pharmaceuticals Article Determination of Antidepressants in Human Plasma by Modified Cloud-Point Extraction Coupled with Mass Spectrometry El˙zbietaGniazdowska 1,2 , Natalia Korytowska 3 , Grzegorz Kłudka 3 and Joanna Giebułtowicz 3,* 1 Łukasiewicz Research Network, Industrial Chemistry Institute, 8 Rydygiera, 01-793 Warsaw, Poland;
[email protected] 2 Department of Bioanalysis and Drugs Analysis, Doctoral School, Medical University of Warsaw, 61 Zwirki˙ i Wigury, 02-091 Warsaw, Poland 3 Department of Bioanalysis and Drugs Analysis, Faculty of Pharmacy, Medical University of Warsaw, 1 Banacha, 02-097 Warsaw, Poland;
[email protected] (N.K.);
[email protected] (G.K.) * Correspondence:
[email protected] Received: 5 October 2020; Accepted: 7 December 2020; Published: 12 December 2020 Abstract: Cloud-point extraction (CPE) is rarely combined with liquid chromatography coupled to mass spectrometry (LC–MS) in drug determination due to the matrix effect (ME). However, we have recently shown that ME is not a limiting factor in CPE. Low extraction efficiency may be improved by salt addition, but none of the salts used in CPE are suitable for LC–MS. It is the first time that the influences of a volatile salt—ammonium acetate (AA)—on the CPE extraction efficiency and ME have been studied. Our modification of CPE included also the use of ethanol instead of acetonitrile to reduce the sample viscosity and make the method more environmentally friendly. We developed and validated CPE–LC–MS for the simultaneous determination of 21 antidepressants in plasma that can be useful for clinical and forensic toxicology. The selected parameters included Triton X-114 concentration (1.5 and 6%, w/v), concentration of AA (0, 10, 20 and 30%, w/v), and pH (3.5, 6.8 and 10.2).