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Linear regression parameters for the calibration curves of caffeine. The data are presented as mean ± standard deviation (SD). The LOD and LOQ were determined based on the standard deviation of the intercept and the slope of the calibration curve.
| Parameters | Values |
|---|---|
| Slope | 2485.90 ± 138.03 |
| Intercept | −1952.17 ± 3181.42 |
| R2 | 0.994 |
| Adjusted R2 | 0.991 |
| LOD (μg/mL) | 4.22 |
| LOQ (μg/mL) | 12.66 |
