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The calibration curves of gallic acid (1, 5, 10, 15, 20, and 25 ppm) towards various DPPH concentrations for the antioxidant sensor (n=3).
| DPPH conc. (ppm) | r2 | Equation of calibration curve | Slope |
|---|---|---|---|
| 50 | 0.9873 | y=3.2809x+0.4224 | 3.2809 |
| 100 | 0.9911 | y=3.3118x−1.1945 | 3.3118 |
| 125 | 0.9922 | y=3.4257x−3.3301 | 3.4257 |
| 150 | 0.9912 | y=3.2353x−1.3858 | 3.2353 |
