O. Hofstetter et al., An immunochemical approach for the determination of trace amounts of enantiomeric impurities, CHEM COMMUN, (17), 2000, pp. 1581-1582
The application of stereoselective antibodies in an enzyme immunoassay enab
les the quantitative determination of enantiomeric impurities beyond the ou
ter limits of currently available methods; thus, using an antibody raised a
gainst a derivative of d-phenylalanine, the d-enantiomer of the free amino
acid can be detected in a 100000 fold excess of the L-enantiomer (ee 99.998
%).