Development of an enantiomeric separation of d & l valine as their corresponding isoindole adducts by RP-HPLC for utilization of the l-valine toward pharmaceutically relevant materials

Abstract

The utilization of L-valine for its chiral centre is increasing in the fine chemical, biologic, and pharmaceutical sectors. Therefore, a simple and reliable chirality procedure is needed to assure that trace levels of D-valine are not present. The present work is aimed at the development of a RP-HPLC method which can quantify D-valine to the 0.05% chiral impurity level within L-valine. Several method development and regulatory aspects are discussed, as well as method applicability to other related amino acids (alanine, norvaline, isoleucine, ieucine, and tert-leucine).