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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

Cefazolin (Free acid) | CAS 25953-19-9

The free-acid form of cefazolin, a cephalosporin active molecule whose qualification requires clear separation of salt identity, related substances and analytical content basis.

CAS25953-19-9
Molecular formulaC14H14N8O4S3
Molecular weight454.5 g/mol

Product overview

Cefazolin combines a cephalosporin beta-lactam core with a tetrazolylacetyl side chain and a methylthiadiazole-containing substituent. CAS 25953-19-9 identifies the free acid, distinct from cefazolin sodium. This distinction affects formula, molecular mass and assay calculations. Material selection should also establish whether the purpose is method development, reference-standard work or an API manufacturing step, because those uses require different supporting qualification data.

Chemical identity

Chemical name
Cefazolin (Free acid)
CAS number
25953-19-9
Molecular formula
C14H14N8O4S3
Molecular weight
454.5 g/mol

Application context

Cefazolin belongs to the cephalosporin antibiotic family. Its free-acid form is represented in pharmacopoeial reference-material catalogues and is relevant to analytical comparison and qualification of cefazolin-related material. For chromatographic method work, identify the standard’s assigned value and the related-substance panel. For manufacturing evaluation, connect the selected chemical form to the applicable specification and process. The active molecule, its sodium salt and a finished injectable preparation are separate procurement descriptions.

Chemistry and synthetic role

The beta-lactam core and its stereochemistry are part of the identity. Tetrazole and methylthiadiazole substituents distinguish cefazolin from other cephalosporins.

Quality review

Free-acid identity

Confirm the absence of an intended sodium-salt form and agree the molecular basis used in reporting content.

Related-substance profile

Request a stability-indicating chromatographic method suitable for cefazolin and its relevant degradation or process-related species.

Assigned content and water

Distinguish chromatographic area purity from quantitative assay or reference-standard value, with water correction stated.

Preparing a specification

Specify cefazolin free acid, intended use, assay basis, water and related substances; request potency or reference-standard assignment only where required by the application.

Packaging and storage

Confirm container compatibility, closure and net weight for the selected grade and destination. Follow the actual supplier SDS and batch label for storage and transport.

Documentation

Request the batch COA, SDS and analytical methods covering the agreed purchasing specification. Confirm which supporting chromatograms and application-specific records are available from the selected manufacturer.

Procurement questions

Does this CAS describe cefazolin sodium?

No. CAS 25953-19-9 is cefazolin free acid.

Can area purity serve as a reference-standard value?

A quantitative standard needs an assigned content and an appropriate certificate scope.

Is a chemical assay the same as biological potency?

They measure different attributes; specify the method required for the intended qualification.

Technical sources
  1. PubChem CAS identity lookupNCBI / PubChem
  2. CefazolinPubChem
  3. Cefazolin EP Reference StandardEDQM / Sigma-Aldrich