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- W2013263113 abstract "Immobilized pH gradients use a series of weak acrylamido acids and bases (Immobiline) to create a pH gradient along the separation axis. These buffers can be degraded in water by two mechanisms: (i) hydrolysis of the amido bond, with generation of free acrylic acid and either an amino acid or a diamine; (ii) autopolymerization to oligomers and/or n-mers. In order to check for these degradation products, different capillary zone electrophoresis systems for analysis of all Immobilines have been devised. The acidic compounds are resolved in 100 mM acetate, pH 4.0, whereas the alkaline Immobilines are separated in 50 mM phosphate buffer, pH 7.7 (or pH 7.2 for the weaker species). Polymers of alkaline Immobilines are resolved in 50 mM phosphate buffer, pH 2.5, in 1% Ficoll-400. All Immobilines are detected underivatized, by their adsorption at 214 or 254 nm. A calibration curve has been constructed for quantification of acrylic acid contamination. As little as 1 mol% of acrylic acid contamination in Immobiline solutions can be detected, with a sensitivity limit below 0.2 mM (at the injection port)." @default.
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- W2013263113 date "1991-01-01" @default.
- W2013263113 modified "2023-09-25" @default.
- W2013263113 title "Analysis of acrylamido-buffers for isoelectric focusing by capillary zone electrophoresis" @default.
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- W2013263113 doi "https://doi.org/10.1002/elps.1150120110" @default.
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