Recent trends in the determination of polyphenols by electromigration methods

Optimization of capillary zone electrophoresis separation and on-line preconcentration of 16 phenolic compounds from wines produced in South America

“…Interest in consuming natural products has been growing over the years as a result of indications of their beneficial effects on human health, such as in the prevention of heart disease (Bravo, Silva, Coelho, Vilas Boas, & Bronze, 2006;Frazier, 2001), some types of cancer, and inflammatory processes (Jáč et al, 2006). These effects may be associated with phenolic compounds present in fruits, vegetables, and some of their products, such as teas and wines.…”

“…Moreover, CE presents low consumption of reagents and generates less volume of toxic wastes as compared to other techniques (Frazier, 2001;Fung & Tung, 2001). Capillary zone electrophoresis (CZE) and micellar electrokinetic chromatography (MEKC) have already been used to separate and quantify phenolic compounds (Jáč et al, 2006). In studies carried out by Kanitsar et al (2001), CZE was successfully employed to separate 15 phenolic compounds in citrus (a group of orange and grapefruit samples), with an analysis time of 26 min.…”

“…The main limitation of CE in the analysis of phenolic compounds, as compared to HPLC, is its low sensitivity (Jáč et al, 2006). One of the alternatives is to concentrate the sample using organic solvents by liquid-liquid extraction (LLE) (Bravo et al, 2006;Minussi et al, 2003) or by means of the SPE technique.…”

High performance ion mobility spectrometry as a fast and low cost green analytical technology part I: analysis of nutritional supplements

“…Electrophoresis methods have also been used more recently as well for the flavanoids such as EGCG [27,57]. Under the best conditions, such as with ultra-high pressure liquid chromatography analysis of CoQ10, the elution time is still 4.5 min.…”

Interactions of Proteins with the Acidic Components of the Electrolyte Solution and Their Role in the Performance of Separations by CZE

“…The large selection of compounds that can be employed as additives of the electrolyte solution for this purpose include zwitterions, anionic or cationic ion-pairing agents, complex-forming species, chiral selectors, organic solvents, surfactants, cyclodextrins, denaturing agents, crown ethers, and ionic liquids [4][5][6][7][8][9][10][11]. The related interactions may involve either chiral on non-chiral electrostatic or/and hydrophobic interactions, as well as hydrogen bonding, ion-ion, iondipole, dipole-dipole, and ion-dipole/ion-induced-dipole interactions.…”