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Journal of Analytical Science and Technology

Table 3 Deviations from baseline concentrations of VMA for endogenous potential interferences

From: A new approach for urinary vanillylmandelic acid determination using eVol microextraction by packed sorbent coupled to liquid chromatography-tandem mass spectrometry

Substances

Test concentration(μg/mL)

VMA mean(μg/mL)

VMA determined (μg/mL)

VMA deviation (%)

Tryptophan

200

2.93

2.8

− 4.4

15.8

16.1

1.9

Phenylalanine

200

15.8

17

7.6

15.8

17.2

8.9

Tyrosine

1000

2.93

2.81

− 4.1

15.8

16.8

6.3

Melatonin

165

2.93

2.8

− 4.4

15.8

14.6

− 7.6

Uric acid

500

2.93

2.7

− 7.9

15.8

15.8

0.0

Ascorbic acid

200

2.93

2.98

1.7

15.8

16.5

4.4

Urea

2000

2.93

2.82

− 3.8

15.8

15.5

− 1.9

Glucose

2000

2.93

3.06

4.4

15.8

16.3

3.2

Riboflavin

108

2.93

3.21

9.6

15.8

15.5

− 1.9

4-OH-3-methoxyphenyl glycol

1000

2.93

3.02

3.1

15.8

15

− 5.1

5-Hydroxytryptophol

100

2.93

3.27

11.6

15.8

16.5

4.4

Nicotinamide

500

2.93

2.7

− 7.9

15.8

15.5

− 1.9

Pyridoxal 5-phosphate

500

2.93

3.04

3.8

15.8

15.4

− 2.5

Thiamine

200

2.93

2.87

− 2.1

15.8

16.2

2.5

Nicotinurirc acid

200

2.93

2.85

− 2.7

15.8

14.6

− 7.6

Nicotinic acid

200

2.93

2.82

− 3.8

15.8

15.7

− 0.6

Pyridoxal

200

2.93

2.84

− 3.1

15.8

15.3

− 3.2

5-Hydroxyindoleacetic acid

100

2.93

2.87

− 2.1

15.8

15

− 5.1

Metanephrine

100

2.93

3

2.4

15.8

15.9

0.6

3-Methoxytyramine

200

2.93

2.92

− 0.3

15.8

14.8

− 6.3

Norepinephrine

100

2.93

2.86

− 2.4

15.8

15.2

− 3.8

Normetanephrine

100

2.93

2.9

− 1.0

15.8

15.4

− 2.5

3,4-Dihydroxymandelic acid

1000

2.93

3.25

10.9

15.8

14.8

− 6.3

3,4-Dihydroxyphenylacetic acid

1300

2.93

3.12

6.5

15.8

16.2

2.5

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