Oxalomalic acid sodium salt is primarily used in biochemical research as a reagent to study metabolic pathways, particularly those involving the tricarboxylic acid (TCA) cycle. It serves as an intermediate in the investigation of enzymatic reactions and cellular respiration processes. Additionally, it is employed in laboratory studies to understand the role of organic acids in energy production and metabolism. Its application extends to the field of enzymology, where it helps in analyzing the activity and mechanisms of specific enzymes involved in organic acid metabolism.