentration can produce potency and dosing errors.
- Insufficient intake or impaired absorption can cause deficiency with hematologic and neurologic consequences.
- Which of these failure modes and hazards hold for the sense of vitamin B12 this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- Permitted forms, labeling requirements, and classification as a food ingredient, supplement, or medicine depend on jurisdiction and intended use.
- Pharmacopoeial requirements depend on the applicable compendium and edition.
- Which of these regional variation hold for the sense of vitamin B12 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.
- Corrinoids - Corrinoids are the broader structural class; membership alone does not establish vitamin B12 activity in humans.
- Cyanocobalamin - Cyanocobalamin is one defined B12 form with a cyano upper axial ligand, whereas vitamin B12 can denote the family.
- Cobalt - Cobalt is the chemical element coordinated within cobalamins; elemental cobalt or cobalt salts are not vitamin B12.
- Vitamin B12 supplement - A supplement is a formulated product containing a specified cobalamin form and other ingredients.
- Vitamin B12 deficiency - Deficiency is a physiological condition involving inadequate available B12, not the substance itself.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of vitamin B12 this model covers, and on what evidence? provenance
What the second pass must settle
- Does the registry intend vitamin B12 to denote the cobalamin vitamin family or specifically cyanocobalamin, and is an existing Vercy model already authoritative for that scope?
- Which chemical identifiers and reference specifications should anchor each included form, salt and hydration state?
- Which methods reliably distinguish nutritionally relevant B12 from corrinoid analogues in the matrices this registry must support?
- What form-specific stability evidence supports storage conditions, retest intervals and responses to exposure excursions?
- Which intended applications and jurisdictions must be covered before safety classifications and use permissions can be resolved?