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Fig. 2 (A) MALDI-TOF mass spectra of BSA (black) and dopamine-conjugated BSA (D-BSA) (red) proteins. (B) UV–vis absorption spectra of 1.12 × 10–5 M BSA (black), 1.68 × 10–4 M dopamine (blue), sum of BSA and dopamine (×15 mol) spectra (pink), and 1.12 × 10–5 M D-BSA (red). Dopamine concentration is 15 times that of BSA. (C) ATR-FTIR spectra of BSA (black) and D-BSA (red). (D) Zeta potentials of BSA (black) and D-BSA (red) aqueous solutions at different pH values from 3.0 to 9.0.
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