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• W2037735331 abstract "Under appropriate conditions, polyelectrolytes separate according to molecular weight during their electrophoretic migration through a dilute solution of inert neutral polymers. These separations facilitate a new capillary electrophoresis-based approach for high resolution and high throughput polyelectrolyte molecular weight analysis, one theoretically applicable to both polyanions and polycations. Although pioneered for DNA, a polyanion, the new method is discussed here in the context of synthetic polycations. Numerous experimental difficulties evolve from the introduction of positive solute charge, not the least of which is a strong tendency for solute adsorption on the negative capillary walls. The adsorption can be overcome by using a run buffer with a cationic surfactant that forms a dynamic yet stable positive wall coating. Feasible at nearly any pH, the surfactant approach enables robust and high-resolution polycation analysis. For illustration, we compare the separation at low pH of three protonated poly(2-vinylpyridine)s to the separation at neutral pH of the same polymers after quaternization. A good match is found. Further, electrophoretic analyses by the new method suggest how poly(2-vinylpyridine)s degrade/crosslink when exposed to quaternizing conditions for an excessive period." @default.
• W2037735331 created "2016-06-24" @default.
• W2037735331 creator A5014025999 @default.
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• W2037735331 date "2001-06-01" @default.
• W2037735331 modified "2023-09-26" @default.
• W2037735331 title "Molecular weight analysis of polycations by capillary electrophoresis in a solution of neutral polymers" @default.
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• W2037735331 doi "https://doi.org/10.1016/s0032-3861(00)00908-3" @default.
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