Fig. 4From: 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 of 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 HPLC-UV analysis. See caption of Fig. 2 for HPLC conditionsBack to article page