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Validation parameters for antioxidant determination by spectrophotometry.
| Linear Equation | R2 | Coefficient Linearity (%) | LOD (μg/mL) | LOQ (μg/mL) | Repeatability (%RSD) | Reproducibility (%RSD) | |
|---|---|---|---|---|---|---|---|
| Total polyphenols | 0.0022x + 0.0036 | 0.9949 | 99 | 1.0 | 3.0 | 8.5 | 9.0 |
| Total flavonoids | 0.0036x + 0.0018 | 0.9987 | 96 | 2.0 | 2.0 | 5.5 | 6.5 |
| Total proanthocyanidins | 0.0058x + 0.0015 | 0.9965 | 93 | 1.0 | 1.0 | 6.8 | 7.3 |
| FRAP assay | 0.0069x − 0.00036 | 0.9997 | 98 | 1.0 | 1.0 | 2.8 | 3.2 |
