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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

Cefoxitin (Free acid) | CAS 35607-66-0

A 7α-methoxy cephamycin in the free-acid form, used in cefoxitin analytical and antibacterial research where chemical assay and biological activity require separate definition.

CAS35607-66-0
Molecular formulaC16H17N3O7S2
Molecular weight427.5 g/mol

Product overview

The 7α-methoxy group is a defining feature of cefoxitin’s cephamycin scaffold. The molecule also carries a carbamoyloxymethyl group and a thiophene-containing acyl side chain. CAS 35607-66-0 refers to the free acid. When selecting material, identify whether a method requires this form, cefoxitin sodium or a formulated assay product, and specify content using the corresponding molecular basis.

Chemical identity

Chemical name
Cefoxitin (Free acid)
CAS number
35607-66-0
Molecular formula
C16H17N3O7S2
Molecular weight
427.5 g/mol

Application context

Cefoxitin appears in antibacterial research and in published studies of susceptibility-testing methods, including work relating cefoxitin responses to mecA in staphylococci. For reagent selection, biological activity and analytical purity answer different questions. A chemically characterized research grade may therefore need additional activity qualification before use in a quantitative microbiological method. Analytical development can focus on identity, assay and a stability-indicating profile, while any diagnostic or pharmaceutical product requires its own defined formulation and release criteria.

Chemistry and synthetic role

The cephamycin beta-lactam, 7α-methoxy configuration and carbamoyloxymethyl substituent are structural checkpoints for identity and degradation review.

Quality review

Cephamycin identity

Confirm the methoxy-bearing stereochemical structure and free-acid form.

Activity versus chemical assay

If the application uses an activity-based concentration, request a suitable potency assignment rather than relying on HPLC area percentage.

Degradation and sample condition

Use a stability-indicating method and agree sample storage, water correction and solution-preparation conditions.

Preparing a specification

State free-acid identity, assay basis, related-substance method, water correction and whether activity assignment is required for the intended research method.

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 HPLC purity establish antibiotic potency?

No. Potency is a separate attribute and needs the relevant assay or assigned value.

Is the free acid the same purchasing form as cefoxitin sodium?

No. The salt form and mass basis differ.

Can raw cefoxitin replace a validated susceptibility-test product?

The test formulation and its performance require independent qualification.

Technical sources
  1. PubChem CAS identity lookupNCBI / PubChem
  2. CefoxitinTCI
  3. Results of disk diffusion testing with cefoxitin correlate with presence of mecA in Staphylococcus spp.Journal of Clinical Microbiology