Analytical and Bioanalytical Chemistry

, Volume 402, Issue 5, pp 1931–1939

Development of a UHPLC-MS/MS method for the measurement of chlortetracycline degradation in swine manure

Original Paper

DOI: 10.1007/s00216-011-5637-4

Cite this article as:
Shelver, W.L. & Varel, V.H. Anal Bioanal Chem (2012) 402: 1931. doi:10.1007/s00216-011-5637-4

Abstract

An ultra-high-performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) method was developed capable of simultaneously measuring chlortetracycline (CTC), epi-chlortetracycline, and isochlortetracycline (ICTC), as well as other structurally related tetracyclines in swine manure. A simple sample preparation was used consisting of extraction, dilution, centrifugation, and ultrafiltration. The concentrations of analyte were calculated using d6-tetracycline as an internal standard in the matrix-matched standard curve. A solvent gradient resolved the compounds in 3.5 min with an additional 1.5 min of re-equilibration allowing the analyses of a large number of samples in a short period of time. MS/MS was used as the detection method giving analyte confirmation in addition to a large dynamic range and low detection limit. The UHPLC-MS/MS method successfully resolved multiple degradation products of CTC from the complex manure matrix. The method detection limits ranged from 1.9 pg/μL for CTC to 7.3 pg/μL for ICTC, and the calibration curve was linear from 1 to 10,000 pg/μL. The method was tested by measuring CTC and its degradation products as a function of time in incurred swine manure that had been incubated at three different temperatures (22 °C, 38 °C, and 55 °C). CTC concentration at 22 °C decreased 44% after 25 days; greater percentage decreases were observed when the manure was stored at elevated temperatures (96% and 98% for 38 °C and 55 °C, respectively). The concentration of the microbiologically inactivate isomer, ICTC, increased over the incubation period. At 22 °C, ICTC continued to increase through 25 days of incubation; at 38 °C, ICTC concentration plateaued on day 14 while at 55 °C ICTC concentration plateaued on day 7, with concentration increases of 198%, 374%, and 282% for 22 °C, 38 °C, and 55 °C, respectively.

Figure

Fate of chlortetracycline in swine manure digesters

Keywords

Analysis Measurement Manure treatment Tandem MS 

Copyright information

© Springer-Verlag (outside the USA) 2011

Authors and Affiliations

  1. 1.USDA-Agricultural Research Service, Biosciences Research LaboratoryFargoUSA
  2. 2.USDA-Agricultural Research Service, U.S. Meat Animal Research CenterClay CenterUSA