- P-ISSN 1225-0163
- E-ISSN 2288-8985
몇 가지 종류의 corticosteroid에 대하여 액체 크로마토그래피-질량분석법으로 양이온 질량 스펙트럼을 얻었다. 화학구조에 따라 수소 첨가된 분자이온 [<TEX>$MH^+$</TEX>], 암모늄 첨가이온 [<TEX>${MNH_4}^+$</TEX>], 또는 (<TEX>$MH^+-60$</TEX>) 이온이 base peak였고 [<TEX>$MH^+-18$</TEX>] 또는 [<TEX>${MNH_4}^+-18$</TEX>] 이온 등이 특성적으로 나타났다. Methylprednisolone acetate를 male Sprague-Dawley rat에 경구투여한 다음 24시간 동안 배설된 뇨로부터 유리상태 또는 접합상태의 대사물질들을 가수분해, 추출 및 농축하고, thermospray LC/MS를 사용하여 양이온과 음이온 질량토막이온을 분석하였다. Methylprednisolone acetate의 C-21 위치에서의 탈아세틸화(deacetylation), C-20 위치에서 C
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 [<TEX>$MH^+$</TEX>], ammonium adduct ion [<TEX>${MNH_4}^+$</TEX>] or [<TEX>$MH^+-60$</TEX>] ion according to its chemical structure and other characteristic mass ions were [<TEX>$MH^+-18$</TEX>], [<TEX>${MNH_4}^+-18$</TEX>] 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.