There is one step in glycolysis where glycelrinaldehyde-3-phosphate is oxidized (and simultaneously phosphorylated) to to 1-3-biphosphoglycerate by the enzyme glyceraldehyde phosphate dehydrogenase. read more
Steps 3, 4, 6, and 8 of the citric acid cycle involve the oxidation of the substrate. This is indicated by the involvement of the redox cofactors NAD and FAD. read more