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Cephalexin impurities and related standards

Cephalexin is held here as a working collection of 61 reference materials across 9 CAS numbers. 27 of the entries are impurity-type materials of the parent, 7 are salt or counter-ion variants and 6 carry a deuterium label. 11 entries carry a verified structure drawing, a coverage of 18%; the rest are listed without a structure rather than with an unverified one. 11 of them sit in tier A or B, meaning the data behind the page is complete enough to be indexed and quoted directly, while 50 remain tier C and are kept for search coverage. Because these are degradation and process impurities of a single parent, the useful comparison between suppliers is not the headline count but which letters are actually covered and whether each one arrives with a structure and a stated content basis. Co-elution with the parent is the trap in a series this closely related, so the useful certificate data are the retention time under a named method and the relative retention, not a purity figure alone.

Sources: DailyMed (US NLM) - CEPHALEXIN CAPSULE [REMEDYREPACK INC.].

17 reference standards related to Cephalexin held in the RSSE catalogue — pharmacopoeial impurities, non-compendial impurities, metabolites and labelled analogues where available.

In this group: 5 fine chemicals · 5 impurity reference standards · 3 stable isotope labelled standards · 1 general reference standard. CAS numbers are listed for 17 of 17; 17 entries carry a structure drawing.

On this page

17 reference standards

All entries — structure, identifiers and pack sizes

17 reference standards

Frequently asked

How many Cephalexin-related reference standards do you hold?
17 standards are listed on this page as of the latest catalogue build. CAS numbers are published for 17 of them and 17 entries carry a structure drawing. The catalogue is extended as new lots are released.
Can you supply a Cephalexin impurity that is not listed here?
Yes. Non-compendial impurities can be quoted from a structure — a CAS number is not required. Send the structure, a SMILES string or the parent drug substance with your enquiry and we will come back with availability.
What documentation is supplied with Cephalexin impurities?
Every lot ships with its own certificate of analysis. The certificate records the catalogue number, the batch number, the tests performed, the specification applied and the result obtained for that lot. A safety data sheet is supplied with the shipment.
Do you publish prices or a lead time for Cephalexin impurities?
No price list is published: quotations are prepared per enquiry, because availability and packing depend on the lot and the quantity you need. Send the catalogue number and the quantity and a technical contact will answer with availability and a quotation.

Cannot find the impurity you need? Non-compendial impurities can be quoted from a structure — a CAS number is not required. Write to sales@rssechem.com.