Table 1. Differential metabolites identified by GC-MS assay.
| Metabolite | RI | Q.ion.mz. | RT.s. | vip | p value | q value | fold_change |
|---|---|---|---|---|---|---|---|
| 2-Hydroxyglutaric acid | 1588.9 | 129.0 | 802.6 | 1.57 | 4.79E-13 | 4.50E-11 | −2.63 |
| Pyruvic acid | 1070.7 | 174.0 | 377.4 | 1.57 | 1.25E-12 | 1.16E-10 | −1.51 |
| Citric acid | 1843.5 | 273.1 | 970.8 | 1.50 | 4.92E-08 | 4.18E-06 | −1.43 |
| 4-Hydroxybutanoic acid | 1245.7 | 233.1 | 534.9 | 1.55 | 2.14E-10 | 1.90E-08 | −0.84 |
| Oxalic acid | 1147.6 | 45.0 | 446.4 | 1.57 | 7.88E-12 | 7.17E-10 | −0.80 |
| Aconitic acid | 1760.9 | 229.1 | 918.4 | 1.40 | 7.89E-06 | 6.23E-04 | −0.75 |
| Glyceric acid-3-phosphate* | 1833.5 | 357.1 | 964.4 | 1.15 | 1.57E-03 | 9.54E-02 | −0.60 |
| Uric acid* | 2130.3 | 441.2 | 1137.0 | 1.44 | 1.36E-06 | 1.10E-04 | −0.56 |
| Lactic acid | 1083.1 | 191.0 | 388.3 | 1.57 | 1.55E-12 | 1.43E-10 | −0.54 |
| Glucose-6-phosphate* | 2371.2 | 205.0 | 1260.6 | 1.09 | 3.46E-03 | 1.97E-01 | −0.54 |
| 2-methyl-Fumaric acid | 1361.9 | 184.0 | 631.6 | 1.16 | 1.31E-03 | 8.12E-02 | −0.54 |
| Inosine | 2604.6 | 230.1 | 1371.0 | 1.33 | 6.25E-05 | 4.69E-03 | −0.52 |
| Tryptophan* | 2227.6 | 202.1 | 1188.4 | 1.43 | 2.57E-06 | 2.06E-04 | −0.52 |
| Lysine* | 1865.7 | 174.1 | 984.3 | 1.29 | 1.34E-04 | 9.24E-03 | −0.43 |
| 3-Hydroxypropanoic acid | 1158.4 | 177.0 | 457.7 | 1.46 | 7.21E-07 | 5.99E-05 | −0.31 |
| Threitol* | 1529.4 | 103.0 | 760.0 | 1.36 | 2.59E-05 | 1.99E-03 | −0.28 |
| Threonic acid* | 1565.6 | 292.1 | 786.3 | 1.13 | 2.05E-03 | 1.23E-01 | −0.23 |
| Alanine* | 1122.7 | 116.1 | 424.0 | 1.31 | 8.47E-05 | 6.18E-03 | −0.17 |
| Serine* | 1379.6 | 204.1 | 644.1 | 1.29 | 1.43E-04 | 9.75E-03 | −0.12 |
| Malic acid* | 1505.8 | 233.1 | 742.3 | 1.31 | 9.55E-05 | 6.87E-03 | −0.12 |
| Threonine* | 1403.3 | 117.0 | 663.9 | 1.22 | 4.97E-04 | 3.23E-02 | −0.06 |
| Adenine | 1882.3 | 264.1 | 994.6 | 1.37 | 1.62E-05 | 1.27E-03 | 0.24 |
| Guanosine | 2857.1 | 324.1 | 1461.5 | 1.07 | 4.21E-03 | 2.32E-01 | 0.25 |
| Phosphoric acid | 1292.4 | 299.1 | 574.1 | 1.12 | 2.30E-03 | 1.36E-01 | 0.25 |
| Gluconic acid | 2004.4 | 333.1 | 1066.6 | 1.19 | 9.21E-04 | 5.89E-02 | 0.29 |
| Homoserine | 1463.5 | 183.0 | 711.4 | 1.27 | 2.11E-04 | 1.41E-02 | 0.33 |
| Nicotinic acid | 1302.5 | 180.0 | 583.5 | 1.30 | 1.12E-04 | 7.96E-03 | 0.35 |
| Ketoglutaric acid* | 1811.4 | 292.1 | 950.6 | 1.31 | 8.24E-05 | 6.10E-03 | 0.39 |
| 1,6-Anhydro-beta-D-glucose | 1727.1 | 217.1 | 896.1 | 1.27 | 2.13E-04 | 1.41E-02 | 0.43 |
| Cholesterol | 3183.6 | 129.0 | 1633.2 | 1.18 | 1.01E-03 | 6.38E-02 | 0.48 |
| 9-(Z)-Hexadecenoic acid | 2027.9 | 311.2 | 1079.9 | 1.53 | 4.99E-09 | 4.29E-07 | 0.48 |
| Adenosine | 2666.9 | 236.1 | 1398.8 | 1.45 | 9.45E-07 | 7.75E-05 | 0.51 |
| Mannitol* | 1975 | 205.1 | 1048.8 | 1.53 | 2.20E-09 | 1.91E-07 | 0.61 |
| Monomethylphosphate | 1193.0 | 241.0 | 489.3 | 1.30 | 1.21E-04 | 8.47E-03 | 0.71 |
| Adenosine-5-monophosphate | 3112.8 | 230.1 | 1594.3 | 1.34 | 4.72E-05 | 3.59E-03 | 0.76 |
| Uracil | 1350.7 | 241.0 | 622.9 | 1.56 | 1.19E-11 | 1.07E-09 | 0.82 |
| Cysteine* | 1570.3 | 220.1 | 789.5 | 1.54 | 1.29E-09 | 1.14E-07 | 0.99 |
| N,N-Di-(2-Hydroxyethyl)-methanamine | 1433.1 | 160.0 | 690.1 | 1.11 | 2.78E-03 | 1.61E-01 | 1.09 |
| Aspartic acid* | 1535.0 | 232.1 | 765.1 | 1.58 | 8.32E-14 | 7.91E-12 | 1.15 |
| Inositol-1-phosphate | 2468.5 | 318.1 | 1308.1 | 1.46 | 5.76E-07 | 4.83E-05 | 1.45 |
| Malonic acid | 1174.4 | 191.0 | 475.0 | 1.07 | 4.14E-03 | 2.32E-01 | 2.59 |
Note: RI, retention index; Q.ion.mz, quantitative ion; RT.s, retention time/second; vip, PLS-DA first principal component variable importance in projection; pvalue, t-test significance; Qvalue, false-positive correction of t-test significance; fold_change, logarithm of Per-KD/WT fold change (fold change >0 means WT > Per-KD; fold change < 0 means WT < Per-KD). Metabolites with “*” were verified by standards.