. Author manuscript; available in PMC: 2011 Jun 14.

Published in final edited form as: Biomacromolecules. 2010 Jun 14;11(6):1429–1436. doi: 10.1021/bm901378a

Table 2. Protein Polymer Contrast Agent Properties with Varying Lysine Spacing and Molecular Weight of 22 kDa.

	K4-30	K6-40	K8-30
Average # of Gd(III) per molecule	14.5	11.5	8.0
# of Lysines per protein	61	41	31
Protein molar mass (kDa)	22.1	21.7	21.7
Conjugation efficiency (%)	23.9	28.0	26.7
Relaxivity per Gd(III) (mM^-1s^-1)	12.1	9.1	8.8
Relaxivity per molecule (mM^-1s^-1)	175.4	104.7	70.5