Cytotoxicity of Protein-Carbon Nanotubes on J774 Macrophages Is a Functionalization Grade-Dependent Effect

Figure 2

Infrared spectra of different CNTs. Infrared spectra obtained from P46P-CNTs (a) and P46S-CNTs (b) where the green boxes show the 6 principal amide-bands at 3300 cm⁻¹ (Amide A), 3100 cm⁻¹ (Amide B), 1650 cm⁻¹ (Amide I), 1550 cm⁻¹ (Amide II), 1300 cm⁻¹ (Amide III), and 725 cm⁻¹ (Amide V); the yellow box represents amino acid specific signals at 1630–1000 cm⁻¹.

(a) P46P-CNTs (precipitate)

(b) P46S-CNTs (supernatant)