Table 1 Retention times of mixed standards peaks detected by LC-MS.

From: Global metabolomics reveals potential urinary biomarkers of esophageal squamous cell carcinoma for diagnosis and staging

Compounds

LC-(+)ESI-MS

Rt (min)

RSD (%)

Peak Area (×105)

RSD (%)

L-Carnitine

1.4

0.86

9.788

5.01

Phenylalanine

2.9

0.16

6.415

2.44

Hippuric acid

8.2

1.50

3.170

2.56

Hydrocortisone

15.0

0.51

18.375

4.20

Estrone

17.4

0.2

0.317

11.14

LC-(−)ESI-MS

Phenylalanine

2.9

1.22

1.569

4.33

Hippuric acid

7.5

2.56

5.916

3.47

Tryptophan

5.1

0.86

1.674

4.02

Cholic acid

13.5

0.52

1.406

10.35

Linoleic acid

20.9

0.38

8.785

5.26

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