Fig. 5: Heterogeneous regeneration of the coenzymes in DMUiO.

a Scheme of the regeneration of NAD+/NADH catalyzed by ADH and LDH. The insets are digital pictures of the NAD+ (left) and NADH (right) solutions under UV light. b Fluorescence spectra of the NAD+@ADH@DMUiO-40 system after the addition of ethanol. c Scheme of the regeneration of NAD+/NADH catalyzed by LDH and diaphorase. d UV-Vis absorption of the LDH@diaphorase@NAD+@DMUiO system after the addition of L-lactic acid at different time. The inset in (d) shows the digital picture to directly illustrate color change of the reaction solution.