Impurity reference standards
Cystine impurities & reference standards
Characterised Cystine impurities, degradation products and related compounds for analytical method development, validation, QC release and regulatory filings.
4reference materials
1isotope-labelled
COAHPLC · NMR · MS on request
FAQs — Cystine impurities
Which Cystine impurities do you supply?
We list 4 Cystine-related reference materials, including process impurities, degradation products, stable-isotope-labelled standards and related compounds. Each is supplied with a COA, and characterisation data (HPLC, 1H-NMR, MS, IR) can be provided on request.
What are Cystine impurity standards used for?
They are used for analytical method development and validation, impurity identification and quantification, forced-degradation and stability studies, and to support ANDA, DMF and other regulatory submissions under ICH Q3A/Q3B (and ICH M7 for mutagenic impurities).
Can you synthesise a Cystine impurity that is not listed?
Yes. Our custom synthesis service can prepare and characterise unlisted impurities, metabolites and labelled analogues from milligram to gram scale. Share the structure or name and required quantity for a quotation.
Request Cystine impurity standards
We reply within one business day with price, pack options, lead time and documentation.