Polysaccharides electrophoresis

Nagai, K., Yolsukura, N., Ikegami, H., Kimura, H., and Morimoto, K. (2008). Protein extraction for 2-DE from the lamina of Ecklonia kuronte (Laminariales) Recalcitrant tissue containing high levels of viscous polysaccharides. Electrophoresis 3,672-681. 

Richmond, M. D. and Yeung, E. S., Development of a laser-excited indirect fluorescence detection for high-molecular weight polysaccharides in capillary electrophoresis, Anal. Biochem., 210, 245, 1993. 

In the previously described electrophoretic methods, the capillary was filled with electrolytes only. Another mode of operation in capillary electrophoresis involves filling the capillary with gel or viscous polymer solutions. If desired, a column can be packed with particles and equipped with a frit.68 This mode of analysis has been favorably used for the size determination of biologically important polymers, such as DNA, proteins, and polysaccharides. The most frequently used polymers in capillary gel electrophoresis are cross-linked or linear polyacrylamide,69 cellulose derivatives,70-75 agarose,76 78 and polyethylene glycols. 

Nishi et al. [110] used dextran and dextrin as chiral selectors in capillary-zone electrophoresis. Polysaccharides such as dextrins, which are mixtures of linear a-(l,4)-linked D-glucose polymers, and dextrans, which are polymers of D-glucose units linked predominantly by a-(l,6) bonds, have been employed as chiral selectors in the capillary electrophoretic separation of enantiomers. Because these polymers are electrically neutral, the method is applicable to ionic compounds. The enantiomers of basic or cationic drugs such as primaquine were successfully separated under acidic conditions. The effects of molecular mass and polysaccharide concentration on enantioselectivity were investigated. 

Mangelings, D., Hardies, N., Maftouh, M., Suteu, C., Massart, D.L., Vander Heyden, Y. Enantioseparations of basic and bifunctional compounds by capillary electrochromatography using polysaccharide stationary phases. Electrophoresis 2003, 24, 2567-2576. 

H Nishi. Enantiomer separation of basic drugs by capillary electrophoresis using ionic and neutral polysaccharides as chiral selectors. J Chromatogr A 735 345-351, 1996. 

VII. APPLICATIONS OF AFFINITY CAPILLARY ELECTROPHORESIS IN STUDYING POLYSACCHARIDE-PROTEIN INTERACTIONS... 

H Nishi. Enantioselectivity in chiral capillary electrophoresis with polysaccharides. J Chromatogr A 792 327-347, 1997. 

RMC Sutton, KL Sutton, AM Stalcup. Chiral capillary electrophoresis with noncyclic oligo- and polysaccharide chiral selectors. Electrophoresis 18 2297-2304, 1997. 

Gel Electrophoresis. This is becoming a more commonly used procedure for purifying proteins, nucleic acids, nucleoproteins, polysaccharides and carbohydrates. The gels can be electroblotted onto membranes and the modem procedures of identifying, sequencing (proteins and nucleic acids) and amplifying (nucleic acids) on sub-micro scales have made this technique of separation a very important one. (See D.Patel Gel Electrophoresis, J.Wiley-Lis, Inc., 1994). 

Zone electrophoresis is mostly used for biological applications. Peptide separation and the measurement of protein fractions from blood serum (proteinogram of albumin and o-, (3- and 7-globulins) are among the better known applications. This TLC for biochemists is useful for the separation of polysaccharides, nucleic acids (for DNA sequencing), proteins and other colloidal species. 

In contrast, CSPs have achieved great repute in the chiral separation of enantiomers by chromatography and, today, are the tools of the choice of almost all analytical, biochemical, pharmaceutical, and pharmacological institutions and industries. The most important and useful CSPs are available in the form of open and tubular columns. However, some chiral capillaries and thin layer plates are also available for use in capillary electrophoresis and thin-layer chromatography. The chiral columns and capillaries are packed with several chiral selectors such as polysaccharides, cyclodextrins, antibiotics, Pirkle type, ligand exchangers, and crown ethers. 

The chiral recognition mechanisms in NLC and NCE devices are similar to conventional liquid chromatography and capillary electrophoresis with chiral mobile phase additives. It is important to note here that, to date, no chiral stationary phase has been developed in microfluidic devices. As discussed above polysaccharides, cyclodextrins, macrocyclic glycopeptide antibiotics, proteins, crown ethers, ligand exchangers, and Pirkle s type molecules are the most commonly used chiral selectors. These compounds... 

The development of electrophoretic techniques afforded possibilities for fractionations based on charge density differences. Duxbury (1989) has reviewed applications of different electrophoretic separation methods, including zone electrophoresis, moving boundary electrophoresis, isotachophoresis, and isoelectric focusing (IEF). Preparative column electrophoresis (Clapp, 1957) and continuous flow paper electrophoresis (Hayes, 1960 summarized by Hayes et al., 1985) methods have been used to separate components isolated from sapric histosol soils. These techniques allowed separation of polysaccharides from the colored components the electrophoretograms of the colored components were diffuse, showing a continuum of components of different charge densities. 

Given the charge, polysaccharide polyanions are electrically conducting in sols and gels, and move in an electrical field (electrophoresis) in compliance with the equation... 

T 0 is the solvent viscosity, II is the electrophoretic mobility, small for macroions relative to microions, and (j is the applied electromotive force across x. Neutral polysaccharides do not migrate in an electrical field, except as a moiety of an ionic complex or when they adsorb ions. Electrophoresis is a useful method for studying heterogeneity (Aspinall and Cottrell, 1970). 

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