Bovine urine was centrifuged.Added the internal standard(ZER-d4 and DES-d8) into the supernate.The extract was cleaned up by two immunoaffinity columns respectively.A C8 analytical column was used and the analytes wer...Bovine urine was centrifuged.Added the internal standard(ZER-d4 and DES-d8) into the supernate.The extract was cleaned up by two immunoaffinity columns respectively.A C8 analytical column was used and the analytes were chromatographed by acetonitrile-water(70:30,v/v).With HPLC-MS/MS,data acquisition was achieved by using atmospheric pressure chemical ionization (APCI) in negative scan mode and multiple reaction monitoring (MRM) determination mode.Quantification was made by internal standarad method.The limits of determination of DES and DEN are 0.05 ng·g-1,the recovery level was 80 %-106% between 0.5 and 10 ng·g-1.The limits of determination of HEX and ZER are 0.025 ng·g-1,the recovery level was 83%-104% between 0.25 and 5 ng·g-1.展开更多
In this paper a method for simultaneous determination of 6 antioxidants (PG,TBHQ,BHA,OG,DG and NDGA) in animal feed by HPLC-MS/MS was described.The samples were extracted by acetonitrile and cleaned up with auto solid...In this paper a method for simultaneous determination of 6 antioxidants (PG,TBHQ,BHA,OG,DG and NDGA) in animal feed by HPLC-MS/MS was described.The samples were extracted by acetonitrile and cleaned up with auto solid phase extraction.The samples were separated by HPLC with a C8 column.The electrospray (ESI) negative mode detected by MRM is used for MS/MS.The detection limits were 2 mg/kg,recoveries and RSDs were 84%-106% and 3.0%-9.0% at this concentration respectively.The method was highly efficient and sensitive,stable and precise.展开更多
文摘Bovine urine was centrifuged.Added the internal standard(ZER-d4 and DES-d8) into the supernate.The extract was cleaned up by two immunoaffinity columns respectively.A C8 analytical column was used and the analytes were chromatographed by acetonitrile-water(70:30,v/v).With HPLC-MS/MS,data acquisition was achieved by using atmospheric pressure chemical ionization (APCI) in negative scan mode and multiple reaction monitoring (MRM) determination mode.Quantification was made by internal standarad method.The limits of determination of DES and DEN are 0.05 ng·g-1,the recovery level was 80 %-106% between 0.5 and 10 ng·g-1.The limits of determination of HEX and ZER are 0.025 ng·g-1,the recovery level was 83%-104% between 0.25 and 5 ng·g-1.
文摘In this paper a method for simultaneous determination of 6 antioxidants (PG,TBHQ,BHA,OG,DG and NDGA) in animal feed by HPLC-MS/MS was described.The samples were extracted by acetonitrile and cleaned up with auto solid phase extraction.The samples were separated by HPLC with a C8 column.The electrospray (ESI) negative mode detected by MRM is used for MS/MS.The detection limits were 2 mg/kg,recoveries and RSDs were 84%-106% and 3.0%-9.0% at this concentration respectively.The method was highly efficient and sensitive,stable and precise.
