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Impurity reference standards

Caffeine impurity standards

For Caffeine, the Zemixal catalogue holds 17 impurity and reference standards that support release testing, stability programmes and regulatory dossiers. Counted by type, there are 5 pharmacopoeial impurities, 3 nitrosamines and 2 isotope-labelled standards.

17reference materials
5pharmacopoeial
3nitrosamines
2isotope labelled

Batches are supplied with a certificate of analysis, and the supporting spectra can be sent ahead of a purchase order so your QA team can review them. Laboratories use them to validate related-substance methods, set specification limits under ICH Q3A and Q3B, and identify unknown peaks in stability samples. For nitrosamine risk evaluation, the N-nitroso standards allow confirmatory LC-MS testing against the acceptable intake limits.

By impurity type

Pharmacopoeial5EP, USP, BP or JP named impurities
Nitrosamines3N-nitroso impurities for ICH M7 work
Isotope labelled2Deuterated, 13C or 15N internal standards

Counts are based on product names. One compound can fall into more than one type.

All Caffeine reference materials

1–17 of 17 standards
Questions

Caffeine impurities, answered

What Caffeine reference materials are available?
The catalogue currently lists 17 compounds for Caffeine, including 5 pharmacopoeial impurities, 3 nitrosamines and 2 isotope-labelled standards. Each product page shows the CAS number where one is assigned, the structure, formula and molecular weight.
What documents come with a Caffeine 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 Caffeine 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.
Do you supply Caffeine nitrosamine impurities?
Yes. 3 N-nitroso compounds are listed for Caffeine. They are used for confirmatory testing and method validation in line with ICH M7 and the nitrosamine guidance from the major regulators.
Are isotope-labelled Caffeine standards available?
Yes. 2 stable-isotope labelled compounds are listed, suitable as internal standards for LC-MS bioanalysis and trace impurity quantitation.

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