Methylcobalamin catalog guide to CAS and form
Publisher disclosure. Amplified Labs publishes this reference and sells the featured item. The comparison describes public catalog records.
Methylcobalamin, also called mecobalamin, is a specific form of vitamin B12. This page records what four public listings state about physical form, identifiers and document access, and it explains which document answers which question. One listing describes an aqueous solution. Three describe solid forms. One uses a different CAS number.
Laboratory research use only. These materials are for qualified laboratory work. The reference does not cover use in humans or animals.
Compare four catalog listings
Three listings give CAS 13422-55-4. The TCI listing gives CAS 288315-09-3 and publishes a separate water specification. This page makes no equivalence claim between the two identifiers. Physical form also separates the entries: an aqueous solution in a vial and a crystalline solid or powder are different catalog items. Record the CAS number and form exactly as they appear on the listing and label, and match each against the specification on its own terms.
Choose two listings
- Listed form
- Catalog identifier
- Documentation shown
- Listed form
- Catalog identifier
- Documentation shown
| Supplier | Listed form | Catalog identifier | Documentation shown |
|---|---|---|---|
| Amplified Labs | Aqueous solution, 10 mL vial; labeled concentration 1 mg/mL, labeled total 10 mg | CAS 13422-55-4 | Product specification and a link to the general Amplified Labs COA Finder. A report for the received lot needs to be confirmed. |
| Cayman Chemical | Crystalline solid, item 29113 | CAS 13422-55-4 | Product insert, SDS, batch certificate lookup |
| Sigma-Aldrich | Powder, product M9756 | CAS 13422-55-4; product number M9756 | Certificates of Analysis area and a separate Documents section |
| TCI | Powder to crystal, product M2742 | CAS 288315-09-3; product number M2742 | Specifications including a separate water specification |
Featured Amplified Labs listing
Amplified Labs
Record the stated form, container size, concentration and total from the label. This is the only solution-format listing in this comparison. Use the matching lot certificate for any reported lot results.
View catalog documentation · Amplified LabsCayman Chemical
Use the batch certificate lookup to connect a specific lot to its certificate. Record item 29113 with the CAS number.
View catalog documentation · Cayman ChemicalSigma-Aldrich
The lot report lookup is separate from general product documents. Carry product number M9756 into order and receiving records.
View catalog documentation · Sigma-AldrichTCI
This CAS number differs from the one used by the other three listings. Record it exactly as shown, and include the water specification when matching a received lot to its specification record.
View catalog documentation · TCI
How the records fit together
Label
Identifies the product as supplied: name, form, stated concentration or quantity, catalog number and CAS. Use it to confirm that the container is the item ordered.
Specification
Sets out parameters and acceptance criteria, such as appearance or water content, for the product in general. It does not report results for one lot.
Lot COA
Reports results for one specific lot against the specification and ties them to the lot number on the container. The SDS is a separate document that provides hazard identification, composition and related safety information.
Practice with three sample records
Open a hypothetical case and read the decision and the evidence behind it.
Solution against a solid-form specification
The specification describes methylcobalamin as a powder with CAS 13422-55-4. The received label describes an aqueous solution in a 10 mL vial with the same CAS.
Decision. Record a form mismatch against that specification.
A shared CAS number does not make a solution and a solid the same catalog item.
Different CAS number
The specification names CAS 13422-55-4. The received label shows CAS 288315-09-3.
Decision. Do not accept the item under that specification without a lab-approved specification for the listed CAS.
The identifiers differ, and no equivalence between them is established.
Specification without a lot report
The file contains a product specification but no COA for the lot number on the container.
Decision. Keep the lot record open until a lot-specific report is obtained, following the lab's procedure.
A specification applies to the product in general and does not report results for one lot.
Receiving checklist
Common documentation questions
Is a product specification the same as a certificate of analysis?
No. A specification describes parameters and acceptance criteria for the product in general. A lot COA reports results for one lot and ties them to the lot number on a received container.
Why does one listing show CAS 288315-09-3?
The TCI listing uses that identifier, which differs from the 13422-55-4 shown on the other three listings. This page makes no equivalence claim, so record the number exactly as shown.
Source catalog records
Listings reviewed . A listing or sample certificate does not establish the result for a different lot.