High-resolution LC/MS for analysis of minor components in complex mixtures: negative ion ESI for identification of impurities and degradation products of a novel oligosaccharide antibiotic.
J Mass Spectrom
; 35(11): 1252-8, 2000 Nov.
Article
em En
| MEDLINE
| ID: mdl-11114082
ABSTRACT
High-resolution mass spectrometry has been routinely used for structural confirmation and identification; however, it has mostly been applied to relatively pure samples. Exact mass measurement of minor components such as impurities, degradation products or metabolites in complex mixtures has been difficult without prior separation and isolation. Here we report the utilization of on-line liquid chromatography in combination with high-resolution mass spectrometry for the identification of impurities and base degradation products of Sch 27899, a member of the everninomicin class of antibiotics. Nine Sch 27899-related impurities and degradation products were detected by negative ion electrospray ionization using a magnetic sector mass spectrometer. Exact mass measurements were obtained at a resolution of 5000 using polyethylene glycol (PEG) sulfates as internal standards. Corresponding elemental compositions were determined within a 2 ppm error tolerance and structures were proposed for all components.
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Base de dados:
MEDLINE
Assunto principal:
Oligossacarídeos
/
Cromatografia Líquida
/
Espectrometria de Massas por Ionização por Electrospray
/
Aminoglicosídeos
/
Antibacterianos
Tipo de estudo:
Diagnostic_studies
Idioma:
En
Revista:
J Mass Spectrom
Ano de publicação:
2000
Tipo de documento:
Article
País de afiliação:
Estados Unidos