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- W2153124995 abstract "A systematic investigation has been made into the mechanisms of the capillary zone electrophoresis (CZE) separation of 12 common nucleotides (mono-, di- and triphosphorylated) and polydeoxythymidylic acid oligonucleotides (pd(T)5-18) using electrophoretic mobility values calculated from migration time data. Relationships between electrophoretic mobility and the physicochemical characteristics of the analytes (charge, dissociation constants, charge-to-mass ratio) and the background electrolyte conditions (buffer strength, percentage organic modifier and buffer pH) were characterised. Nucleotide migration was dominated by the negatively charged phosphate groups. Additionally, there were important contributions to migration behaviour from the ionised amide groups of the nucleobases guanine and uracil at higher buffer pH values or with the presence of methanol in the electrolyte. Calculated electrophoretic mobility values for the nucleotides showed a substantially improved (5-fold) inter-run repeatability compared with migration time data. These studies show the value of representing nucleotide migration data as electrophoretic mobility in CZE for obtaining a more thorough analysis of separation mechanisms and to compensate for variation in migration time data caused by small changes in electrosmotic flow. Oligonucleotides pd(T)5-11 could be adequately resolved from their nearest neighbour, but the limit of single-base separation was pd(T)10 from pd(T)11 under the conditions used. It was calculated that a difference in charge-to-mass ratio of 2.64 x 10(-5) was required for resolution under the CZE conditions used." @default.
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- W2153124995 date "2001-04-01" @default.
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- W2153124995 title "Electrophoretic behaviour of oligonucleotides and mono-, di- and triphosphate nucleotides by capillary zone electrophoresis" @default.
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- W2153124995 doi "https://doi.org/10.1002/1522-2683()22:6<1119::aid-elps1119>3.0.co;2-x" @default.
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