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. 2016 Aug 12;11(8):e0160256. doi: 10.1371/journal.pone.0160256

Table 1. Various complex species formed at the appropriate pH (values given in brackets), determined on the basis of spectroscopic and potentiometric measurement [13] (the pH value for Cu(II)-NSAAY-NH2 4N complex was estimated on the basis of UV-Vis spectra measured in the present work).

peptide 4N(O)- 4N 3N 2N 1N
AAAAA-NH2 CuH-3L (11.0) CuH-2L (8.0) CuH-1L (6.5) CuL (5.5)
NSFRY-NH2 CuH-3L (11.0) CuH-2L (9.0) CuH-1L (6.7) CuL (6.0) CuHL (5.0)
NSFRA-NH2 - CuH-3L (9.0) CuH-2L (7.1) CuH-1L (6.0) CuL (5.0)
NSAAY-NH2 CuH-3L CuH-2L (9.0) CuH-1L CuL CuHL