MALDI-ToF MS data corroborates the functionalization of PSar with the low molecular weight nucleophiles (Figure ). In the mass spectra of the α-benzylamine-PSar , signals attributed to the desired product featuring an amine ω-terminus and sodium (γ) and potassium (α) ion doping, respectively (Figure ), are observed. We also observed signals that can be attributed to oxidized PSar with proton (δ) ion doping. Signals at m/z = 3711 could be attributed to the PSar starting material that underwent fragmentation and sodium (β) ion doping. Signals suggesting the presence of PSar with a hydrolyzed MTP ester and sodium ion doping (ε) were also detected.