Reaction catalyzed by ferric-chelate reductase (NADH) (1.16.1.7)

		+			=			+
	4,7-diphenyl-1,10-phenanthroline-disulfonic acid	+		Fe(III)-ethylene diamine tetraacetic acid	=		Fe(II)-tri-4,7-diphenyl-1,10-phenanthroline-disulfonic acid	+		ethylene diamine tetraacetic acid