Vitamins and Coenzymes
The reductant, NADH, transfers the electrons via a flavo-proteins to the specific disulfide (S-S) protein to form a dithiol (SH,SH) protein which converts vitamin

B12(Co) to B12(Co2+)
B12(Co2+)to B12(Co+)
B12(Co2+)to B12(Co)
B12(Co+)to B12(Co2+)

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Vitamins and Coenzymes
The vitamin riboflavin, which occurs as a yellow pigment in egg yolk and milk become

more deep in color on reduction with Zn in acid and regained its color on re-oxidation
colorless on reduction with Zn in acid and regained its color on re-oxidation
colorless on oxidation and regained its color on reduction with Zn in acid
more deep in color on oxidation and regained its color on reduction with Zn in acid

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