Fig. 5. Oxygen concentration measurements. Reactions conditions: [HOBiB]/[EYH₂]/[CuBr₂]/[TPMA] = 1/0.01/0.2/0.6, [HOBiB] = 1.5 mM, in PBS with DMSO (10% v/v), irradiated for 30 min under green LEDs (520 nm, 9.0 mW cm⁻²) in an open vial with stirring at 500 rpm.