(A) SDS-PAGE of the SE-HPLC-isolated
ICG-sOSu-panitumumab (1, 2, and 3). a: samples collected
from SE-HPLC RT 18.5 to 20.5 min. b: samples collected from HPLC RT
19–20 min. (B–C) SDS-PAGE of SE-HPLC-isolated ICG-sOSu-panitumumab
before (c, 2) and after (d, 5) extraction
by ethyl acetate under (B) nonreducing and (C) reducing condition.
Samples were loaded with the same protein level (p) or equal amount
of fluorophore (f). Colloidal blue protein staining and optical imaging
were performed after development. Black arrow, heavy chain; brown
arrow, light chain; blue arrow, free dye; red arrow, desired conjugation
product.