Screening of Polyphenols in Tobacco (<i>Nicotiana tabacum</i>) and Determination of Their Antioxidant Activity in Different Tobacco Varieties.

58 Furthermore, a highly significant positive correlation has been found between TCT and DPPH with Pearson’s correlation coefficient r = 0.79 ( P < 0.01), which revealed the same trend in the studies of Li et al. 59 and Wang et al. 60 The reason is that the phenolic compounds in tobacco are able to offer H to DPPH free radicals to form DPPH-H. 59 The TPC assay was detected having a significant positive correlation with antioxidant activity including ABTS, DPPH, and FRAP. 61 However, these correlations did not reach a significant level in this study.

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