Fig. 8.

Raman spectroscopy analysis of CNT incubated in media presenting various acidity. Panel a I_D/I_G ratio calculated from Raman spectra of S-, SF-, L-, or LF-CNT incubated for 48 h in culture medium in presence or absence of Concanamycin A. Panel b I_D/I_G ratio calculated from Raman spectra of S-, SF-, L-, or LF-CNT incubated for 48 h in the supernatant of cells cultured in presence or absence of Concanamycin A. Panel c I_D/I_G ratio calculated from Raman spectra of S-, SF-, L-, or LF-CNT incubated for 48 h in artificial medium which pH was set-up at 7.2, 6, or 4.5. Panel d I_D/I_G ratio calculated from Raman spectra of S-, SF-, L-, or LF-CNT incubated for 48 h in culture medium in presence or absence of H₂O₂. Abbreviations as in Fig. 1. Data are given as mean ± SEM of minimum 5 values