Impurity reference standards
Topotecan impurity standards
This page brings together 2 Topotecan related compounds that analytical teams use to identify, quantify and control impurities in the active ingredient and the finished dosage form. The range includes 1 isotope-labelled standard and 1 metabolite or hydroxylated analogue.
2reference materials
1isotope labelled
1metabolites
Each lot ships with a certificate of analysis, and characterisation data such as 1H-NMR, mass spectrum and HPLC purity can be shared before you order. Laboratories use them to validate related-substance methods, set specification limits under ICH Q3A and Q3B, and identify unknown peaks in stability samples.
By impurity type
Isotope labelled1Deuterated, 13C or 15N internal standards
Metabolites1Hydroxy, desmethyl and conjugated forms
Counts are based on product names. One compound can fall into more than one type.
All Topotecan reference materials
1–2 of 2 standards
Questions
Topotecan impurities, answered
What Topotecan reference materials are available?
The catalogue currently lists 2 compounds for Topotecan, including 1 isotope-labelled standard and 1 metabolite or hydroxylated analogue. Each product page shows the CAS number where one is assigned, the structure, formula and molecular weight.
What documents come with a Topotecan impurity standard?
A certificate of analysis travels with every lot. On request we share the characterisation set, usually 1H-NMR, mass spectrum, HPLC purity and IR, and for some materials TGA or water content. Ask for the data before ordering if your QA team needs to review it.
Can Zemixal make a Topotecan impurity that is not listed?
Often yes. Send the structure, name or CAS number with the quantity you need and our sourcing team checks custom synthesis options, usually from 10 mg up to gram scale, with a quoted lead time.
Are isotope-labelled Topotecan standards available?
Yes. 1 stable-isotope labelled compound is listed, suitable as internal standards for LC-MS bioanalysis and trace impurity quantitation.