AssayIndex
Impurities & degradation

Epimerisation

Inversion of a single stereocentre during synthesis, typically during carboxyl activation. Produces a diastereomer.

Related terms

Diastereomer
A stereoisomer arising from inversion at one chiral centre. Same formula, same mass, same UV spectrum, often much less active. The impurity no mass spectrum finds.
Racemisation
Loss of stereochemical purity toward a 50:50 mixture. In stepwise peptide synthesis the practical concern is epimerisation at individual residues.
see also Epimerisation

Where this term appears

The glossary exists to make record pages readable without a chemistry degree. Every technical term on a report resolves here.