Merck

Adulteration of urine by "Urine Luck".

Clinical chemistry (1999-07-01)
A H Wu, B Bristol, K Sexton, G Cassella-McLane, V Holtman, D W Hill
RESUMEN

In vitro adulterants are used to invalidate assays for urine drugs of abuse. The present study examined the effect of pyridinium chlorochromate (PCC) found in the product "Urine Luck". PCC was prepared and added to positive urine controls at concentrations of 0, 10, 50, and 100 g/L. The controls were assayed for methamphetamine, benzoylecgonine (BE), codeine and morphine, tetrahydrocannabinol (THC), and phencyclidine (PCP) with the Emit II (Syva) and Abuscreen Online (Roche) immunoassays, and by gas chromatography/mass spectrometry (GC/MS). Two tests were also developed to detect PCC in urine: a spot test to detect chromate ions using 10 g/L 1,5-diphenylcarbazide as the indicator, and a GC/MS assay for pyridine. We tested 150 samples submitted for routine urinalysis, compliance, and workplace drug testing for PCC, using these assays. Response rates decreased at 100 g/L PCC for all Emit II drug assays and for the Abuscreen morphine and THC assays. In contrast, the Abuscreen amphetamine assay produced apparently higher results, and no effect was seen on the results for BE or PCP. The PCC did not affect the GC/MS recovery of methamphetamine, BE, PCP, or their deuterated internal standards, but decreased GC/MS recovery of the opiates at both intermediate (50 g/L) and high (100 g/L) PCC concentrations and apparent concentrations of THC and THC-d3 at all PCC concentrations. Two of 50 samples submitted for workplace drug testing under chain-of-custody conditions were positive for PCC, whereas none of the remaining 100 specimens submitted for routine urinalysis or compliance drug testing were positive. PCC is an effective adulterant for urine drug testing of THC and opiates. Identification of PCC use can be accomplished with use of a spot test for the oxidant.

MATERIALES
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Supelco
Pyridine solution, certified reference material, 2000 μg/mL in methanol
Sigma-Aldrich
Pyridinium chlorochromate, 98%
Sigma-Aldrich
Pyridine, ≥99%
Sigma-Aldrich
Pyridine, anhydrous, 99.8%
Supelco
Pyridine, analytical standard
Sigma-Aldrich
Pyridine, ReagentPlus®, ≥99%
Sigma-Aldrich
Pyridine, ReagentPlus®, ≥99%
Sigma-Aldrich
Pyridine, ACS reagent, ≥99.0%
Sigma-Aldrich
Pyridine, suitable for HPLC, ≥99.9%
Sigma-Aldrich
Pyridine, ACS reagent, ≥99.0%
Sigma-Aldrich
Pyridine, biotech. grade, ≥99.9%
Sigma-Aldrich
Pyridine, puriss. p.a., ACS reagent, reag. Ph. Eur., ≥99.5% (GC)