Stability of synthetic cathinones in blood and urine ...
2019-2-1 · A methanolic solution of mephedrone-D 3 was added as an internal standard (IS) to the blood and urine samples (0.2 mL) in Eppendorf vials before each analysis, in order to obtain a concentration of 100 ng/mL. Then, 200 μL 0.5 M carbonate buffer (pH 12) and 1 mL n-butyl chloride were added.
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