Table 2 Retention time, concentration ranges of lineal response and correlation coefficient for standard organic acids
Organic acid standard | Rt (min) | Concentration ranges (ppm) | Equation | R2 |
|---|---|---|---|---|
Oxalic | 3.884 | 1750–350 | Y = 7585.1×-72,810 | 0.9937 |
Tartaric | 4.148 | 5000–1000 | Y = 2914.9×-2758 | 0.9942 |
Ascorbic | 5.295 | 1750–350 | Y = 8327.7×-7497.5 | 0.9921 |
Lactic | 5.857 | 15,000–3000 | Y = 769.58× + 4607 | 0.9939 |
Acetic | 6.334 | 10,000–2000 | Y = 253.82× + 2571 | 0.9991 |
Citric | 6.953 | 10,000–2000 | Y = 405.19× + 1826.9 | 0.9953 |
Succinic | 9.052 | 10,000–2000 | Y = 428.23× + 321.26 | 0.9936 |
Kojic | 11.31 | 500–100 | Y = 56,358×-22,343 | 0.9913 |