Vitamins and Coenzymes
The occurrence of metals such as iron or molybdenum in some flavoproteins can

form chelation
all of these
de-stabilize the semiquinone
stabilize the semiquinone

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

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