LC-QTOF-MS Analysis and Activity Profiles of Popular Antioxidant Dietary Supplements in Terms of Quality Control

Figure 4

The Pearson’s correlations between results obtained using different antioxidant activity tests and total polyphenol content (TPC). (a) ORAC versus TPC, (b) DPPH versus TPC, and (c) ABTS versus TPC.

(a)

(b)

(c)