Detection and Quantitation of Epimeric Peptides by NMR Spectroscopy

B Weinstein, AE Pritchard. Amino-acids and Peptides. Part XXVIII. Determination of racemization in peptide synthesis by nuclear magnetic resonance spectroscopy. J Chem Soc Perkin Trans 1, 1015, 1972. 

JS Davies, RJ Thomas, MK Williams. Nuclear magnetic resonance spectra of ben-zoyldipeptide esters. A convenient test for racemisation in peptide synthesis. J Chem Soc Chem Commun 76, 1975. 

NL Benoiton, K Kuroda, FMF Chen. A series of lysyldipeptide derivatives for race-mization studies in peptide synthesis. Int J Pept Prot Res 13, 403, 1979. 

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