Preparation and application of trimethylamine amination polychloromethyl styrene nanolatex coated capillary column for the determination of bromate by field-amplified sample stacking open-tubular capillary electrochromatography

2013 ◽  
Vol 34 (9-10) ◽  
pp. 1312-1318 ◽  
Author(s):  
Yaxiao Guo ◽  
Feifei Xu ◽  
Lei Meng ◽  
Wei Tang ◽  
Yan Xia ◽  
...  
Keyword(s):  
Capillary Electrochromatography ◽  
Capillary Column ◽  
Sample Stacking

scholarly journals Determination of parabens in sweeteners by capillary electrochromatography

2011 ◽  
Vol 47 (4) ◽  
pp. 779-785 ◽  
Author(s):  
Carla Beatriz Grespan Bottoli ◽  
María de Jesús Santa Gutiérrez-Ponce ◽  
Valeska Soares Aguiar ◽  
Walkyria Moraes de Aquino
Keyword(s):  
Capillary Electrochromatography ◽  
Mobile Phase ◽  
Capillary Column ◽  
Direct Injection ◽  
Retention Behavior ◽  
Mobile Phase Composition ◽  
Food Preservatives ◽  
Optimal Separation ◽  
Separation Phase

Parabens, common food preservatives, were analysed by capillary electrochromatography, using a commercial C18 silica (3 µm, 40 cm × 100 µm i. d.) capillary column as separation phase. In order to optimise the separation of these preservatives, the effects of mobile phase composition on the separation were evaluated, as well as the applied voltage and injection conditions. The retention behavior of these analytes was strongly influenced by the level of acetonitrile in the mobile phase. An optimal separation of the parabens was obtained within 18.5 minutes with a pH 8.0 mobile phase composed of 50:50 v/v tris(hydroxymethyl)aminomethane buffer and acetonitrile. The method was successfully applied to the quantitative analysis of paraben preservatives in sweetener samples with direct injection.

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