The CRAC assay is a direct electron transfer test of antioxidant capacity for several organic compounds. The ability of eight different compounds in reducing Ce 4+ was studied by chronoamperometric measurements of the remaining Ce 3+ species. The following antioxidant classification was observed: tannic acid quercetin>rutin>gallic acid≈catechin>ascorbic acid>BHA>Trolox. These results agree with others already published and a good correlation ( R 2 =0.937) was found with the classical spectrophotometric FRAP assay. The CRAC assay is simple, fast, free from sample pretreatment and applicable to nontransparent samples.
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Ferreira et al. (2008) studied this question.
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