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Preservative impurities and related standards

Preservative is held here as a working collection of 12 reference materials across 12 CAS numbers. 12 entries carry a verified structure drawing, a coverage of 100%. 12 of them sit in tier A or B, meaning the data behind the page is complete enough to be indexed and quoted directly. Materials of this kind are used as building blocks, reagents and analytical references rather than as degradants of one drug, so the questions that decide usability are different: batch-to-batch consistency, the water and counter-ion content the certificate has to state, and whether the structure on the page was verified rather than copied from a name. Where the same compound is offered in more than one salt or hydrate form, the form as drawn is part of the identity, and a certificate that does not name it leaves the buyer guessing at the molecular weight. The counts above describe what is actually held rather than what a general catalogue claims, so the group can be quoted directly against a specification.

Sources: DailyMed (US NLM) - FRESHKOTE PRESERVATIVE FREE LUBRICANT EYE DROPS (POVIDONE, POLYVINYL ALCOHOL SOLUTION) SOLUTION/ DROPS [HARROW.

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

In this group: 7 stable isotope labelled standards · 3 fine chemicals · 1 general reference standard · 1 chemical reagent. CAS numbers are listed for 12 of 12; 12 entries carry a structure drawing.

On this page

12 reference standards

All entries — structure, identifiers and pack sizes

12 reference standards

Frequently asked

How many Preservative-related reference standards do you hold?
12 standards are listed on this page as of the latest catalogue build. CAS numbers are published for 12 of them and 12 entries carry a structure drawing. The catalogue is extended as new lots are released.
Can you supply a Preservative 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 Preservative 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 Preservative 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.