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Quercetin impurities and related standards

Quercetin is held here as a working collection of 37 reference materials across 21 CAS numbers. 22 entries carry a verified structure drawing, a coverage of 60%; the rest are listed without a structure rather than with an unverified one. 18 of them sit in tier A or B, meaning the data behind the page is complete enough to be indexed and quoted directly, while 19 remain tier C and are kept for search coverage. The labelled members of this group are used as internal standards, which puts the isotopic distribution at the centre of the specification rather than at its edge: the label position and the enrichment have to be stated, and a co-eluting unlabelled fraction changes the result even when the chemical purity looks acceptable. 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) - QUERCETIN 1540 (QUERCETIN) LIQUID [PROFESSIONAL COMPLEMENTARY HEALTH FORMULAS].

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

In this group: 14 fine chemicals · 7 stable isotope labelled standards · 1 pharmaceutical intermediate · 1 impurity reference standard. CAS numbers are listed for 23 of 23; 23 entries carry a structure drawing.

On this page

23 reference standards

All entries — structure, identifiers and pack sizes

23 reference standards

Frequently asked

How many Quercetin-related reference standards do you hold?
23 standards are listed on this page as of the latest catalogue build. CAS numbers are published for 23 of them and 23 entries carry a structure drawing. The catalogue is extended as new lots are released.
Can you supply a Quercetin 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 Quercetin 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 Quercetin 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.