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• W2945484575 endingPage "1770" @default.
• W2945484575 startingPage "1762" @default.
• W2945484575 abstract "Abstract This work presents a strategy based on the in‐line coupling of SPE and CE for the chiral determination of cathinones ( R,S ‐mephedrone, R,S ‐4‐methylephedrine, and R,S ‐ methylenedioxypyrovalerone) in urine samples, using a sample pretreatment based on liquid‐liquid extraction. The chiral separation of the compounds is achieved by adding a mixture of 8 mM 2‐hydroxypropil β‐CD and 5 mM β‐CD to the BGE, which consists of 70 mM of monosodium phosphate aqueous solution at pH 2.5. Oasis HLB was the selected sorbent for the in‐line SPE device, and to reduce analysis time and LODs, several parameters affecting the in‐line SPE system were evaluated, such as pressure and time of sample injection and dimensions of the SPE device. The highest preconcentration factors were achieved by using 3 bar of injection pressure for 20 min with an in‐line SPE device of 2 mm length and 150 µm of i.d. The developed method was applied to determine the presence of the compounds in spiked urine samples. The LODs obtained were between 3 and 8 ng/mL, and these levels were below the usual concentrations at which these drugs are present in urine from cathinone abusers. Thus, the optimized method has the potential to be applied for toxicological and forensic purposes." @default.
• W2945484575 created "2019-05-29" @default.
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• W2945484575 date "2019-05-21" @default.
• W2945484575 modified "2023-10-16" @default.
• W2945484575 title "Enantioselective determination of cathinones in urine by high pressure in‐line SPE–CE" @default.
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• W2945484575 doi "https://doi.org/10.1002/elps.201900072" @default.
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