Reaction catalyzed by glucose 1-dehydrogenase (FAD, quinone) (1.1.5.9)

		+			=		maltotetraono-1,5-lactone	+
	maltotetraose	+		2,6-dichlorophenolindophenol	=		maltotetraono-1,5-lactone	+		reduced 2,6-dichlorophenolindophenol