a beam or bar shaped like the letter T. Thiobarbituric acid reactive substances (TBARS) are formed as a byproduct of lipid peroxidation which can be detected by the TBARS assay using thiobarbituric. Thiobarbituric acid reactive substance (TBARS) assay is another method to detect lipid oxidation. In experimental colitis induced by TNBS, the levels of NO and of thiobarbituric acid-reactive substances (TBARS, a marker of lipid peroxidation) were found to be. : a ski lift having a series of T-shaped bars each of which pulls two skiers. This kit is designed to measure Thiobarbituric Acid Reactive Substances (TBARS ) generated during oxidative stress.