![]() On the other hand, there are indirect assays, such as the ferric reducing ability of plasma (FRAP), and the cupric reducing antioxidant capacity (CUPRAC), which are based on determination of the ability of a sample to reduce a metal complex. ![]() The oxygen radical absorbance capacity (ORAC) assay is another direct assay described. One of the most commonly used direct assays is the Trolox (6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid) equivalent antioxidant capacity (TEAC) with modifications mainly based on period of time used for measurement, and radical formed. Classification of different TAC assaysĪssays to measure TAC can be direct, which are based on the ability to inhibit the oxidation of a substance. Total antioxidant capacity (TAC) is the measure of the amount of free radicals scavenged by a test solution, being used to evaluate the antioxidant capacity of biological samples.
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