2008 Volume 49 Issue 3 Pages 239-243
A simple and rapid LC/MS method for simultaneous determination of sedecamyin (SCM) and terdecamycin (TDM) in livestock products has been developed. SCM and TDM were extracted with acetonitrile. The extract was washed with n-hexane and then evaporated to dryness. The residue was dissolved in methanol, and injected into the LC/MS. The mass spectrometer was operated in the positive electrospray ionization (ESI) mode. LC separation was performed on a high-pH-resistant C18 column with 10 mmol/L carbonic acid-ammonia buffer (pH 10.0)-acetonitrile as a mobile pahse. The recoveries from swine muscle and liver fortified at the levels of 0.01 and 0.05 μg/g were 77-88%, and those from poultry muscle and liver fortified at the levels of 0.01 and 0.3 μg/g were 51-93%. The quantitation limits of SCM and TDM were 0.008 μg/g and 0.005 μg/g, respectively.
