Fig. 5From: Mixed mode monolithic sorbent in pipette tip for extraction of ractopamine and clenbuterol prior to analysis by HPLC-UV and UHPLC-Q ExactiveTM Plus Orbitrap MSRepresentative chromatograms and mass spectra of standard solution, blank, and spiked pooled swine urines containing 64 ng mL−1 RAC and 67 ng mL−1 CLEN extracted by the IT monolithic μ-SPE with UHPLC-Q ExactiveTM Plus Orbitrap HRMS analysisBack to article page