D-gluconate + FAD + H(+) <=> 2-dehydro-D-gluconate + FADH2
d-gluconate + fad + h(+) <=> 2-dehydro-d-gluconate + fadh2
D-gluconate + FAD + H(+) <=> 2-dehydro-D-gluconate + FADH2
d-gluconate + fad + h(+) <=> 2-dehydro-d-gluconate + fadh2