Table 2 Calibration results for each organic acid
Compound | Equation | Regression coefficient | LLQ (μg/mL) | ULQ (μg/mL) | LOD (μg/mL) |
|---|---|---|---|---|---|
Oxalic acid | y =8187.5x - 7954.7 | 0.9988 | 2.87 | 28.71 | 0.50 |
cis-Aconitic acid | y =21093x - 5565.6 | 0.9985 | 0.31 | 124.00 | 0.06 |
Maleic acid | y =84067x - 16233 | 0.9992 | 0.27 | 81.00 | 0.05 |
Glucuronic acid | y =14419x +1094.2 | 0.9993 | 0.53 | 15.60 | 0.11 |
Citric acid | y =20732x +6991.4 | 0.9996 | 0.34 | 102.00 | 0.07 |
Galacturonic acid | y =15778x +7460.2 | 0.9986 | 0.72 | 36.00 | 0.11 |
Gluconic acid | y =12550x +6863.1 | 0.9990 | 0.29 | 58.00 | 0.10 |
Pyruvic acid | y =14707x +10512 | 0.9990 | 0.96 | 48.00 | 0.10 |
Tricarballylic acid | y =26542x +1315 | 0.9998 | 0.28 | 55.44 | 0.05 |
Glyoxylic acid | y =4295.9x +1770.2 | 0.9940 | 1.09 | 19.50 | 0.15 |
Malic acid | y =32279x - 2606.8 | 0.9992 | 0.35 | 70.00 | 0.04 |
Malonic acid | y =29560x - 17152 | 0.9951 | 0.82 | 54.45 | 0.18 |
trans-Aconitic acid | y =12279x +5867.4 | 0.9998 | 0.71 | 47.00 | 0.07 |
Methylmalonic acid | y =34174x - 869.82 | 0.9992 | 0.25 | 9.90 | 0.03 |
Succinic acid | y =26782x +4284.6 | 0.9987 | 0.25 | 24.50 | 0.03 |
Glycolic acid | y =18633x +16302 | 0.9970 | 0.78 | 39.11 | 0.04 |
Lactic acid | y =23633x +25347 | 0.9980 | 0.34 | 34.17 | <0.01 |
Itaconic acid | y =33879x - 2761.6 | 0.9993 | 0.23 | 22.50 | 0.10 |
Glutaric acid | y =34426x - 6184.7 | 0.9988 | 0.23 | 23.27 | 0.10 |
Fumaric acid | y =31579x +19428 | 0.9991 | 0.49 | 98.00 | 0.05 |
2-Hydroxy-2-methylbutyric acid | y =79616x +936.42 | 0.9998 | 0.26 | 50.96 | 0.03 |
Adipic acid | y =29753x - 3138.7 | 0.9996 | 0.23 | 46.00 | 0.05 |
Levulinic acid | y =4245.6x +11213 | 0.9976 | 1.52 | 152.00 | 0.30 |
2-Furoic acid | y =4437.7x +2071.3 | 0.9990 | 2.25 | 45.00 | 0.70 |