Determination of free sulfite in wine by zone electrophoresis with isotachophoresis sample pretreatment on a column-coupling chip

Recent advances in enhancing the sensitivity of electrophoresis and electrochromatography in capillaries and microchips

“…They have presented methods for the separation of enantiomers in biological samples [76][77][78], inorganic ions in water samples [76,79], preservatives in food products [80] in beer and wine [81][82][83] and also in urine [84,85] as well as reports on the separation of proteins [86,87]. In nearly every case, only minimal sample pretreatment was required before analysis, thereby making these rapid and simple methods very attractive for routine analysis.…”

Recent advances in the application of capillary electromigration methods for food analysis

“…This idea can be easily understood considering the example of microchips and their recent applications in food analysis [98,[175][176][177][178][179][180][181][182][183][184][185] (see Table 4). Thus, as can be deduced from Table 4, microchips have already been applied in food analysis to differentiate species [175], to detect food spoilage bacteria [98], to detect GMOs [176,184], and to analyze small organic and inorganic compounds such as amino acids, sugars, etc [177][178][179][180][181][182][183]. Moreover, different detection schemes have been developed to be used together with microchips including LIF [98,175,176,184], conductivity [178][179][180][181], amperometric [182,183] and MS detectors [186].…”

“…Thus, as can be deduced from Table 4, microchips have already been applied in food analysis to differentiate species [175], to detect food spoilage bacteria [98], to detect GMOs [176,184], and to analyze small organic and inorganic compounds such as amino acids, sugars, etc [177][178][179][180][181][182][183]. Moreover, different detection schemes have been developed to be used together with microchips including LIF [98,175,176,184], conductivity [178][179][180][181], amperometric [182,183] and MS detectors [186]. This will make possible to address and solve an even wider number of problems in food science.…”

Capillary electrophoresis of inorganic ions: An update

“…Precolumn conversion into stable heteropolyanions, possessing high molar absorptivities in the UV region, can be exploited to detect As(V) [174], simultaneously As(V) and P(V) [200] or Sb(III) and Bi(III) [201] with sub-mM sensitivities. Masár et al [178] used formaldehyde to convert sulfite into hydroxymethanesulfonate, a more stable in a CE system constituent, whereas Jankovskiene and Padarauskas [202] separated and determined the same analyte in the form of Fe(phen) 3 21 (after derivatization with Fe(III)-phen complex). Hydroxyl radical (OH ?…”

“…These merits of the ITP-ZE coupling were demonstrated for an on-chip analysis of the real-world sample with disparate levels of analytes [163,178]. An interesting procedure to monitor changes in electroosmotic flow (EOF) occurring during a field-amplified sample injection (FASI) experiment was developed [179].…”