title: Analysis of sub μg/kg lincomycin in honey, muscle, milk, and eggs using fast liquid chromatography-tandem mass spectrometry.
abstract: A fast liquid chromatography-tandem mass spectrometry (LC-MS-MS) method is developed to determine lincomycin (LM) in honey, muscle, milk, and egg. Samples are cleaned-up at pH 4.7 using Strata-X-C mixed-mode polymeric strong cation exchange solid-phase extraction (SPE) cartridges, which could selectively adsorb the lincomycin from matrices under the acidic condition. LM is separated on the recently introduced Kinetex XB core-shell type HPLC column using isocratic elution mode with a mobile phase containing 0.1% formic acid in water/acetonitrile (93/7, v/v, pH 2.6) at a flow rate of 0.7 mL/min. The subsequent MS/MS detection has decreased ion effect, which allows the limit of detection (LOD) of LM for honey to be 0.05 µg/kg for honey and 0.5 µg/kg for muscle, milk, and egg. These LODs are much lower than those reported previously. The other main advantage of the developed method is the analysis time of only 3.5 min, which is about three times shorter than other reported LC-MS-MS methods. Recoveries varies between 94.2% and 125.2% and in-house reproducibility ranges from 3.7% to 28.7%. The developed method is validated according to European Union (EU) Commission Decision 2002/657/EC using a matrix-comprehensive validation strategy. All studied analytical parameters fulfills the EU guidelines.
authors.affiliation: Central Agricultural Office Food and Feed Safety Directorate, Food Toxicology National Reference Laboratory, Budapest, Hungary.
authors.forename: Adám
authors.initials: A
authors.lastname: Tölgyesi
authors.forename: Jenõ
authors.initials: J
authors.lastname: Fekete
authors.forename: Szabolcs
authors.initials: S
authors.lastname: Fekete
authors.forename: Virender K
authors.initials: VK
authors.lastname: Sharma
authors.forename: Katalin
authors.initials: K
authors.lastname: Békési
authors.forename: Edina
authors.initials: E
authors.lastname: Tóth
mesh_terms: D000818:Animals; D002853:Chromatography, Liquid / Q000379:methods*; D004350:Drug Residues / Q000032:analysis*; D004531:Eggs / Q000032:analysis; D005504:Food Analysis / Q000379:methods*; D006722:Honey / Q000032:analysis; D057230:Limit of Detection; D008034:Lincomycin / Q000032:analysis*; D016014:Linear Models; D008460:Meat / Q000032:analysis; D008892:Milk / Q000737:chemistry; D015203:Reproducibility of Results; D052616:Solid Phase Extraction; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D008034:Lincomycin