A number of assays have been introduced for the measurement
of the total antioxidant activity of body fluids
[1– 6], food extracts [7–11], and pure compounds [7,12–
16]. Each method relates to the generation of a different
radical, acting through a variety of mechanisms and the
measurement of a range of end points at a fixed time
point or over a range (reviewed in refs 13 and 17). Two
types of approach have been taken, namely, the inhibition
assays in that the extent of the scavenging by hydrogen-
or electron-donation of a pre-formed free radical
is the marker of antioxidant activity, as well as assays
involving the presence of antioxidant system during the
generation of the radical.
A number of assays have been introduced for the measurementof the total antioxidant activity of body fluids[1– 6], food extracts [7–11], and pure compounds [7,12–16]. Each method relates to the generation of a differentradical, acting through a variety of mechanisms and themeasurement of a range of end points at a fixed timepoint or over a range (reviewed in refs 13 and 17). Twotypes of approach have been taken, namely, the inhibitionassays in that the extent of the scavenging by hydrogen-or electron-donation of a pre-formed free radicalis the marker of antioxidant activity, as well as assaysinvolving the presence of antioxidant system during thegeneration of the radical.
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