Table 2.
Analytical recoveries of organic acids from spiked urine sample extracted by liquid–liquid extraction and solid phase extraction
| Compound | Liquid–liquid extraction | Solid phase extraction | ||
|---|---|---|---|---|
| Mean recovery (%) | CV (%) | Mean recovery (%) | CV (%) | |
| Propionylglycine | 52.08 | 8.8 | 61.12 | 10.6 |
| Butrylglycine | 81.26 | 6.2 | 81.46 | 6.2 |
| Isovalerylglycine | 63.86 | 11.8 | 65.06 | 6.2 |
| 3-Methyl crotonylglycine | 75 | 12.4 | 75.96 | 10.6 |
| Tiglylglycine | 65.9 | 14.5 | 77.16 | 16.2 |
| Hexanoylglycine | 44.82 | 8.9 | 53.7 | 8.3 |
| Methylmalonic acid | 99.0 | 9.0 | 99.6 | 2.7 |
| Fumaric acid | 75.25 | 7.9 | 96.25 | 18.5 |
| Succinylacetone | 67.75 | 10.6 | 93.4 | 16.2 |
| Glutaric acid | 100.5 | 6.8 | 99.6 | 8.3 |
| Adipic acid | 83.25 | 6.4 | 101 | 18.4 |
| Sebacic acid | 98.25 | 3.6 | 93.4 | 16.6 |
| Suberic acid | 105.75 | 5.4 | 111.0 | 11.5 |
| 2-Ketoisocaproic acid | 70.6 | 9.8 | 68.9 | 10.9 |
| Mean | 77.4 | 8.7 | 84.1 | 11.5 |