2000
DOI: 10.1016/s0731-7085(00)00234-x
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The analysis of basic and acidic compounds using non-aqueous CE and non-aqueous CE-MS

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Cited by 33 publications
(15 citation statements)
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“…Recent developments in MS have resulted in improvement in sensitivity that makes MS a suitable detector for CE. Its coupling to MS has been employed for the analyses of basic and acidic compounds in pharmaceutical preparations [12][13][14] and for the analyses of peptides [15,16]. This paper describes a new, superior, and reproducible CE-MS method for the screening and confirmation of eight quaternary ammonium drugs ( Fig.…”
Section: Introductionmentioning
confidence: 99%
“…Recent developments in MS have resulted in improvement in sensitivity that makes MS a suitable detector for CE. Its coupling to MS has been employed for the analyses of basic and acidic compounds in pharmaceutical preparations [12][13][14] and for the analyses of peptides [15,16]. This paper describes a new, superior, and reproducible CE-MS method for the screening and confirmation of eight quaternary ammonium drugs ( Fig.…”
Section: Introductionmentioning
confidence: 99%
“…Lu et al [96] demonstrated that even the addition of the ion-suppressing surfactant SDS to a methanolic buffer improved resolution and sensitivity in a separation and identification of tamoxifen from its metabolites compared to separations in aqueous buffers. Yang et al [98], tricyclic antidepressants [99], haloacetic acids [100], basic pharmaceuticals and hydrohobic sulfonic acids [101]. All the above applications have in common that the adoption of the EOF in CE (in the range of several nL/min) to the flow required by the spray device to maintain a stable electrospray current (in the range of several mL/min) occurred by the addition of a so-called sheath flow.…”
Section: Nace Coupled To Mass Spectrometrymentioning
confidence: 99%
“…Uma das vantagens que estes tipos de eletrólitos oferecem é a formação de um spray estável e compatível com o sistema MS. 26,27 Este fenômeno ocorre principalmente ao se utilizar capilares com revestimento polimérico interno e eletrólitos contendo modificadores orgânicos (como formamida, metanol e acetonitrila), em análises de proteínas e peptídeos. [28][29][30] Outros modos de separação que empregam eletrólitos mais elaborados, como isotacoforese capilar transiente (t-CITP -transient capillary isotacophoresis), focalização isoelétrica capilar (CIEFcapillary isoeletric focusing) e cromatografia eletrocinética micelar (MEKC -micellar electrokinetic chromatography), também podem ser utilizados. [31][32][33][34] Nestes casos, para evitar a contaminação do detector pelos componentes não voláteis do eletrólito (tensoativos, ciclodextrinas, etc), uma alternativa de acoplamento denominada preenchimento parcial (PF -partial filling) foi proposta.…”
Section: Introductionunclassified