The CAs of different concentration of Thilakoid membrane (a)250 mg/mL, (b)500 mg/mL, (c) 750 mg/mL, (d) 1000 mg/mL) modified P(DTP-Ph-NH2)/ Cyt C electrodes in pH 7.4 PBS upon an on-off illumination of visible light at an intensity of 6800 w/M2, applied potential; 0V (vs Ag/AgCl).