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Mass spectrometric analysis of epimeric 3α/3β functionalized steroids.
Ramos, Susana Sofia; Ramalho, Luís; Costa, Mafalda; Teixeira, Adriano; Almeida, Paulo; Costa, Maria do CéuTandem mass spectrometry (MS/MS) using an atmospheric pressure chemical ionization (APCI) source in positive mode (+) reveals different intensity ratios of two fragment peaks of the epimeric cholestane derivatives synthesized from 3{460}- or 3β-cholestanol. The investigation of the fragmentation pattern obtained from their full scan and/or collision induced dissociation (CID) spectra in the case of the cholesta...
Síntese e avaliação biológica de novas saponinas imunoactivas=
Costa, Maria do Céu; Eleutério, I.; Ramos, Susana Sofia; Alves, Susana; Cardoso, F. H.; Ley, S.; Schmidt, R. R.QS21 is a natural saponin extracted with water from the bark of endemic trees of South America which has been shown to play a key role as vaccine adjuvant. The aim of this study was to determine if simpler synthetic analogues of QS-21 could induce similar advantageous immune responses. For this purpose we designed and synthesized both the cholestanyl- and amirinyl-3-β-O-(β-D-xylopyranosyl)-(1 →3)-[(β-D-galactop...
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