Ed. Ramsey et al., DETERMINATION OF THE PRESENCE OF A DIASTEREOMERIC IMPURITY WITHIN A SYNTHETIC PEPTIDE BY COMBINED LIQUID-CHROMATOGRAPHY MASS-SPECTROMETRY TECHNIQUES, Analytical communications, 33(2), 1996, pp. 79-83
The use of two different LC-MS techniques, using moving-belt and conti
nuous-flow FAB, has provided complementary means of determining the pr
esence of a diastereomeric impurity within a protected tripeptide phar
maceutical precursor.