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. 2023 Jul 17;2023:9895595. doi: 10.1155/2023/9895595

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Copyright © 2023 Feng-Shuo Yang et al.

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Comparison of the stability of the analytes in urine at different temperatures. Stability of the 10 analytes in urine at (a) frozen temperature (−20°C), (b) refrigerated temperature (4°C), and (c) room temperature (25°C). The targeted concentrations for mephedrone, butylone, pentylone, eutylone, ephylone, 4-MEAPP, PMA, and PMMA are 50 ng/mL. The targeted concentrations for DCK and 2-FDCK are 25 ng/mL. Mephedrone: 4-methylmethcathinone; ephylone: N-ethylpentylone; 4-MEAPP: 4-methyl-α-ethylaminopentiophenone; PMA: para-methoxyamphetamine; PMMA: para-methoxymethamphetamine; DCK: deschloroketamine; 2-FDCK: 2-fluorodeschloroketamine.