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Table 2 Deviations from baseline concentrations of VMA for exogenous 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 (%)
Theobromine 100 2.93 2.87 − 2.0
15.8 15.1 − 4.4
Acetaminophen 200 2.93 3.05 4.1
15.8 16.2 2.5
Labetalol 100 2.93 2.76 − 5.8
15.8 16 1.3
Amitriptyline 10 2.93 2.7 − 7.9
15.8 14.9 − 5.7
Pseudoephedrine 10 2.93 2.79 − 4.8
15.8 15.6 − 1.3
Diphenhydramine 10 2.93 2.96 1.0
15.8 15.4 − 2.5
Theophylline 100 2.93 2.9 − 1.0
15.8 17 7.6
Carbidopa 100 2.93 2.84 − 3.1
15.8 17.4 10.1
Levodopa 100 2.93 2.89 − 1.4
15.8 16 1.3
Salicylic acid 1000 2.93 3.18 8.5
15.8 16 1.3
Clonidine 10 2.93 3.13 6.8
15.8 17.3 9.5
Isoetharine 100 2.93 2.85 − 2.7
15.8 17.8 12.7
Isoproterenol 100 2.93 2.92 − 0.3
15.8 15.3 − 3.2
3-O-methyl-dopa 10 2.93 3.11 6.1
15.8 16.7 5.7
Methyldopa 100 2.93 2.89 − 1.4
15.8 16.1 1.9
MDA1 100 2.93 3.37 15.0
15.8 17.1 8.2
HMMA2 100 2.93 3.13 6.8
15.8 16.5 4.4
PMMA3 100 2.93 2.73 − 6.8
15.8 15 − 5.1
(phentermine,MDEA5,amphetamine,MDMA6,MA7) mixture 100 2.93 2.85 − 2.7
15.8 16.2 2.5
(ibuprofen, naproxen, cotinine, nicotine, caffeine) mixture 1000 2.93 2.86 − 2.4
15.8 16.1 1.9
Carbamazepine 1000 2.93 2.76 − 5.8
15.8 16.1 1.9
  1. 13,4-Methylenedioxyamphetamine
  2. 24-Hydroxy-3-methoxymethamphetamine
  3. 34-Methoxymethamphetamine
  4. 53,4-Methylenedioxyethylamphetamine
  5. 63,4-Methylenedioxymethpheamphetamine
  6. 7Methamphetamine