Reaction catalyzed by quinoprotein formaldehyde dehydrogenase (cytochrome cL) (1.2.2.B2), aldehyde dehydrogenase (quinone) (1.2.5.2)

		+			=			+
	propionaldehyde	+		oxidized 2,6-dichlorophenolindophenol	=		propionate	+		reduced 2,6-dichlorophenolindophenol