Which electron carrier(s) function in the citric acid cycle?

NADH and FADH2 are the electron carriers which contain most of the energy extracted from Glucose, the original energy source. This energy was the result during the processes of glycolysis and the citric acid cycle. In short, most of the energy in a cell flows from Glucose to NADH, to the electron transport chain to a proton-motive force to Adenosine Triposphate (ATP).