Sinapic acid DPPH radical scavenging

FIGURE 15.13 DPPH radicals scavenged with 70% methanolic extract of commercial meals. Right to left mustard Delhi, mustard Manipur, meals X, Y, A (non-specified), husk meal, second-pressed first-pressed solvent-extracted and cold-pressed meals. From the same company. Radicals scavenged by phenolic constituents sinapoyl glucose (SG), sinapine (SP), sinapic acid (SA) and rest from un-identified (non-identified) phenolic constituents. 

To scavenge 25 x 10 DPPH radicals, the required concentrations (mM) for sinapic acid, sinapoyl glucose and sinapine cation were 30.8, 35.8 and 47.5 mM, respectively, compared to 21.5 mM for Trolox, a water-soluble antioxidant. 

Thiyam et al. (2006a) were the first to compare the free radical scavenging activity of test compounds sinapic acid with sinapine and sinapoyl glucose using the DPPH... 

Free radical scavenging activities of different phenolic acids, caffeic acid (CA), ferulic acid (FA) and p-coumaric acid (p CA) and natural antioxidants alpha tocopherol (alpha-toco) and BHA a synthetic antioxidant were compared with sinapic acid (SA). As indicated in Figure 15.10 under the tested conditions, the radical scavenging activity of the phenolic acids in the DPPH system decreased in the following order ... 

---