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Titolo:
SYSTEM PEAKS IN CAPILLARY ZONE ELECTROPHORESIS .2. EXPERIMENTAL-STUDYOF VACANCY PEAKS
Autore:
DESIDERIO C; FANALI S; GEBAUER P; BOCEK P;
Indirizzi:
ACAD SCI CZECH REPUBL,INST ANALYT CHEM CZ-61142 BRNO CZECH REPUBLIC ACAD SCI CZECH REPUBL,INST ANALYT CHEM CZ-61142 BRNO CZECH REPUBLIC CNR,IST CROMATOG I-00016 MONTEROTONDO ROME ITALY
Titolo Testata:
Journal of chromatography
fascicolo: 1-2, volume: 772, anno: 1997,
pagine: 81 - 89
Fonte:
ISI
Lingua:
ENG
Keywords:
SYSTEM PEAKS; VACANCY ELECTROPHORESIS; ORGANIC ACIDS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
9
Recensione:
Indirizzi per estratti:
Citazione:
C. Desiderio et al., "SYSTEM PEAKS IN CAPILLARY ZONE ELECTROPHORESIS .2. EXPERIMENTAL-STUDYOF VACANCY PEAKS", Journal of chromatography, 772(1-2), 1997, pp. 81-89

Abstract

An uncoated capillary with selected background electrolytes (BGEs) was used to study the migrating vacancies of UV-absorbing components of the buffer. Picric and salicylic acids were chosen as the UV-absorbinganionic species, to be used either as samples in normal capillary electrophoresis (CE) mode (direct CE) or as BGE components (reverse CE). To study the effect of BGE composition, 2-morpholinoethanesulfonic acid and monochloroacetate, with lower and higher mobilities, respectively, were selected as two different BGE co-ions of picrate and salicylate. In normal CE mode, anionic species provided tailing or fronting peaks (representing fronting or tailing migrating zones), depending on whether their effective mobilities were lower or higher than the mobility of the BGE co-ion, respectively. In reverse CE, the effect was the opposite. Picrate and salicylate vacancies were represented by frontingor tailing dips (migrating as tailing or fronting zones) when their mobilities were higher or lower than that of the BGE co-ion, respectively. The electroosmotic peak may be negative or positive, according to the original value of the Kohlrausch regulating function of the sample. Finally, the difference between migrating vacancies and indirect detection is demonstrated and explained, showing indirect detection of a mixture of potassium and sodium acetate detected simultaneously with abenzoic acid vacancy.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/07/20 alle ore 05:54:13