Determination of oxytetracycline and its degradation products by high-performance liquid chromatography-tandem mass spectrometry in manure-containing anaerobic test systems.
This paper describes the development of a HPLC-MS-MS (ESI) method with baseline separation of oxytetracycline, 4-epi-oxytetracycline, alpha-apo-oxytetracycline and beta-apo-oxytetracycline using an XTerra column and an MeOH-MilliQ-water (containing 8 mM formic acid) mobile phase. Limits of quantification for aqueous standards were in the range of 0.004 to 0.008 microM. The linear range tested was 0.003 to 0.5 microM and in one case up to 17 microM. An experiment simulating the degradation of oxytetracycline in manure was set up and free concentrations of the four antibiotics were determined during 6 months. Oxytetracycline (>0.02 microM) was observed up till 6 months after spiking. No important increase in free concentrations of the degradation products was observed.
Loke
Marie Louise
ML
Department of Analytical and Pharmaceutical Chemistry, Royal Danish School of Pharmacy, Universitetsparken 2, 2100, Copenhagen, Denmark. mlc@dfh.dk
Jespersen
Sonja
S
Vreeken
Rob
R
Halling-Sørensen
Bent
B
Tjørnelund
Jette
J
D000693:Anaerobiosis; D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006868:Hydrolysis; D010118:Oxytetracycline / Q000378:metabolism*; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D013552:Swine; D013754:Tetracyclines / Q000378:metabolism*
D013754:Tetracyclines; D010118:Oxytetracycline