Compound as reactive (1)
menadione + NADH + H+ → menadiol + NAD+
Compound as product (2)
2 menadiol + oxygen → 2 menadione + 2 H2O
phylloquinone + H2O → menadione + phytol
Reversible reaction (1)
hydrogen peroxide + menadiol ↔ 2 H2O + menadione