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A simple, cheap and rapid colorimetric method to determine the total amount of orthohydroxyphenolic compounds (TOHPC) as the effective antioxidant agents in food and natural products samples using ferric chloride (FeCl 3 ) reagent was developed. The developed assay shows good linearity, reproducibility, LOD and LOQ. In addition, the performance of the method was validated against the conventional assay by analyzing the total amount of phenolic content (TPC) of twenty tea samples. Similarly, adoi:10.1016/j.arabjc.2021.102986 fatcat:yc3vlaqunfeoza6ii74cucani4