TABLE 2.

Reactivity of partially purified NADH:quinone oxidoreductase with various electron acceptors

Electron acceptor (concn [mM])	Redox potential (mV)	Extinction coefficient (mM−1 cm−1); wavelength (nm)	TPZ concn (mM)	Sp act of NADH:acceptor oxidoreductase (U/mg)
Duroquinone (0.2)	+35d	NAg	0	52.3
			0.1	20.1
Duroquinone (0.1)	+35d	NA	0	15.7
			0.1	4.02
1,4-Naphthoquinone (0.1)	+64d	NA	0	80.4
			0.1	37.4
Phenazine methosulfate (0.1)	+80c	NA	0	189.3
			0.1	23.7
INT (0.4)	-90a	17.4; 465f	0	68.9
NBT (0.4)	-50a	40.2; 605f	0	0.47
TTC (0.4)	-83,-240,-415b	9.1; 546e	0	41.2
Benzyl viologen (1)	-360d	8.65; 578d	0	456.6
Methyl viologen (1)	-440d	9.7; 578d	0	23.2

^aKarmakar et al. (14).

^bRich et al. (27).

^cDenke et al. (6).

^dBergmeyer (4) and Friedrich and Schink (8).

^eLi et al. (18).

^fAltman (1).

^gNA, not applicable.