Component parameter | Nicotinamide | Tretinoin | ||
---|---|---|---|---|
Wavelength (nm), Dev order | 253, D1 | 245, D2 | 269, D2 | 348, D0 |
Linearity-range (μg/mL) | 10–80 | 20–120 | 10–120 | 0.5–5.0 |
Regression equation | y = 0.0068x + 0.0050 | y = 0.0022x + 0.0037 | y = 0.0061x—0.0028 | y = 0.1556x + 0.0003 |
Correlation coefficient r2 | 0.9996 | 0.9998 | 0.9999 | 0.9999 |
LOD μg/mL | 4.50 | 5.60 | 1.50 | 0.007 |
LOQ μg/mL | 13.60 | 16.80 | 4.30 | 0.021 |