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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