The kit is designed for the antioxidant capacity measurement in biological samples.Background: The ORAC assay depends on the free radical damage to a fluorescent probe, such as fluorescein, to result in a change of fluorescent intensity4 and the degree of change is indicative of the amount of radical damage. The presence of antioxidants results in an inhibition in the free radical damage to the fluorescent compound. This inhibition is observed as a preservation of the fluorescent signal. It is possible quantitate the protection by calculating the area under the curve (AUC) from the experimental sample. After subtracting the AUC for the blank, the resultant difference would be the protection conferred by the antioxidant compound. Trolox®, (6-hydroxy-2,5,7,8-tetrametmethylchroman-2-carboxylic acid) a water-soluble vitamin E analog, is used as the calibration standard and ORAC results are expressed as Trolox® equivalents. The ORAC assay is unique in that because the assay is driven to completion the AUC calculation combines both the inhibition time as well inhibition percentage of free radical damage by the antioxidant into a single quantityCustom Assay Service Available! Please contact us for more information.