A Study on the Analysis of Methylprednisolone Acetate and its Metabolites in Rat Urine by LC/MS

LC/MS를 이용한 뇨중에서의 Methylprednisolone Acetate 및 그 대사물질 분석에 관한 연구

  • Received : 1995.01.23
  • Published : 1995.06.25


Positive ion mass spectra of some corticosteroids were obtained by using liquid chromatography-mass spectrometry(LC-MS). The base peak of each compound showed the protonated molecular ion [$MH^+$], ammonium adduct ion [${MNH_4}^+$] or [$MH^+-60$] ion according to its chemical structure and other characteristic mass ions were [$MH^+-18$], [${MNH_4}^+-18$] and so on. Several rat urinary metabolites of methylprednisolone acetate after the oral administration were detected by the thermospray LC-MS. The identified major metabolites were 20-hydroxymethylprednisolone(20-HMP), methylprednisolone(MP) and methylprednisone(11-KMP), which were supposed to be formed by deacetylation at the position of C-21, reduction at C-20, oxidation at C-11, or due to the bond cleavage between C-17 and C-20.


Methylprednisolone acetate;Metabolites Analysis;LC/MS;Rat urine