Figure 3. Pharmacokinetic Analysis of PEG-Peptides as a Function of Lys Repeat.
A 1 nmol (0.6 μCi) dose of 125I-PEG-peptide was administered via the tail vein of triplicate mice. At time points of 1–8 hrs, 10 μl of blood was serially sampled from the tail vein and directly gamma counted to determine the concentration 125I-PEG-peptide in blood. The data were fit via Phoenix WinNonlin to determine the β-half-life.